外源NO诱导辣椒对UV-B胁迫的生理响应

以果期辣椒为试材,研究不同浓度外源NO供体硝普钠(SNP)对UV-B胁迫下辣椒的生理响应,旨在为辣椒栽培生产提供科学参考依据。结果表明:喷施SNP(3 mmol·L^-1)显著提高了UV-B胁迫下辣椒叶片的光合色素含量,光合荧光参数Fv/Fm,抗氧化酶活性(SOD、POD、CAT)和可溶性糖含量;光合荧光参数Fo、丙二醛(MDA)含量显著降低,从而降低了UV-B胁迫对果期辣椒的伤害。综上所述,外源NO参与了辣椒对UV-B胁迫的应答与防御,提高了辣椒对UV-B胁迫的抗性。

Exogenous Nitric Induced Physiological Response of Capsicum annuum L.Under UV-B Stress

In this study,the effects of different concentrations of exogenous nitric donor sodium nitroprusside(SNP)on physiological characteristics of Capsicum annuum L.under UV-B stress was studied using pepper in fruit period in order to procide a scientific basis for Capsicum annuum L.cultivation and production.The results showed that under UV-B stress,spraying SNP(3 mmol·L^-1)significantly increased photosynthetic pigment content,photosynthetic fluorescence parameters Fv/Fm,antioxidant enzyme activities(SOD,POD,CAT)and soluble sugar content in Capsicum annuum L.leaves.Photosynthetic fluorescence parameters Fo and MDA content were significantly reduced;thereby alleviating the damage of chili by UV-B radiation.Exogenous nitric participates in the response and defense of Capsicum annuum L.to UV-B stress,increases the resistance of Capsicum annuum L.to UV-B stress.