外源NaHS对盐胁迫下板栗幼苗的缓解效应

为探讨外源硫化氢对盐胁迫下板栗幼苗的缓解作用,以两年生红粟2号板栗幼苗为试材,研究不同浓度(0、0.1、0.2、0.5、1.0、2.0mmol/L)的硫化氢供体硫氢化钠(NaHS)对I00mmol/L NaCl胁迫下板栗幼苗叶片光合、叶绿素含量、脯氨酸含量及丙二醛(MDA)含量的影响.结果表明:喷施外源NaHS可不同程度缓解盐胁迫对板栗幼苗叶片造成的伤害,与100mmol/L NaC1胁迫处理相比,叶绿素含量提高,MDA含量降低,脯氨酸含量升高,从而有效降低了盐胁迫下细胞膜受损程度,提高了板栗对盐渍环境的适应性,且这种缓解效应存在明显的剂量效应,以0.5、1.0 mmol/L NaHS两个浓度效果较好.

Effect of Exogenous Sodium Hydrosulfide Mitigating Salt Stress on Chestnut (Castanea mollissima) Seedlings

This study was conducted to investigate the alleviating effect of exogenous hydrogen sulfide on chestnut seedlings under salt stress.The effects of different concentrations of (0,0.1,0.2,0.5,1.0 and 2.0 mmol/L) sodium hydrosulfide (NaHS) on the photosynthesis of ‘Hongli 2.'chestnut seedlings and the chlorophyll content,proline content end malondialdehyde (MDA) content in chestnut leaves under 100 mM NaCI stress were investigated.According to the results,spraying exogenous NaHS had positive effects on photosynthesis of chestnut leaves.The application of NaHS could alleviate the damage caused by salt stress on the leaves of chestnut seedlings to different degrees.Compared with the sole treatment with 100 mmol/L NaCI,the chlorophyll content and the proline content were improved.Moreover,MDA content had a significant drop,which effectively reduced the damage of cell membrane under salt stress,The alleviating effect was not obvious with the increase of treatment concentration,and the 0.5 and 1.0 mmol/L NaHS treatments exhibited better effects.