硝普钠和硫氢化钠对硝酸盐胁迫下黄瓜种子萌发及幼苗生长的影响

以设施栽培面积较大的黄瓜为材料,研究了外源硫化氢(H2S)和一氧化氮(NO)对硝酸盐胁迫下黄瓜种子萌发和幼苗生长的影响。结果表明,硝酸钙胁迫抑制了黄瓜种子的萌发和幼苗的生长,加入H2S供体硫氢化钠(NaHS)或NO供体硝普钠(SNP)均能有效缓解硝酸钙胁迫对黄瓜种子萌发和幼苗生长的抑制作用,使种子萌发率提高,根系长度、根尖数、表面积和活力增加,胚轴长度增加,叶片叶绿素含量提高,幼苗鲜质量增加;并且加入NaHS和SNP共同处理时,二者对硝酸钙伤害的缓解作用有叠加效应。因此,可通过外源添加SNP和NaHS提高黄瓜的耐硝酸盐胁迫能力。

Effects of SNP and NaHS on Seed Germination and Seedling Growth of Cucumber under Nitrate Stress

The effects of exogenous hydrogen sulfide(H2S)and nitric oxide(NO)on seed germination and seedling growth of cucumber under nitrate stress were studied by using cucumber seeds as materials.The results showed that nitrate stress inhibited the seed germination and seedling growth of cucumber.The addition of H2S donor NaHS or NO donor SNP could effectively alleviate the inhibitory effect of nitrate stress on seed germination and seedling growth of cucumber,with the seed germination rate,the root length,the number of root tips,the root surface area,the root vigor,the length of the hypocotyls,the leaf chlorophyll contentand the fresh mass of the seedlings all increased.And when NaHS and SNP were added together,they had an additive effect on the alleviation of nitrate injury.Therefore,the resistance of cucumber to nitrate stress can be improved by adding exogenous SNP and NaHS.