NaCl胁迫对不同抗旱强度胡麻品种农艺性状和生理指标的影响

Effect of NaCl Stress on the Agronomic Traits and Physical Indexes of Flax Cultivar With Drought Resistant

以强抗旱胡麻品种伊亚4号和抗旱系数较低的胡麻品种LY-8号为材料,分析了不同浓度的Na Cl胁迫下的胡麻苗期和成株期农艺性状以及SOD、POD、MDA含量。通过对叶片数、株高、根长等农艺性状分析的结果表明:Na Cl胁迫对胡麻植株的伤害明显,低浓度Na Cl胁迫对不同品种胡麻幼苗的生长均有促进作用,但是随着盐分积累,生长后期对胡麻植株同样会产生伤害,且抗旱性强的胡麻品种同样具有更强的耐盐特性。对生理指标的分析结果表明:伊亚4号苗期和成株期的SOD和POD含量均较LY-8号高,成株期MDA含量较高,而幼苗期则相反。由于耐盐品种具有较高的MDA、SOD含量水平,且保持相对稳定的动态平衡,更有利于对盐胁迫的适应。

To investigate the salt tolerance and physiological reaction of drought-resistant flax varieties to NaCl stress, the agronomic traits and the contents of SOD, POD and MDA of seedlings and adult stage of Yiya-4 （stronger drought-resistance ability） and LY-8 flax（weaker drought-resistance ability） grew in different NaCl concentration were analyzed. The results on agronomic traits, such as the number of leaves, height and the length of root showed that：NaCl stress had significant damages to plants;the low NaCl concentration stress could promote the seedling growth of flax varieties, but the damages would also appear in the later period with the accumulation of salinity; the stronger drought-resistance variety showed stronger salt-tolerance ability. The results on physical traits showed that compared with LY-8 flax variety, the seedlings and adult plants of Yiya-4 flax variety had higher contents of SOD and POD, the content of MDA in adult plants is higher and those in seedlings is lower. It is beneficial to adapt the salt stress because that the salt-tolerance variety had higher contents of MDA and SOD and could remain relative stable dynamic balance.