| 低磷胁迫对豇豆幼苗叶片光合特性及根系生理特性的影响 |
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| 引用本文： | 曹翠玲,毛圆辉,曹朋涛,刘建朝,杨向娜.低磷胁迫对豇豆幼苗叶片光合特性及根系生理特性的影响[J].植物营养与肥料学报,2010,16(6):1373-1378. |
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| 作者姓名： | 曹翠玲 毛圆辉 曹朋涛 刘建朝 杨向娜 |
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| 作者单位： | 1.西北农林科技大学生命科学学院,陕西杨凌712100 |
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| 摘 要： | 利用营养液培养方法研究了豇豆幼苗对磷胁迫的生理响应。结果表明,磷胁迫下豇豆根系最大根长增加43%,侧根数目增加33%,根系体积增加;但是缺磷时叶片面积变小,且发育延迟。缺磷时豇豆幼苗根系活力和根系表面酸性磷酸酶活性分别是全磷培养植株的2.3和1.7倍;与供磷植株相比,缺磷植株光合速率和蒸腾速率均下降30%;气孔器变小,气孔密度减少(减少20%)。磷胁迫下豇豆干物质累积量显著降低,缺磷主要影响了地上部分干物质累积,而根系干物质累积几乎不变,因此根冠比增大。磷胁迫对地上的影响大于对根系的影响。
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| 关 键 词： | 磷胁迫 光合特性 根系生理 酸性磷酸酶活性 |
| 收稿时间： | 2009-09-08 |
Effect of phosphorous stress on photosynthesis rate and root physiological characteristic of cowpea seedlings |
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| CAO Cui-ling,MAO Yuan-hui,CAO Peng-tao,LIU Jian-chao,YANG Xiang-na.Effect of phosphorous stress on photosynthesis rate and root physiological characteristic of cowpea seedlings[J].Plant Nutrition and Fertilizer Science,2010,16(6):1373-1378. |
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| Authors: | CAO Cui-ling MAO Yuan-hui CAO Peng-tao LIU Jian-chao YANG Xiang-na |
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| Institution: | 1.College of Life Sciences,Northwest A & F University,Yangling,Shaanxi 712100,China |
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| Abstract: | Effects of phosphorus stress on some physiological indexes of Vigna unguiculata (Linn.) Walp. were studied by hydroponic culture method. The results showed that the main root length under the no phosphorus application treatment (LP) was about 43% longger than that of the control (HP), the lateral root number increased by 33% compared with the control, and the root volume was raised, while the leaf area reduced when the culture solution had no phosphate. When there was no phosphorus supplied, the root activity and secreted acid phosphatase were increased to 2.3 and 1.7 times of those of the phosphorus application treatment, respectively. Compared with the control, both the photosynthetic rate and the transpiration rate decreased by 30%. Under the phosphorus deficiency the dry mass lowered remarkably, and the size of stomata became smaller and stomata density decreased. These results showed that the phosphorus deficiency affected the shoot dry mass accumulation and almost had no effects on accumulation of root dry mass. Phosphorus deficiency had more negative effects on shoot than on root. |
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| Keywords: | phosphorous deficiency photosynthesis root physiological characteristic secreted acid phosphatase |
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