外源NO和水杨酸对盐胁迫下番茄幼苗光合机构的保护作用  

Protective effect of exogenous nitric oxide and salicylic acid on the photosynthetic apparatus of tomato seedling leaves under NaCl stress

作　　者：孙德智[1] 韩晓日[2] 彭靖[2] 范富[1] 杨恒山[1] 马玉露[1] 侯迷红[1] SUN Dezhi;HAN Xiaori;PENG Jing;FAN Fu;YANG Hengshan;MA Yulu;HOU Mihong(College of Agronomy, Inner Mongoha University for Nationalities, Tongliao 028000, China;College of Land and Enwronment, Shenyang Agrzcultural University, Shenyang 110866, China)

机构地区：[1]内蒙古民族大学农学院,通辽028000 [2]沈阳农业大学土地与环境学院,沈阳110866

出　　处：《应用与环境生物学报》2018年第3期457-464,共8页Chinese Journal of Applied and Environmental Biology

基　　金：内蒙古民族大学科学研究基金项目(NMDYB15097);内蒙古自治区科技创新引导项目(KJCX1602);内蒙古自然科学基金项目(2013MS0605)资助~~

摘　　要：以番茄品种‘秦丰保冠’为试材,在水培条件下研究单独和复配施用一氧化氮（NO）供体硝普钠（SNP）、水杨酸（SA）对100 mmol/L NaCl胁迫下番茄幼苗叶片气体交换、叶绿素荧光、CO2响应曲线、光合色素含量和叶黄素循环的影响.结果显示：（1）单独或复配外施SNP、SA均能使受Na Cl胁迫处理的番茄幼苗叶片净光合速率（Pn）、气孔导度（Gs）、PSⅡ最大光化学效率（Fv/Fm）、天线转化效率（Fv′/Fm′）、实际光化学效率（ΦPSⅡ）、光化学猝灭系数（qP）和叶绿素荧光衰减率（Rfd）不同程度升高,胞间CO2浓度（Ci）、初始荧光（Fo）和PSⅡ非光化学荧光猝灭系数（NPQ）显著降低,其中以SNP和SA复配处理的综合效果最好.（2）NaCl胁迫下,番茄幼苗叶片CO2羧化效率（CE）、Ru BP最大再生速率（J（max））、RuBisCO及其活化酶活性和最大羧化速率（V（c max））的下降均能在单独或复配施用SNP、SA的处理下得到有效缓解,并以SNP和SA复配处理更佳.（3）SNP、SA单独或复配处理均能有效抑制NaCl胁迫下番茄幼苗叶片光合色素（Chl a、Chl b和Car）含量、Chl a/b值和叶黄素循环库（V＋A＋Z）的下降及叶黄素循环脱环氧化程度（A＋Z）/（V＋A＋Z）的升高,且以SA和SNP复配处理效果最明显.本研究表明,NaCl胁迫下依赖叶黄素循环的天线热耗散不是外源NO、SA单独或复配处理保护番茄幼苗叶片光合机构的生理机制,对PSⅡ及其初级电子受体醌（QA）下游电子传递通畅性的保护,以及对CO2同化活性的改善才是外源NO、SA提高番茄幼苗叶片光合功能、增强其耐盐能力的主要原因,其中NO和SA复配处理时具有协同增效作用.Using the tomato variety ‘Qin Feng Bao Guan＇ as experimental material, and by the hydroponics nutrient solution method, we investigated the effects of single and compound applications of nitric oxide（NO） donor sodium nitroprusside（SNP） and salicylic acid（SA） on the gas exchange and chlorophyll fluorescence parameters, Ru Bis CO activation, CO2 response curve, photosynthetic pigment content, and xanthophyll cycle in seedling leaves under an Na Cl stress of 100 mmol/L. The main findings were as follows：（1） Single or combined applications of SNP and SA could increase the net photosynthetic rate（Pn）, stomatal conductance（Gs）, PS II maximal photochemistry efficiency（Fv/Fm）, antenna conversion efficiency（Fv′/Fm′）, practical photochemical efficiency（ΦPSⅡ）, photochemical fluorescence quenching coefficient（qP）, and chlorophyll fluorescence decay rate（Rfd） of tomato seedling leaves at different rates, and significantly reduce the intercellular CO2 concentration（Ci）, original fluorescence（Fo）, and PSⅡ non-photochemical fluorescence quenching coefficient（NPQ）, after Na Cl stress treatment. The strongest effect was observed after applying a combination of SNP and SA.（2） Under NaCl stress, the decrease of CO2 carboxylation efficiency（CE）, Ru BP maximum regeneration rate（J（max））, Ru Bis CO and its activation enzyme activity, and the maximum carboxylation rate（Vc max） in tomato seedling leaves could be effectively relieved by SNP, SA, or SNP ＋ SA applications; however, SNP ＋ SA treatment had the strongest effect.（3） Single or combined applications of SNP and SA could effectively inhibit the decrease of the contents of photosynthetic pigments（chlorophyll a, chlorophyll b, and carotenoids）, the ratio of chlorophyll a and chlorophyll b, xanthophyll cycle pool size（V ＋ A ＋ Z）, and the increase of the de-epoxidation extent of the xanthophyll cycle（A ＋ Z）/（V ＋ A ＋ Z）. The combined application of SNP and SA had t

关 键 词：一氧化氮 水杨酸 盐胁迫 番茄 叶绿素荧光 碳同化 叶黄素循环 

分 类 号：Q945.78[生物学—植物学]