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Combining Ability Analyses of Net Photosynthesis Rate in Pepper (Capsicum annuum L.) 被引量:4
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作者 ZOU Xue-xiao MA Yan-qing +5 位作者 LIU Rong-yun ZHANG Zhu-qing CHENG Wen-chao DAI Xiong-ze LI Xue-feng ZHOU Qun-chu 《Agricultural Sciences in China》 CAS CSCD 2007年第2期159-166,共8页
In perspective of breeding high-yield hybrid pepper varieties, combining ability analysis of net photosynthesis rate at different phases of flowering and fruit setting in pepper was made with 15 cross combinations fro... In perspective of breeding high-yield hybrid pepper varieties, combining ability analysis of net photosynthesis rate at different phases of flowering and fruit setting in pepper was made with 15 cross combinations from 6 parents by (1/2) n (n- 1) diallel crosses. There are relatively large differences not only in general combining ability (GCA) effect among different parents and at different phases of flowering and fruit setting, but also in specific combining ability (SCA) effect among different hybrids. There are relatively large GCA effects in late parents but relatively less GCA effects in early parents. No obvious laws have been found in the relationship between SCA effects and maturity of hybrids. Variances of SCA are larger than those of GCA. Heritability is less but influence of environment is larger. Correlation analysis of combining ability between net photosynthesis rate and agronomic character or resistances to main diseases has showed that correlation coefficients of GCA are relatively large at the medium phase and the late phase of flowering and fruit setting. Net photosynthesis rate is more relative to leaf characters and fruit characters. Correlation coefficients of SCA are relatively large at the early phase and the late phase of flowering and fruit setting. Net photosynthesis rate is more relative to leaf characters and plant characters at the early phase but to plant characters and fruit characters at the late phase. Correlation coefficients of SCA between net photosynthesis rate and resistances to main diseases are larger than those of GCA. The combining abilities of net photosynthesis rate at different phases of flowering and fruit setting are positively correlated with those of yield per plant. The combining ability is an important parameter of breeding of high photosynthesis hybrid pepper varieties. 展开更多
关键词 pepper (Capsicum annuum L.) net photosynthesis rate combining ability STABILITY correlation analysis
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Canopy Net Photosynthesis Rate of a Mongolian Oak (<i>Quercus mongolica</i>) Forest Estimated by Field Experimental Data
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作者 Seung Jin Joo Soon-Ung Park 《American Journal of Plant Sciences》 2017年第3期390-411,共22页
The canopy net photosynthesis rate of Mongolian oak (Quercus mongolica) tree species that are dominant in East Asia and Korea is estimated with empirical models derived from field experimental data obtained from the N... The canopy net photosynthesis rate of Mongolian oak (Quercus mongolica) tree species that are dominant in East Asia and Korea is estimated with empirical models derived from field experimental data obtained from the Nam-San site in Seoul, Korea for the growing period from early May to late October in 2010. The empirical models include the attenuation function of photosynthetic photon flux density (PPFD) (r2 = 0.98-0.99, p r2 = 0.99, p < 0.001) derived from the measured data at several levels within the canopy. The incident PPFD at each level within canopy significantly varies diurnally and seasonally due to the seasonal variation of the total plant area index (TPAI = leaf area index + wood silhouette area index) and the light shielding effect of light path-length through the canopy in association with the variation of solar elevation angle. Consequently, a remarkable seasonal variation of the total canopy net photosynthesis rate of Q. mongolica forest stand is found for its growing period. The PPFD exceeding 1000 μmol m-2·s-1 is found to cause the decrease of net photosynthesis rate due to the thermal stress in the early (May) and late (September) growing period. During the whole growing season, the estimated total canopy net photosynthesis rate is found to be about 3.3 kg CO2 m-2. 展开更多
关键词 MONGOLIAN OAK (Quercus mongolica) CANOPY net photosynthesis rate PPFD TPAI Solar Elevation Angle
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Simulating leaf net CO_2 assimilation rate of C_3 & C_4 plants and its response to environmental factors 被引量:1
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作者 张佳华 姚凤梅 《Journal of Forestry Research》 SCIE CAS CSCD 2001年第1期9-12,共5页
Basic structure and algorithm of leaf mechanism photosynthesis model were described in first part of this study based on former researcher results. Then, considering some environmental factors influencing on leaf ph... Basic structure and algorithm of leaf mechanism photosynthesis model were described in first part of this study based on former researcher results. Then, considering some environmental factors influencing on leaf photosynthesis, three numerical sensitivity experiments were carried out. We simulated the sing le leaf net CO2 assimilation, which acts as a function of different light, carbo n dioxide and temperature conditions. The relationships between leaf net photosy nthetic rate of C3 and C4 plant with CO2 concentration intercellular, leaf tempe rature, and photosynthetic active radiation (PAR) were presented, respectively. The results show the numerical experiment may indicate the main characteristic o f plant photosynthesis in C3 and C4 plant, and further can be used to integrate with the regional climate model and act as land surface process scheme, and bett er understand the interaction between vegetation and atmosphere. 展开更多
关键词 photosynthesis model net CO2 assimilation rate C3 and C4 plants Num erical simulation
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Simulating leaf net CO2 assimilation rate of C3 & C4 plants and its response to environmental factors 被引量:1
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作者 张佳华 姚凤梅 《Journal of Forestry Research》 CAS CSCD 2001年第1期9-12,75,共页
Basic structure and algorithm of leaf mechanism photosynthesis model were described in first part of this study based on former researcher results. Then, considering some environmental factors influencing on leaf ph... Basic structure and algorithm of leaf mechanism photosynthesis model were described in first part of this study based on former researcher results. Then, considering some environmental factors influencing on leaf photosynthesis, three numerical sensitivity experiments were carried out. We simulated the sing le leaf net CO2 assimilation, which acts as a function of different light, carbo n dioxide and temperature conditions. The relationships between leaf net photosy nthetic rate of C3 and C4 plant with CO2 concentration intercellular, leaf tempe rature, and photosynthetic active radiation (PAR) were presented, respectively. The results show the numerical experiment may indicate the main characteristic o f plant photosynthesis in C3 and C4 plant, and further can be used to integrate with the regional climate model and act as land surface process scheme, and bett er understand the interaction between vegetation and atmosphere. 展开更多
关键词 photosynthesis model net CO2 assimilation rate C3 and C4 plants Num erical simulation
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SIMPLE SIMULATION OF THE ANNUAL VARIATION OF THE SPECIFIC PHOTOSYNTHESIS RATE IN JIAOZHOU BAY
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作者 任玲 张曼平 +2 位作者 陆贤昆 冯士笮 Uwe.H.Brockmann 《Chinese Journal of Oceanology and Limnology》 SCIE CAS CSCD 2001年第1期63-72,共10页
A simple diagnostic simulation of the annual cycling of the surface specific photosynthesis rate (SPR) in Jiaozhou Bay is described in this paper. Light intensity, temperature and nutrients (nitrate + ammonia, phospha... A simple diagnostic simulation of the annual cycling of the surface specific photosynthesis rate (SPR) in Jiaozhou Bay is described in this paper. Light intensity, temperature and nutrients (nitrate + ammonia, phosphate) were considered as main factors controlling photosynthesis of phytoplankton and were introduced into the model by different function equations. The simulated variation of specific photosynthesis rate coincided with the measured data. Analysis of the effect of every factor on photosynthesis indicated that the variation of photosynthesis rate was controlled by all these three factors, while temperature showed good correlation with SPR as measurement showed. This diagnostic simulation yielded the values of some parameter relating with the photosynthesis in Jiaozhou Bay. 展开更多
关键词 SIMULATION specific photosynthesis rate SURFACE seawater Jiaozhou Bay
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不同氮肥处理对香稻和非香稻品种籽粒灌浆和叶片光合特性的影响
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作者 殷春渊 王书玉 +8 位作者 刘贺梅 孙建权 胡秀明 王和乐 张金霞 张倩倩 田芳慧 彭东 张玉红 《中国农学通报》 2024年第17期8-13,共6页
在大田条件下,通过对香稻和非香稻品种的籽粒灌浆、叶片光合特性进行研究,明确香稻和非香稻品种产量和品质形成的生理机制。结果表明:在籽粒灌浆期,相对于非香稻品种,香稻品种在不施氮处理下表现为较高的籽粒灌浆速率,在施氮处理下表现... 在大田条件下,通过对香稻和非香稻品种的籽粒灌浆、叶片光合特性进行研究,明确香稻和非香稻品种产量和品质形成的生理机制。结果表明:在籽粒灌浆期,相对于非香稻品种,香稻品种在不施氮处理下表现为较高的籽粒灌浆速率,在施氮处理下表现为较低的籽粒灌浆速率;对于剑叶光合速率,无论在施氮还是非施氮条件下均表现为香稻品种高于非香稻品种,说明香稻品种更具有高光效特性。对2品种的产量性状分析表明,香稻品种较非香稻品种粒多,穗大;而非香稻品种相对于香稻品种则穗小,穗数多,这说明,香稻品种主要表现为大穗型,而非香稻品种主要表现为多穗型。对2品种的品质性状进行分析,加工品质2品种差异较小,外观品质表现为非香稻品种明显优于香稻品种,食味值2品种相差相对较小,且均表现为不施氮处理的食味值较高。综合以上分析表明,相对于非香稻品种,香稻品种在不施氮处理下主要表现为较高的籽粒灌浆速率,较高的剑叶光合速率,较高的产量及较高的食味品质;在施氮处理下,除光合速率香稻高于非香稻品种外,其他性状稍低于非香稻品种,这说明,在水稻提优栽培中,在确保产量不降低的情况下,不施或适当少施氮肥,有利于增加香稻品种的籽粒灌浆速率和剑叶光合速率,从而提高香稻的品质。 展开更多
关键词 香稻 非香稻 籽粒灌浆 光合速率 产量 品质
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不同偏置条件下NPN双极晶体管的电离辐照效应 被引量:8
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作者 费武雄 陆妩 +9 位作者 任迪远 郑玉展 王义元 陈睿 王志宽 杨永晖 李茂顺 兰博 崔江维 赵云 《原子能科学技术》 EI CAS CSCD 北大核心 2011年第2期217-222,共6页
对NPN双极晶体管进行了不同剂量率、不同偏置条件下的电离辐射实验。研究结果表明:同一剂量率辐照时,无论是低剂量率还是高剂量率,辐照损伤均是基-射结反向偏置时最大,零偏置次之,正偏置最小。NPN双极晶体管在3种偏置下均可观察到明显... 对NPN双极晶体管进行了不同剂量率、不同偏置条件下的电离辐射实验。研究结果表明:同一剂量率辐照时,无论是低剂量率还是高剂量率,辐照损伤均是基-射结反向偏置时最大,零偏置次之,正偏置最小。NPN双极晶体管在3种偏置下均可观察到明显的低剂量率辐照损伤增强(ELDRS)效应,且偏置条件对ELDRS效应很明显,表现为基-射结正向偏置ELDRS效应最为显著,零偏次之,反向偏置最次。对出现这一实验结果的机理进行了探讨。 展开更多
关键词 npn双极晶体管 60Coγ辐照 偏置 低剂量率辐照损伤增强
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五个杨树品种生长、光合生理及根尖离子流速特性比较分析
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作者 张婧 张伟溪 +5 位作者 丁昌俊 苑正赛 代丽蕊 苏晓华 沈应柏 曲冠证 《植物研究》 CAS CSCD 北大核心 2024年第1期96-106,共11页
通过比较不同品种杨树(Populus)的生长、光合生理及根尖离子流速特性差异,为速生适应性强品种的早期选育提供参考。以渤丰3号杨(P.×euramericana‘Bofeng 3’)、渤丰1号杨(P.×euramericana‘Bofeng 1’)、西雄1号杨(P.×e... 通过比较不同品种杨树(Populus)的生长、光合生理及根尖离子流速特性差异,为速生适应性强品种的早期选育提供参考。以渤丰3号杨(P.×euramericana‘Bofeng 3’)、渤丰1号杨(P.×euramericana‘Bofeng 1’)、西雄1号杨(P.×euramericana‘Xixiong 1’)、中雄7号杨(P.×euramericana‘Zhongxiong 7’)和中雄4号杨(P.deltoides×P.suaveolens cl.‘Zhongxiong 4’)5个杨树品种1年生苗为研究对象,于正常培养条件下的试验开始和试验结束(30 d)时分别测定株高、地径等生长指标,并于10、20、30 d时分别测定幼苗的叶片数量、单叶面积、叶长、叶宽、瞬时净光合速率(P_(n))、胞间CO_(2)摩尔浓度(C_(i))、气孔导度(G_(s))、蒸腾速率(T_(r))、叶绿素相对含量以及根尖K^(+)、Ca^(2+)、H^(+)流速等指标,经过30 d的正常管理,5个品种的株高生长量之间的差异达到显著水平,由高到低依次为中雄4号杨、西雄1号杨、渤丰3号杨、中雄7号杨、渤丰1号杨;其中光合特性指标和蒸腾速率渤丰1号杨均表现为最大,中雄4号杨均表现为最小,但是中雄4号杨的单叶面积((57.49±2.37)cm^(2))、总叶面积((1721.10±28.59)cm^(2))、单株净光合速率((17863.10±910.21)μmol·m-2·s-1)和水分利用率((3.15±0.06)μmol·mmol^(-1))均表现为最大,且K^(+)外排流速最慢,为(62.68±0.45)pmol·cm^(-2)·g^(-1),Ca^(2+)内流流速最快,为(-74.24±1.29)pmol·cm^(-2)·g^(-1),而渤丰1号的单株净光合速率((8539.70±164.64)μmol·m-2·s-1)和水分利用率((2.64±0.07)μmol·mmol^(-1))最小,且K^(+)外排流速((130.81±1.71)pmol·cm^(-2)·g^(-1))最快,Ca^(2+)内流流速((-34.43±0.84)pmol·cm^(-2)·g^(-1))最慢。综上所述,5个杨树品种中,中雄4号杨总叶面积、单株净光合速率、水分利用率最高,蒸腾速率最小,根尖K^(+)外排流速最慢,Ca^(2+)内流流速最快,植物体内K^(+)、Ca^(2+)离子含量最多,H^(+)最活跃,株高生长表现最好,可能具有潜在的较强环境适应能力,适宜种植的范围更广。 展开更多
关键词 杨树品种 生长差异 光合作用 蒸腾作用 根尖离子流速
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不同基区掺杂浓度NPN双极晶体管电离辐照效应 被引量:5
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作者 席善斌 陆妩 +6 位作者 郑玉展 许发月 周东 李明 王飞 王志宽 杨永晖 《原子能科学技术》 EI CAS CSCD 北大核心 2010年第B09期533-537,共5页
对相同工艺制作但基区掺杂浓度不同的国产NPN双极晶体管,在不同剂量率条件下进行60Coγ辐照效应和退火特性研究。结果显示,晶体管基区掺杂浓度不同,对高、低剂量率的辐照响应也不相同,低基区掺杂浓度的晶体管辐照损伤明显高于高基区掺... 对相同工艺制作但基区掺杂浓度不同的国产NPN双极晶体管,在不同剂量率条件下进行60Coγ辐照效应和退火特性研究。结果显示,晶体管基区掺杂浓度不同,对高、低剂量率的辐照响应也不相同,低基区掺杂浓度的晶体管辐照损伤明显高于高基区掺杂浓度的晶体管。 展开更多
关键词 npn双极晶体管 60Co Γ辐照 基区掺杂浓度 低剂量率辐照损伤增强效应
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变温辐照加速评估方法在不同工艺的NPN双极晶体管上的应用 被引量:8
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作者 费武雄 陆妩 +9 位作者 任迪远 郑玉展 王义元 陈睿 李茂顺 兰博 崔江维 赵云 王志宽 杨永晖 《原子能科学技术》 EI CAS CSCD 北大核心 2010年第12期1493-1497,共5页
对6种不同工艺的NPN双极晶体管进行了高、低剂量率及变温辐照的^(60)Coγ辐照实验。结果显示,6种工艺的NPN双极晶体管均有显著的低剂量率辐照损伤增强效应。而变温辐照损伤不仅明显高于室温高剂量率的辐照损伤,且能很好地模拟并保守地... 对6种不同工艺的NPN双极晶体管进行了高、低剂量率及变温辐照的^(60)Coγ辐照实验。结果显示,6种工艺的NPN双极晶体管均有显著的低剂量率辐照损伤增强效应。而变温辐照损伤不仅明显高于室温高剂量率的辐照损伤,且能很好地模拟并保守地评估不同工艺的NPN双极晶体管低剂量率的辐照损伤。对实验现象的机理进行了分析。 展开更多
关键词 npn双极晶体管 ~60Coγ辐照 低剂量率辐照损伤增强 变温辐照 加速评估方法
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不同剂量率下NPN管和NMOSFET管的电离辐照效应 被引量:3
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作者 张华林 任迪远 +1 位作者 陆妩 崔帅 《固体电子学研究与进展》 CAS CSCD 北大核心 2005年第1期29-34,共6页
研究了 NPN双极晶体管和 NMOSFET在不同剂量率环境下的电离辐照效应。研究表明 ,NPN管在低剂量率辐照下 ,电流增益衰降更为显著 ,且具有真正的剂量率效应 ;而 NMOS管在低剂量率辐照下产生的阈电压负向漂移比高剂量率辐照时小 ,其辐照效... 研究了 NPN双极晶体管和 NMOSFET在不同剂量率环境下的电离辐照效应。研究表明 ,NPN管在低剂量率辐照下 ,电流增益衰降更为显著 ,且具有真正的剂量率效应 ;而 NMOS管在低剂量率辐照下产生的阈电压负向漂移比高剂量率辐照时小 ,其辐照效应是时间相关效应 ,而非真正的剂量率效应。 展开更多
关键词 剂量率效应 npn NMOS管 增益 阈电压
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扁核木不同直径茎干的光合生理特征
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作者 张亚萍 杨兆珍 +1 位作者 陈佳福 田斌 《西部林业科学》 CAS 北大核心 2024年第3期154-160,共7页
植物的绿色茎干能在叶片缺失时有效地利用阳光进行光合作用,为植物的生长发育提供额外的能量来源,使其更好地适应极端环境。本研究以分布于西南地区具有绿色茎干的植物——扁核木为对象,比较了扁核木不同直径茎干的光合特性及其与叶绿... 植物的绿色茎干能在叶片缺失时有效地利用阳光进行光合作用,为植物的生长发育提供额外的能量来源,使其更好地适应极端环境。本研究以分布于西南地区具有绿色茎干的植物——扁核木为对象,比较了扁核木不同直径茎干的光合特性及其与叶绿素含量之间的差异,为扁核木的育种和高效栽培提供依据。结果显示:(1)扁核木茎干具有较强的光合能力,且与叶绿素含量存在显著相关性;(2)不同直径的茎干叶绿素含量和光合能力存在差异,随着扁核木茎干直径的增加,叶绿素含量、净光合速率、光补偿点和光饱和点呈现逐渐下降的趋势,但扁核木不同直径的茎干净光合速率均较高。研究表明:茎干的光合作用功能有助于扁核木在早春无叶期间完成开花的生理过程,提高了其对极端环境的适应性。 展开更多
关键词 茎干光合作用 扁核木 叶绿素含量 净光合速率 早春开花
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施氮量对强筋小麦光合、产量、蛋白质含量和加工品质的影响 被引量:2
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作者 王文政 李亚静 +4 位作者 张敏 毕经鑫 杨敏 郭振清 蔡瑞国 《麦类作物学报》 CAS CSCD 北大核心 2024年第4期462-471,共10页
为探究冀东地区强筋小麦适宜施氮量,以强筋小麦石优20号和中麦998为材料,通过大田试验设置0 kg·hm^(-2)(N_(0))、180 kg·hm^(-2)(N 180)、210 kg·hm^(-2)(N 210)和240 kg·hm^(-2)(N 240)4个施氮水平,分析了施氮量... 为探究冀东地区强筋小麦适宜施氮量,以强筋小麦石优20号和中麦998为材料,通过大田试验设置0 kg·hm^(-2)(N_(0))、180 kg·hm^(-2)(N 180)、210 kg·hm^(-2)(N 210)和240 kg·hm^(-2)(N 240)4个施氮水平,分析了施氮量对强筋小麦光合、产量、蛋白质含量和加工品质的影响。结果表明,与N_(0)处理相比,施氮后石优20号和中麦998的产量均在N 240处理下增加显著,增幅分别为3.20%和13.95%。随施氮量的增加,小麦旗叶叶绿素含量和光合参数均呈先升后降趋势,且在花后15 d达到最大值。施氮对F v/F m影响较小,对ΦPSⅡ影响较明显。旗叶、籽粒内硝酸还原酶和谷氨酰胺合成酶均随施氮量的增加呈先升后降趋势。增施氮肥后籽粒蛋白组分中清蛋白、球蛋白比例下降,醇溶蛋白、谷蛋白比例上升,各组分含量在N 210处理下均最高。面筋含量、沉降值、形成时间和稳定时间均随施氮量的增加先升后降。这说明增施氮肥可改善強筋小麦植株的光合特性,进而提高产量,同时增加植株体内氮代谢相关酶活性和籽粒蛋白质含量并改变蛋白质组分所占比例,有效改善加工品质。本试验条件下,210 kg·hm^(-2)施氮量下,小麦产量和品质较优,该施氮量可作为冀东平原强筋小麦栽培的最佳施氮量。 展开更多
关键词 施氮量 强筋小麦 光合 产量 蛋白质含量 加工品质
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不同灌溉方式对西北干旱区紫花苜蓿生产性能的影响 被引量:1
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作者 刘兴成 甘吉元 +6 位作者 钟辉丽 张田米 胡健泰 朱明敏 于栋 张涛 方梦琪 《节水灌溉》 北大核心 2024年第3期56-61,67,共7页
为了明确紫花苜蓿品质形成差异的水分生理特征,探索因地制宜、节水高效的灌溉模式,以河西地区为例,以不灌水(CK)为对照,对比分析了常规畦灌(M)、交替灌溉(T)和隔沟灌溉(G)等3种不同灌溉方式分别在灌底墒水、越冬水、返青水和现蕾水不同... 为了明确紫花苜蓿品质形成差异的水分生理特征,探索因地制宜、节水高效的灌溉模式,以河西地区为例,以不灌水(CK)为对照,对比分析了常规畦灌(M)、交替灌溉(T)和隔沟灌溉(G)等3种不同灌溉方式分别在灌底墒水、越冬水、返青水和现蕾水不同灌溉量下对“三得利”紫花苜蓿产量和品质的影响。结果表明:(1)不同灌水方式下株高与灌水次数呈正相关,分支数与灌水量呈负相关;交替灌溉在灌底墒水、越冬水、返青水和现蕾水条件下株高三茬平均值最高为91.92 cm。(2)各灌水模式下,紫花苜蓿净光合速率、蒸腾速率随灌水量的增大表现出增高的趋势,其中交替灌溉的净光合速率随灌水量的增大提高了15.64%,且均高于常规畦灌和隔沟灌溉在同等灌水量下净光合速率。(3)不同处理紫花苜蓿的产量随灌水量的增加而增加,漫灌处理紫花苜蓿的三茬总产量显著高于交替灌溉与隔沟灌溉在相同灌水量下苜蓿产量,在灌底墒水、越冬水、返青水和现蕾水条件下三茬总产最高达49447.6 kg/hm^(2)。(4)不同灌水方式紫花苜蓿粗蛋白含量和中性洗涤纤维含量显著高于无灌水(CK)处理,且随着灌水量的增加有不同程度的提高。河西地区地处干旱和半干旱区,以节水灌溉的角度出发,可以选择交替灌溉灌底墒水、越冬水、返青水和现蕾水的灌溉模式能够在保证高产的同时,达到节水的目的。 展开更多
关键词 紫花苜蓿 干旱区 灌溉方式 光合 生长 产量 品质 水分利用率
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Photosynthesis and Transpiration Characters of Alfalfa (Medicago sativa) and Their Relationship with Relevant Factors during Branching Stage
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作者 马宇飞 李红丽 +2 位作者 董智 任国勇 董鲁光 《Animal Husbandry and Feed Science》 CAS 2009年第2期32-35,共4页
[ Objective] The paper presents the diumal changes of photosynthesis and transpiration of different alfalfa varieties and their relationship with the associated physiological and ecological factors during branching st... [ Objective] The paper presents the diumal changes of photosynthesis and transpiration of different alfalfa varieties and their relationship with the associated physiological and ecological factors during branching stage, so as to provide a basis for the development, utilization, and breed- ing of alfalfa. [ Method] Under natural conditions, the diurnal changes of net photosynthetic rate (Pn), transpiration rate (Tr), the relevant physio- logical factors including leaf temperature (TI), stomatal conductance (Gs) and intemal COn concentration (Ci), as well as the relevant physiologi- cal factors including photosynthetic available radiation (PAR), CO2 concentration in field (Ca) and air temperature (Ta) were measured in four al- falfa varieties (Algonguin, WL323 HQ, WL414, and Millionaire). The water use efficiency (WUE) and light use efficiency (LUE) were calculated, and the correlation among them was also analyzed. [Result] The Pn, Tr, PAR and Ta of the four varieties appeared to vary in a single-peak curve; the sequence of WUE was WL323 HQ ~ Algonguin ~ WL414 ~ Millionaire; there was no significant difference in LUE of the four alfalfa varieties; coef- ficient analysis showed that Pn was mainly affected by PAR, Gs, and Ci, while Tr by PAR and Ta. [ Conclusion] WL323 HQ is the variety with high Pn, high WUE and low Tr, and it has strong adaptability to drought. In four alfalfa varieties, PAR, Ta, Gs, and TI are the primary determining fac- tors while Ca and Ci the limiting factors of Tr; Gs is the primary determining factor while Ci the limiting factor of Pn. 展开更多
关键词 Alfalfa Medicago Sativa) net photosynthesis rate Transpiration rate
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Influence of O-O formation pathways and charge transfer mediator on lipid bilayer membrane-like photoanodes for water oxidation
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作者 Yingzheng Li Shaoqi Zhan +9 位作者 Zijian Deng Meng Chen Yilong Zhao Chang Liu Ziqi Zhao Hongxia Ning Wenlong Li Fei Li Licheng Sun Fusheng Li 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2024年第6期526-537,I0013,共13页
Inspired by the function of crucial components in photosystemⅡ(PSⅡ),electrochemical and dyesensitized photoelectrochemical(DSPEC)water oxidation devices were constructed by the selfassembly of well-designed amphipat... Inspired by the function of crucial components in photosystemⅡ(PSⅡ),electrochemical and dyesensitized photoelectrochemical(DSPEC)water oxidation devices were constructed by the selfassembly of well-designed amphipathic Ru(bda)-based catalysts(bda=2,2'-bipyrdine-6,6'-dicarbonoxyl acid)and aliphatic chain decorated electrode surfaces,forming lipid bilayer membrane(LBM)-like structures.The Ru(bda)catalysts on electrode-supported LBM films demonstrated remarkable water oxidation performance with different O-O formation mechanisms.However,compared to the slow charge transfer process,the O-O formation pathways did not determine the PEC water oxidation efficiency of the dyesensitized photoanodes,and the different reaction rates for similar catalysts with different catalytic paths did not determine the PEC performance of the DSPECs.Instead,charge transfer plays a decisive role in the PEC water oxidation rate.When an indolo[3,2-b]carbazole derivative was introduced between the Ru(bda)catalysts and aliphatic chain-modified photosensitizer in LBM films,serving as a charge transfer mediator for the tyrosine-histidine pair in PSⅡ,the PEC water oxidation performance of the corresponding photoanodes was dramatically enhanced. 展开更多
关键词 Water oxidation rate determine step Dye-sensitized photoelectrochemical cell Charge transfer Artificial photosynthesis
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Effects of Paclobutrazol Seed Priming on Seedlings Quality,Physiological and Bakanae Disease Index Characteristics of Rice(Oryza sativa L.)
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作者 Hossam S.El-Beltagi Mohamed Fathi El-Nady +7 位作者 Adel A.Rezk Abdelaziz M.Tahoon Mohammed I.Al-Daej Dina Abdulmajid Mohamed M.El-Mogy Elsayed Abd Elmaksoud Abomarzoka Sherif Mohamed El-Ganainy Metwaly Mahfouz Salem Metwaly 《Phyton-International Journal of Experimental Botany》 SCIE 2024年第10期2535-2556,共22页
Rice(Oryza sativa L.)is one of the most important cereal crops in the world.Bakanae disease is a significant rice disease widely distributed in rice-growing regions worldwide.Therefore,the present investigation aimed ... Rice(Oryza sativa L.)is one of the most important cereal crops in the world.Bakanae disease is a significant rice disease widely distributed in rice-growing regions worldwide.Therefore,the present investigation aimed to assess the optimal concentrations of paclobutrazol(PBZ)as a treatment for rice grains(cv.Sakha 108)to control bakanae disease,also evaluating its impact on grain germination,seedling growth parameters as well as disease index.Paclobutrazol concentrations had no significant impact on seed germination,regardless of whether the seeds were incubated with Fusarium fujikuroi or not.Application of PBZ,either alone or in combination with fungal pathogens,negatively impacted the rice seedlings’height.Paclobutrazol at 25,50 and 100 mg/L,combined with the fungal pathogen positively impacted root length.Paclobutrazol at 3 and 6 mg/L mitigated the adverse impact on chlorophyll pigments content in infected seedlings.The highest proline contents were achieved by 100 mg/L PBZ alone or in combination with fungal pathogens.It has been observed that the application of PBZ,either alone or in combination with a fungal pathogen,leads to the enhancement of catalase,peroxidase,and polyphenol oxidase activities.The median lethal concentration of PBZ was 0.874 mg/L;applying low concentrations of paclobutrazol effectively increased the percentage of fungal growth suppression.Application of PBZ,at higher concentrations(50 and 100 mg/L),decreased infection percentage and disease severity index(DSI)significantly.These findings suggest that PBZ can be an effective treatment for controlling bakanae disease and enhancing resistance in rice plants. 展开更多
关键词 Oryza sativa Fusarium fujikuroi CHLOROPHYLL oxidative enzymes PROLINE photosynthesis rate stomata conductance
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Effect of temperature,salinity and irradiance on growth and photosynthesis of Ulva prolifera 被引量:15
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作者 XIAO Jie ZHANG Xiaohong +6 位作者 GAO Chunlei JIANG Meijie LI Ruixiang WANG Zongling LI Yan FAN Shiliang ZHANG Xuelei 《Acta Oceanologica Sinica》 SCIE CAS CSCD 2016年第10期114-121,共8页
Intensive Pyropia aquaculture in the coast of southwestern Yellow Sea and its subsequent waste, including disposed Ulva prolifera, was speculated to be one of the major sources for the large-scale green tide proceedin... Intensive Pyropia aquaculture in the coast of southwestern Yellow Sea and its subsequent waste, including disposed Ulva prolifera, was speculated to be one of the major sources for the large-scale green tide proceeding in the Yellow Sea since 2007. It was, however, unclear how the detached U. prolifera responded and resumed growing after they detached from its original habitat. In this study, we investigated the growth and photosynthetic response of the detached U. prolifera to various temperature, salinity and irradiance in the laboratory. The photosynthetic rate of the detached U. prolifera was significantly higher at moderate temperature levels(14–27℃)and high salinity(26–32), with optimum at 23℃ and 32. Both low(14℃) and highest temperature(40℃), as well as low salinity(8) had adverse effects on the photosynthesis. Compared with the other Ulva species, U. prolifera showed higher saturated irradiance and no significant photoinhibition at high irradiance, indicating the great tolerance of U. prolifera to the high irradiance. The dense branch and complex structure of floating mats could help protect the thalli and reduce photoinhibition in field. Furthermore, temperature exerted a stronger influence on the growth rate of the detached U. prolifera compared to salinity. Overall, the high growth rate of this detached U. prolifera(10.6%–16.7% d^–1) at a wide range of temperature(5–32℃) and salinity(14–32) implied its blooming tendency with fluctuated salinity and temperature during floating. The environmental parameters in the southwestern Yellow Sea at the beginning of green tide were coincident with the optimal conditions for the detached U. prolifera. 展开更多
关键词 Ulva prolifera green tide photosynthesis growth rate temperature SALINITY
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Photosynthesis,Metabolite Composition and Anatomical Structure of Oryza sativa and Two Wild Relatives,O.grandiglumis and O.alta 被引量:2
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作者 Jwakyung SUNG Suyeon LEE +3 位作者 Jong-Wook CHUNG Gerald EDWARDS Hojin RYU Taewan KIM 《Rice science》 SCIE CSCD 2017年第4期218-227,共10页
Photosynthesis, enzyme activities and metabolite pools associated with primary carbon metabolism in leaves were studied in O. grandiglumis and O. alta (wild relatives of rice which produce high biomass) versus O. sa... Photosynthesis, enzyme activities and metabolite pools associated with primary carbon metabolism in leaves were studied in O. grandiglumis and O. alta (wild relatives of rice which produce high biomass) versus O. sativa (a japonica cultivar and a indica-japonica hybrid) to assess their potential for identifying traits which might be utilized to enhance rice productivity. The wild relatives had higher rates of photosynthesis on a fresh weight basis, and higher water use efficiency than the O. sativa lines. There were no striking differences in activities of a number of key enzymes in carbon and nitrogen metabolism between the wild relatives and cultivated rice lines. Along with higher rates of photosynthesis on a fresh weight basis, the leaves of the two wild species had higher nitrate content, higher levels of starch, glucose and fructose, and higher levels of organic acids (malate, succinate and acetate), compared to the O. sativa lines. The results suggested that O. grandiglumis and O. alta have differences in physiology and primary metabolism which might be exploited to improve growth and productivity of cultivated rice. 展开更多
关键词 CARBOHYDrate photosynthesis rate nitrogen assimilation metabolite composition leaf rice wild relative
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CO_2, H_2O exchange and stomatal regulation of regenerated Camptotheca acuminata plantlets during ex vitro acclimatization 被引量:1
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作者 WANG Hui-mei LI Yan-hua GAO Yin-xiang ZU Yuan-gang 《Journal of Forestry Research》 SCIE CAS CSCD 2006年第4期273-276,共4页
For finding the changes in CO2, H20 exchange and their stomatal regulation during ex vitro acclimatization of regenerated Camptotheca acuminata plantlets, the net photosynthesis rate (Pn), respiration rate (Ro), l... For finding the changes in CO2, H20 exchange and their stomatal regulation during ex vitro acclimatization of regenerated Camptotheca acuminata plantlets, the net photosynthesis rate (Pn), respiration rate (Ro), light compensation point (Lc) and light saturation point (Ls), transpiration rate (Tr), stomatal conductance (gs) and water use efficiency(WUE) were measured during 37 days of ex vitro acclimatization. The results showed that Pn sharply increased until 29 days, then slightly decreased. A substantial decrease in Lc and a substantial increase of Ls in the former two weeks were observed, indicating the light regime enlargement for effective leaf photosynthesis. Tr and gs abruptly decreased during the first week then linearly increased until 29days ex vitro acclimatization, reflecting the strong regulation effect of stomata on water changes of ex vitro acclimating plantlets. Stomatal regulation effect on CO2 exchange was different from that on water exchange, i.e. P, was almost independent of gs during the first week, while P. was significantly correlated with gs thereafter (i.e. dual patterns). Different from dual patterns of gs-Pn relation, the Tr monotonously linearly increased with gs. Furthermore, WUE was almost independent on gs during the first week, while a marked decreasing tendency with gs was found thereafter. At the beginning of the acclimatization, WUE was mainly determined by photosynthetic capacity, while transpiration becomes a main determinant factor for WUE from 7 to 37 days' acclimatization. 展开更多
关键词 Camptotheca acuminate ACCLIMATIZATION photosynthesis TRANSPIRATION Water use efficiency Relation between stomatal conductance (gs) and net photosynthesis rate (Pn) gs-WUE relation
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