应用生态学报2017，Vol.28Issue(8)：2588-2596,9.DOI:10.13287/j.1001-9332.201708.041
等渗NaCl、干旱胁迫对番茄幼苗光合特性及叶绿体超微结构的影响
Effects of isotonic NaCl and drought stress on photosynthetic characteristics and chloroplast ultrastructure of tomato seedlings
摘要
Abstract
In order to analyze the effects of isotonic salt stress and water stress on the photosynthetic characteristics of tomato leaves,four kinds of genotype tomatoes with different salt tolerance (small fruit type croton agate,wild currant tomato,large fruit type Jintian powder crown,and supernatant 402) were selected to conduct water and isotonic tolerance experiments under 140 mmol · L-1 NaCl and 15％ PEG6000 simulating condition.The results showed that,12 days after treatment,significant decreases in chlorophyll content (chlorophyll a,chlorophyll b,and total chlorophyll),photosynthetic rate,stomatal conductance,intercellular CO2 concentration,and transpiration efficiency were observed,and the value of stomatal limitation was increased.Stomatal factors might reduce the decline in photosynthesis under the two kinds of stresses.The damage of the photosynthetic system under isotonic salt stress was greater than that under water stress,because water stress resulted in osmotic stress and ion damage.Among the genotype tomatoes,the salt-tolerant Lantau red agate exhibited high photosynthetic characteristics,and Jindian powder crown had the lowest photosynthetic efficiency.For the ultrastructure of chloroplasts,both stress treatments increased the stomatal density of tomato leaves,but decreased the numbers of open stomata.The length of chloroplasts was increased,the width was decreased,and the length/width ratios of chloroplasts were increased.In addition,number of chloroplast grana was decreased and that of osmiophilic globules was increased.The effect of salt stress on the chloroplast structure was greater than that of water treatment.The change in stomata of salt-tolerant currant tomato was less than that of salt-sensitive cultivar.关键词
番茄/等渗盐胁迫/干旱胁迫/光合特性/叶绿体超微结构Key words
tomato/isotonic salt stress/drought stress/photosynthetic characteristic/chloroplast ultrastructure引用本文复制引用
杨凤军,李天来,臧忠婧,吴瑕..等渗NaCl、干旱胁迫对番茄幼苗光合特性及叶绿体超微结构的影响[J].应用生态学报,2017,28(8):2588-2596,9.基金项目
本文由国家现代农业产业体系建设专项资金(CARS-25)和大庆市科技计划项目(szdfy-2015-19)资助 This work was supported by the Special Fund Project of National Modern Agricultural Industry Technology System (CARS-25) and the Daqing Science and Technology Project (szdfy-2015-19). （CARS-25）
