不同种类外源多胺缓解黄瓜植株盐胁迫伤害的效应

Studies on Alleviative Effects of Different Kinds of Exogenous Polyamine on Salt Injury of Cucumber Seedlings under Salt Stress

采用营养液栽培,研究了盐胁迫下不同种类外源多胺对黄瓜幼苗株高、叶长、叶宽、主根根长及植株干、鲜质量的影响。结果表明,50mmol·L-1NaCl胁迫1d时幼苗株高即显著降低,胁迫3d时幼苗叶长和叶宽显著降低,胁迫7d时幼苗主根根长和植株干、鲜质量显著降低,且抗盐性较弱的津春2号比抗盐性较强的长春密刺植株生长受抑制程度大。外源腐胺、亚精胺、精胺可以不同程度地缓解盐胁迫对黄瓜幼苗生长的抑制作用,缓解效果依次为亚精胺>精胺>腐胺,且3种多胺对津春2号的缓解效果优于长春密刺。

Hydroponics was adopted to study the effects of different kinds of exogenous polyamine on the height of plant,the length and width of leaf, the length of root, fresh and dry weight of cucumber seedlings under salt stress. The results showed that under 50 mmol·L^-1 NaCl stress,the height of plant significantly decreased on the first day,the length and width of leaf significantly reduced on the third day, and the length of root, fresh and dry weight significantly decreased on the seventh day. The inhibition effect of salt stress on cucumber seedlings could be alleviated by exogenous putrescine, spemidine and spermine. The alleviative effect was spemidine 〉 spermine 〉 putrescine, and the alleviative effect of exogenous polyamine was more pronounced in Jinchun No. 2 than in Changchunmici.