农业科技与技术（英文）2025，Vol.26Issue(2)：18-24,7.DOI:10.16175/j.cnki.1009-4229.2025.02.003
外源茉莉酸甲酯对臭氧胁迫下海棠幼苗光合参数及叶绿素荧光特性的影响
Effect of MeJA at Different Concentrations on Photosynthetic Parameters and Chlorophyll Fluorescence Parameters of Malus spectabilis Seedlings Under O3 Stress
摘要
Abstract
This study aimed to decipher the mechanism by which exogenous methyl jasmonate(MeJA)regulated the photosynthesis of Malus spectabilis leaves under ozone(O3)stress.The photosynthetic parameters and chlorophyll fluorescence parameters of M.spectabilis'Hongjiu'seedlings under O3 stress were measured by spraying different concentrations of MeJA.The results showed that O3 stress significantly reduced the chlorophyll a and total chlorophyll content,net photosynthetic rate(Pn),stomatal conductance(Gs),transpiration rate(Tr),maximum fluorescence yield(Fm),maximum quantum yield of photosystem II(Fv/Fm),and actual photochemical efficiency of photosystem II(ФPSII),while increasing the intercellular CO2 concentration(Ci).Exogenous MeJA reduced the Ci and original fluorescence yield(Fo),while increasing chlorophyll a,chlorophyll b,and total chlorophyll content,Pn,Gs,Tr,Fm,Fv/Fm,and ФPSII of the leaves under O3 stress.The application of 150 µmol/L MeJA showed the best effect.The above results demonstrated that exogenous MeJA could enhance chlorophyll content and photosynthetic capacity,thereby improving the tolerance of M.spectabilis to O3 stress.关键词
茉莉酸甲酯/臭氧胁迫/海棠/光合参数/叶绿素荧光Key words
Methyl jasmonate/Ozone stress/Malus spectabilis/Photosynthetic parameters/Chlorophyll fluorescence引用本文复制引用
王延玲,孙舒琪,徐畅,陈琳,郭莹莹,张慧..外源茉莉酸甲酯对臭氧胁迫下海棠幼苗光合参数及叶绿素荧光特性的影响[J].农业科技与技术（英文）,2025,26(2):18-24,7.基金项目
Supported by National Natural Science Foundation of China(32072553) （32072553）
Natural Science Foundation of Shandong Province(ZR2020MC134) 国家自然科学基金项目(32072553) （ZR2020MC134）
山东省自然科学基金项目(ZR2020MC134) （ZR2020MC134）
