The experiment was designed to study whether the decrease of Cd in the rhizosphere of Zhongyouza Ⅰ ,one breed of oilseed rapes (Brassica junica) that can hyperaccumulate cadmium from the soil, can improve the living ...The experiment was designed to study whether the decrease of Cd in the rhizosphere of Zhongyouza Ⅰ ,one breed of oilseed rapes (Brassica junica) that can hyperaccumulate cadmium from the soil, can improve the living condition of less Cd-tolerant plant pai-tsai (Brassia chinensis) with their roots permitted to intermingle and develop coincident rhizosphere. The extent of rhizosphere interactions between ZhongyouzaⅠ and pai-tsai was controlled by different root barriers, or without barrier. The results show that in the 10 and 20 mg/kg Cd treated soils, pai-tsai gets higher shoot mass and less Cd accumulation in its shoot than in the barrier treatments or in the mono cultures, when its roots are permitted to intermingle with those of ZhongyouzaⅠ .Meanwhile, soil decontamination rates of ZhongyouzaⅠ are not affected much by co-cropping with pai-tsai, they are 80.0% and 91.8% of that in the mono cultures of ZhongyouzaⅠ, respectively. However, the co-cropping method in meliorating the living condition of pai-tsai is not obvious when Cd concentration in soil reaches 40 mg/kg, and soil decontamination rate decreases to 0.14, which is 58.3% of that in the mono culture. These results indicate that the oilseed rape ZhongyouzaⅠ may alleviate Cd toxicity of surrounding less-tolerant species, and its ability of phytoremediation is not affected much at the same time, especially in the middle polluted soil.展开更多
The study investigated genotypic and phenotypic co-efficients of variation, heritability, genetic advance at 5% selection intensity and in percentage of population mean of nine characters (plant height, leaf number, l...The study investigated genotypic and phenotypic co-efficients of variation, heritability, genetic advance at 5% selection intensity and in percentage of population mean of nine characters (plant height, leaf number, length and width of leaf lamina, number and weight of cormels per plant, weight of corm per plant, dry matter percentage in the tubers and tuber yield per from 14 cultivars of taro [Colocasia esculenta (L.) Schott]). Results indicated highest genotypic co-efficient of variation for dry matter percentage (47.91), which was 95.78% of the phenotypic co-efficient of variation, whereas tuber yield per plant showed the widest range (819.37). Number of cormels per plant and dry matter percentage ehibited considerably higher heritability (84.90% and 91.70%, respectively) and genetic advance (81.19 and 79.00, respectively), indicating the potentiality of selection for improvement of such characters. These two characters were found to be positively correlated to tuber yield per plant. Path analysis revealed that weight of cormels per plant possessed the highest direct effect on tuber yield, indicating the importance of selection based on this character to increase tuber yield per plant.展开更多
为探明不同稻虾种养模式下水稻中微量元素吸收与稻米品质的关系,开展不同龙虾品种和密度的田间试验,设计水稻单作(rice monoculture,R)、水稻克氏原螯虾低密度共作(rice co-cropping with Procambarus Clarkii in low density,RCL)、水...为探明不同稻虾种养模式下水稻中微量元素吸收与稻米品质的关系,开展不同龙虾品种和密度的田间试验,设计水稻单作(rice monoculture,R)、水稻克氏原螯虾低密度共作(rice co-cropping with Procambarus Clarkii in low density,RCL)、水稻克氏原螯虾高密度共作(rice co-cropping with Procambarus Clarkii in high density,RCH)和水稻澳龙共作(rice co-cropping with Cherax quadricarinatus,RA)4个处理,分析了稻米中微量元素含量、稻米品质、中微量元素与品质的相关性以及经济效益等指标。结果表明:稻虾共作模式提高了稻米中微量元素含量,其中Fe、Ca和Mg含量显著增加,与R处理相比,RCH、RCL和RA处理稻米的Fe含量分别增加52.0%、23.4%和21.4%,Ca含量分别增加45.7%、32.1%和22.8%,Mg含量分别增加45.0%、28.6%和23.3%。稻米中微量元素提升,有利于稻米品质的改善,稻米品质中的蛋白质与Fe、Ca和Mg呈显著(P<0.05)正相关,胶稠度与Fe、Ca和Mg呈极显著(P<0.01)正相关;直链淀粉含量和垩白粒率均与Ca呈极显著(P<0.01)负相关。稻虾共作模式提高了蛋白质含量和胶稠度,降低了稻米的垩白粒率和直链淀粉含量,稻米品质变优,其中RCH处理稻米品质改善效果最好。与R处理相比较,RCH、RCL和RA处理的纯收益分别增加了506%、314%和429%。总体而言,稻虾共作模式能够提高稻米中微量元素含量,改善稻米品质,提高经济效益,因此,在稻虾综合种养模式的选择中,龙虾品种和养殖密度是需要综合考虑的重要因素。展开更多
基金Project(04JJ3013) supported by the Natural Science Foundation of Hunan Province, ChinaProject(2001AA644020) supported by the National High-Tech Research and Development Program of China
文摘The experiment was designed to study whether the decrease of Cd in the rhizosphere of Zhongyouza Ⅰ ,one breed of oilseed rapes (Brassica junica) that can hyperaccumulate cadmium from the soil, can improve the living condition of less Cd-tolerant plant pai-tsai (Brassia chinensis) with their roots permitted to intermingle and develop coincident rhizosphere. The extent of rhizosphere interactions between ZhongyouzaⅠ and pai-tsai was controlled by different root barriers, or without barrier. The results show that in the 10 and 20 mg/kg Cd treated soils, pai-tsai gets higher shoot mass and less Cd accumulation in its shoot than in the barrier treatments or in the mono cultures, when its roots are permitted to intermingle with those of ZhongyouzaⅠ .Meanwhile, soil decontamination rates of ZhongyouzaⅠ are not affected much by co-cropping with pai-tsai, they are 80.0% and 91.8% of that in the mono cultures of ZhongyouzaⅠ, respectively. However, the co-cropping method in meliorating the living condition of pai-tsai is not obvious when Cd concentration in soil reaches 40 mg/kg, and soil decontamination rate decreases to 0.14, which is 58.3% of that in the mono culture. These results indicate that the oilseed rape ZhongyouzaⅠ may alleviate Cd toxicity of surrounding less-tolerant species, and its ability of phytoremediation is not affected much at the same time, especially in the middle polluted soil.
文摘The study investigated genotypic and phenotypic co-efficients of variation, heritability, genetic advance at 5% selection intensity and in percentage of population mean of nine characters (plant height, leaf number, length and width of leaf lamina, number and weight of cormels per plant, weight of corm per plant, dry matter percentage in the tubers and tuber yield per from 14 cultivars of taro [Colocasia esculenta (L.) Schott]). Results indicated highest genotypic co-efficient of variation for dry matter percentage (47.91), which was 95.78% of the phenotypic co-efficient of variation, whereas tuber yield per plant showed the widest range (819.37). Number of cormels per plant and dry matter percentage ehibited considerably higher heritability (84.90% and 91.70%, respectively) and genetic advance (81.19 and 79.00, respectively), indicating the potentiality of selection for improvement of such characters. These two characters were found to be positively correlated to tuber yield per plant. Path analysis revealed that weight of cormels per plant possessed the highest direct effect on tuber yield, indicating the importance of selection based on this character to increase tuber yield per plant.
文摘为探明不同稻虾种养模式下水稻中微量元素吸收与稻米品质的关系,开展不同龙虾品种和密度的田间试验,设计水稻单作(rice monoculture,R)、水稻克氏原螯虾低密度共作(rice co-cropping with Procambarus Clarkii in low density,RCL)、水稻克氏原螯虾高密度共作(rice co-cropping with Procambarus Clarkii in high density,RCH)和水稻澳龙共作(rice co-cropping with Cherax quadricarinatus,RA)4个处理,分析了稻米中微量元素含量、稻米品质、中微量元素与品质的相关性以及经济效益等指标。结果表明:稻虾共作模式提高了稻米中微量元素含量,其中Fe、Ca和Mg含量显著增加,与R处理相比,RCH、RCL和RA处理稻米的Fe含量分别增加52.0%、23.4%和21.4%,Ca含量分别增加45.7%、32.1%和22.8%,Mg含量分别增加45.0%、28.6%和23.3%。稻米中微量元素提升,有利于稻米品质的改善,稻米品质中的蛋白质与Fe、Ca和Mg呈显著(P<0.05)正相关,胶稠度与Fe、Ca和Mg呈极显著(P<0.01)正相关;直链淀粉含量和垩白粒率均与Ca呈极显著(P<0.01)负相关。稻虾共作模式提高了蛋白质含量和胶稠度,降低了稻米的垩白粒率和直链淀粉含量,稻米品质变优,其中RCH处理稻米品质改善效果最好。与R处理相比较,RCH、RCL和RA处理的纯收益分别增加了506%、314%和429%。总体而言,稻虾共作模式能够提高稻米中微量元素含量,改善稻米品质,提高经济效益,因此,在稻虾综合种养模式的选择中,龙虾品种和养殖密度是需要综合考虑的重要因素。
