NaCl胁迫对燕麦幼苗生长及适应策略的影响

Effects of NaCl Stress on Growth and Adaptation Strategies of Avena Sativa L.Seedlings

文章利用沙培法培养燕麦幼苗,采用0、48、72、96、120、144 mmol/L的NaCl盐浓度梯度进行胁迫处理,探讨NaCl对其幼苗叶及根系生长和生理指标的影响.结果表明:(1)NaCl胁迫强度的增大,对燕麦的存活率无影响;(2)随NaCl胁迫强度的增大,燕麦的生物量、分蘖数、根系长度、体内含水量、叶绿素、K^(+)、Ca、NO^(-)、H_(2)PO_(4)^(-)含量大体呈下降趋势,Na^(+)、Na^(+)/K^(+)、Cl^(-)、SO_(4)^(2-)、脯氨酸含量大体呈增加趋势;(3)NaCl胁迫强度对组织液的pH值、有机酸无显著影响.以上结果说明,在NaCl胁迫下,燕麦主要采取积累脯氨酸、Cl^(-)和SO_(4)^(2-)离子生理适应的方式.另外,根可以改变Na^(+)的分布,减少Na^(+)对叶的伤害并提高燕麦幼苗的耐受力.

In this paper,Avena sativa L.seedlings were cultured with sand culture method and treated with NaCl concentration gradients of 0,48,72,96,120 and 144 mmol/L to explore the effects of NaCl on leaf and root growth and physiological indexes of seedlings.The results showed that:(1)Increasing NaCl stress intensity had no effect on the survival rate of Avena sativa L..(2)With the increase of NaCl stress intensity,biomass,tiller number,root length,water content,chlorophyll,K^(+),Ca^(2+),NO_(3)^(-)and H_(2)PO_(4)^(-)contents generally decreased,while Na^(+),Na^(+)/K^(+),Cl,SO_(4)^(2-)and proline contents generally increased.(3)NaCl stress intensity had no significant effect on pH value and organic acid of tissue fluid.These results indicated that Avena sativa L.mainly accumulated proline,Cl^(-)and SO_(4)^(2-)ions in physiological adaptation under NaCl stress.In addition,roots can change the distribution of Na^(+),reduce the damage of Na^(+)to leaves and improve the tolerance of Avena sativa L.seedlings.