盐碱胁迫对小冰麦相对生长率及茎叶离子积累的影响

Effects of Salt and Alkali Stresses on Relative Growth Rate and Accumulation of Ion in Stems and Leaves of Wheat-wheatgrass

将2种中性盐(NaCl和Na2SO4)和2种碱性盐(NaHCO3和Na2CO3)按摩尔质量比1∶1混合,模拟出相同强度的盐碱胁迫条件,并以此对小冰麦33幼苗进行胁迫处理,测定相对生长率及茎叶无机离子含量。结果表明,随着胁迫强度的增加,盐碱胁迫均使小冰麦幼苗RGR显著下降,但碱胁迫处理的下降幅度(0.12 g/d)明显大于盐胁迫(0.06 g/d)处理;碱胁迫引起Na+含量急剧增加,NO-3、SO24-、H2PO-4含量明显降低,引起负电荷亏缺和离子不平衡。

Seedlings of wheat-wheatgrass 33,an alkali-and salt-resistant wheat cultivar,were treated with a range of salt stress（molar ratio of NaCl∶Na2SO4=1∶1） or alkali stress（molar ratio of NaHCO3∶Na2CO3=1∶1）.The relative growth rate and contents of inorganic ions were measured.Experimental results showed that the two stresses made RGR of seedlings decreased significantly,but obviously it was decreased more under alkaline stress than under salt stress.Under alkali stress,content of Na^＋ was greatly increased,while contents of NO3^-,SO4^2-and H2PO4^- were significantly decreased,which caused a severe deficit of negative charges and imbalance of ions.