摘要
利用PEG-6000模拟水分胁迫,研究了紫花苜蓿(北极星、陇东及阿尔冈金)幼苗叶片及茎受到水分胁迫及恢复正常的不同生理生态反应。结果表明:苜蓿叶片和茎对水分胁迫的适应能力与复水后的补偿能力存在差异,即叶片对水分胁迫的敏感性强于茎,因此受到的影响大于茎,复水后的补偿效应弱于茎。主要表现在受到胁迫后,叶片相对含水量显著下降而茎相对含水量没有明显变化,茎可溶性糖和脯氨酸含量变化幅度以及MDA的累积量均小于叶片;随着复水时间的延长,叶片和茎各指标逐渐向对照水平恢复,但茎可溶性糖和脯氨酸含量以及丙二醛含量先于叶片恢复到对照水平。另外,不同品种在生物学特性上、对水分亏缺的抵抗能力上以及复水后的补偿能力方面存在差异。
The different eco-physiological characteristics of leaf and stem in alfalfa （cv： Polaris, Longdong and Algonquin） seedlings under water stress mimicked by PEG-6000 and rehydration were studied. The results showed that the leaf of alfalfa seedlings was more sensitive to water stress than stem. And the stem has more obvious compensation from damage. The relative water content （RWC） of leaves was decreased but that of stems was unchanged under water stress. And the change range of soluble sugar and proline contents and the accumulation content of MDA in stems were less than those in leaves after water stress. Simultaneously, the content of soluble sugar, proline and MDA in stems recovered to the control level earlier than those in leaves after rehydration though the content of soluble sugar, proline and MDA and RWC both in leaves and stems recovered gradually with the prolon ging of rehydration. On the other hand, the paper showed that there were obviously different between different cultivars.
出处
《西北农业学报》
CAS
CSCD
北大核心
2008年第6期247-252,共6页
Acta Agriculturae Boreali-occidentalis Sinica
基金
中国科学院知识创新工程重要方向项目(KZCX3-SW-444和KSCX2-YW-N-003)
教育部新世纪人才支持计划项目
河南大学自然科学基础研究项目(07YB2R025)
关键词
水分胁迫
复水
紫花苜蓿
生理生态特性
茎叶
Water stress, Rehydration, Alfalfa, Leaf and stem, Eco-physiological characteristics
