盐胁迫对豌豆幼苗生理指标的影响

Effects of NaCl Stress on the Physiological Indicator in Pea Seedlings

研究了甘肃大豌豆在不同浓度的盐(NaCl)溶液胁迫下的生理效应。结果表明,100～120mmol·L-1是豌豆的最适生长盐浓度阈值;盐浓度为120mmol·L-1时脯氨酸含量最低,低于和高于此浓度,脯氨酸含量均急剧增长,说明脯氨酸的积累是其在无盐和高盐环境下的产物,它可反映豌豆所受胁迫的程度,但不能作为反映豌豆耐盐性的一项指标;MDA含量随盐浓度的增加而稳定增加,可作为植物抗盐性评价的重要参考指标;低浓度盐溶液可提高豌豆叶绿素含量,高浓度却反之,因此低盐能够刺激叶绿素的合成。

The Physiological effects of NaCl stress in Pisum sativum from Gansu were studied.The results showed that the concentration between 100 mmol·L^-1 and 120 mmol·L^-1 was suitable for pea growth;The proline content was lowest when salt concentration was 120mmol·L^-1. It demonstrated that the accumulation of proline was the result of either sahless or high salt condition,so it could be used as an indicator of salt stress. The MDA content increased steadily with the increasing concentration of NaCl,so it might act as a significant factors in estimating salt resistance. The lower salt concentration could enhance the chlorophyll content of pea.On the contrary the high concentration reduced it.So the lower salt concentration stimulated the synthesis of chlorophyll.