一氧化氮对弱光胁迫下苗期及坐果初期辣椒生长和抗性相关指标的影响

Effects of nitric oxide on pepper growth and resistance indexes at seedling stage and fruit setting initial stage under weak light stress

以光敏辣椒苗为试验材料,经不同程度遮阴处理后,对遮阴植株喷施一氧化氮供体SNP,测定辣椒植株生长及抗性相关指标,探讨一氧化氮对遮阴胁迫下辣椒相关指标的影响。结果表明:喷施SNP后,辣椒的茎粗、株高、叶面积均有不同程度的提高;叶片中抗氧化酶SOD、POD、CAT的活性增强;同时,叶片中的叶绿素b含量增多,叶绿素合成相关基因的表达水平普遍增强。说明一氧化氮能够缓解弱光环境对辣椒生长的不利影响,一定程度上改善了弱光环境下辣椒叶片的光合性能。

Photosensitive pepper seedlings were used as test materials.After different degrees of shading treatment,the seedlings were sprayed using SNP solution,and the growth and resistance indexes of peppers were determined.The results showed that the diameter,plant height and leaf area of pepper increased after spraying SNP,comparing with the shaded group.The activities of antioxidant enzymes SOD,POD and CAT in leaves increased,meanwhile,the content of chlorophyll b in leaves and the expression level of chlorophyll synthesis-related genes were also generally increased.It was indicated that nitric oxide could alleviate the adverse effects of weak light environment on pepper growth,and improve the photosynthetic performance of pepper leaves in weak light environment to some extent.