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镉胁迫对油菜根系生理特性的影响 被引量:5
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作者 金美芳 周杨 +1 位作者 卢瑛 黄巧娟 《江西农业大学学报》 CAS CSCD 北大核心 2012年第4期664-670,共7页
采用水培体系,对幼苗期油菜根系进行不同浓度(1,5,10,25,50 mg/L)的Cd2+胁迫,胁迫1,3,6,9 d后测定其若干相关生理特性指标,研究镉对油菜根系生理特性的影响。研究结果表明:Cd2+胁迫下油菜根系的电解质相对外渗率、MDA和游离脯氨酸的含... 采用水培体系,对幼苗期油菜根系进行不同浓度(1,5,10,25,50 mg/L)的Cd2+胁迫,胁迫1,3,6,9 d后测定其若干相关生理特性指标,研究镉对油菜根系生理特性的影响。研究结果表明:Cd2+胁迫下油菜根系的电解质相对外渗率、MDA和游离脯氨酸的含量都随着Cd2+处理浓度的增加而增大,并且各处理浓度与对照差异性显著(P<0.05);可溶性蛋白、可溶性糖含量随着Cd2+处理浓度的增加先升高后降低,低浓度(小于5 mg/L)有明显的促进作用;且各指标随着处理时间的延长逐渐上升。SOD酶活性在胁迫3 d后,随处浓度和处理时间的延长先升高后降低,APX、CAT和POD酶活性随着Cd2+胁迫浓度的升高,先升高后降低,但各种抗氧化酶对浓度的敏感性不同,SOD>APX>CAT>POD。综上述,镉胁迫对油菜根系生长有一定的伤害,使得根系细胞膜透性增加,膜脂过氧化加重,根系利用自身渗透调节物质和抗氧化酶活性升高来调节并适应环境,但是高浓度的镉环境使得根系细胞中积累较多的活性氧等自由基而严重伤害细胞,可溶性蛋白含量以及抗氧化酶活性下降,影响根系生长。 展开更多
关键词 镉胁迫 油菜根系 电解质相对外渗率 丙二醛 渗透调节物质 抗氧化酶活性
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低温胁迫下水杨酸对油菜根系生理活性的影响 被引量:1
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作者 范志强 王军 《安徽农学通报》 2010年第24期19-20,共2页
以油菜根系为实验材料,在低温和低温条件下水杨酸处理下,对油菜根系的超氧化物歧化酶(SOD)活性、丙二醛(MDA)含量、脯氨酸(Pro)变化进行测定。结果表明,水杨酸可使低温条件下SOD活性升高,MDA含量下降,脯氨酸含量升高,从而提高油菜根系... 以油菜根系为实验材料,在低温和低温条件下水杨酸处理下,对油菜根系的超氧化物歧化酶(SOD)活性、丙二醛(MDA)含量、脯氨酸(Pro)变化进行测定。结果表明,水杨酸可使低温条件下SOD活性升高,MDA含量下降,脯氨酸含量升高,从而提高油菜根系的抗冷性。 展开更多
关键词 低温 水杨酸 油菜根系
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不同种植方式及施肥对镉污染油菜根系生长特性的影响 被引量:1
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作者 甘仙 《种子科技》 2021年第2期26-27,共2页
在盆栽条件下,研究了0.6 mg/kg和10.0 mg/kg两个Cd污染水平土壤中,单作、间作及不同施肥处理对油菜根系生长特性中主根长、根体积、根系活力的影响。结果表明,间作鹰嘴豆和施肥处理均能促进油菜根系生长,含Cl-氮钾肥处理对促进油菜主根... 在盆栽条件下,研究了0.6 mg/kg和10.0 mg/kg两个Cd污染水平土壤中,单作、间作及不同施肥处理对油菜根系生长特性中主根长、根体积、根系活力的影响。结果表明,间作鹰嘴豆和施肥处理均能促进油菜根系生长,含Cl-氮钾肥处理对促进油菜主根长、根系体积增大效果要显著优于其他肥料处理;间作可显著提高根系活力。 展开更多
关键词 油菜根系 生长特性 影响
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Effect of Potassium and Moisture on Rape Growth and Its Nutrient Uptake 被引量:1
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作者 CHENJIXING XUANJIANXIANG 《Pedosphere》 SCIE CAS CSCD 1996年第1期81-88,共8页
The Interaction between potassium and moisture during the growth of and nutrient uptake by rapeseed plants grown on K-deficient soils has been investigated in this Study. The results show that the dry weight of the ab... The Interaction between potassium and moisture during the growth of and nutrient uptake by rapeseed plants grown on K-deficient soils has been investigated in this Study. The results show that the dry weight of the above-ground parts of the plant appears to be somewhat reduced when the volume water content of the soil remains 0.15 for 3 successive days. As the shortage in the soil water continues, the height of the plant root and the permeability of the root plasmalemma are markedly affected; the stem thickness and leaf area are reduced. However, K application can increase the dry matter weight of the above-ground parts, the thickness of the stem, and the area of the leaf. Application of K can also maintain a comparatively low water potential(ψ) and a comparatively high moisture content in the leaves, thus increasing the drought-resisting ability of the plant. When the volume water content of the soil is raised to 0.30, leaf yellowing as a symptom of nutrient deficiency appears on rapeseed plants grown on K-deficient soils. With increase in soil moisture content, the Ca concentration of the aerial parts of the rapeseed plant without K application increases while the K concentration decreases. Both K application and the soil moisture regime have very little effect on the Mg concentration in the plant. Under soil moisture stress, the nitrogen content and total amount of alnino acids in rape leaves increases; and thus more proline and glutamic acid is formed. On the other hand, the impact of soil moisture on plant's dry matter is governed by the status of potassium nutrition. On soils with low K, the moisture content has very little effect on yield; when K fertilizer is applied, however, the moisture content shows a very significant effect on yield increase. 展开更多
关键词 MOISTURE nutrient uptake POTASSIUM RAPE root growth
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Genotypic variation in phosphorus acquisition from sparingly soluble P sources is related to root morphology and root exudates in Brassica napus 被引量:6
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作者 ZHANG HaiWei HUANG Yu +1 位作者 YE XiangSheng XU FangSen 《Science China(Life Sciences)》 SCIE CAS 2011年第12期1134-1142,共9页
Genotypic variations in the adaptive response to low-phosphorus (P) stress and P-uptake efficiency have been widely reported in many crops. We conducted a pot experiment to evaluate the P-acquisition ability of two ... Genotypic variations in the adaptive response to low-phosphorus (P) stress and P-uptake efficiency have been widely reported in many crops. We conducted a pot experiment to evaluate the P-acquisition ability of two rapeseed (Brassica napus) geno- types supplied with two sparingly soluble sources of P, A1-P and Fe-P. Then, the root morphology, proton concentrations, and carboxylate content were investigated in a solution experiment to examine the genotypic difference in P-acquisition efficiency. Both genotypes produced greater biomass and accumulated more P when supplied with A1-P than when supplied with Fe-P. The P-efficient genotype 102 showed a significantly greater ability to deplete sparingly soluble P from the rhizosphere soil be- cause of its greater biomass and higher P uptake compared with those of the P-inefficient genotype 105. In the solution exper- iment, the P-efficient genotype under low-P conditions developed dominant root morphological traits, and it showed more in- tensive rhizosphere acidification because of greater H+ effiux, higher H+-ATPase activity, and greater exudation of carbox- ylates than the P-inefficient genotype. Thus, a combination of morphological and physiological mechanisms contributed to the genotypic variation in the utilization of different sparingly soluble P sources in B. napus. 展开更多
关键词 Brassica napus sparingly soluble P genotypic variation root morphology H+ and carboxylate exudation
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