生态学报2018，Vol.38Issue(4)：1183-1193,11.DOI:10.5846/stxb201701120094
荒漠区植物雾冰藜光合特性对混合盐碱胁迫的响应
Response of various salt-alkaline mixed stresses on the photosynthetic characteristics of Bassia dasyphylla in a desert region
摘要
Abstract
Two neutral salts,NaCl and Na2SO4,and two alkali salts,Na2CO3and NaHCO3,were selected and mixed in various ratios according to the varying ranges of salinity and pH in the natural soil,and the response of Bassia dasyphylla seedlings to salt-alkaline stress was determined.The photosynthetic pigment content,photosynthetic gas exchange parameters,and chlorophyll fluorescence parameters were determined.The results showed 30 different salt-alkaline ecological conditions,which included salinity of 50-250 mmol/L and pH values of 7.10-10.19.The chlorophyll a (Chl a),chlorophyll b (Chl b),and carotenoids (Caro) contents,net photosynthetic rate (Pn),stomatal conductance (Gs),intercellular CO2 mole fractions (Ci),transpiration rate (Tr),PS Ⅱ potential efficiency (Fv/F0),maximal photochemical efficiency (Fv/Fm),PS Ⅱ actual quantum yield (ΦPSⅡ),apparent electron-transfer rate (ETR),and photochemical quenching (qP) indexes of the treatment group were significantly lower than that of the control group;both reduced with increasing salinity and pH;and were significantly different (P ＜ 0.05) from the negative control group.Steady state fluorescence (Fs) result indicates the variation trendency of " M-type" with increasing salinity and pH,which is firstly increased and then decreased,followed the similar trendency again.Water use efficiency (WUE) and non-photochemical quenching (NPQ) showed irregular change with increasing salinity and pH.The correlation coefficient between salt ions and the photosynthetic characteristics showed that the rejection capability of sodium salts was Na2CO3 ＞ NaHCO3 ＞ NaCl ＞ Na2SO4 in the photosynthetic pigment content index and gas exchange parameters.The effect of salt ions and chlorophyll fluorescence parameters was comparatively complex.This study suggests that salt-alkaline environments inhibited the photosynthetic system of B.dasyphylla,and negatively affected several physiological responses.关键词
雾冰藜/盐碱胁迫/光合色素/气体交换参数/叶绿素荧光参数Key words
Bassia dasyphylla/salt-alkaline stresses/photosynthetic pigment content/photosynthetic gas exchange parameters/chlorophyll fluorescence parameters引用本文复制引用
李辛,赵文智..荒漠区植物雾冰藜光合特性对混合盐碱胁迫的响应[J].生态学报,2018,38(4):1183-1193,11.基金项目
国家自然科学基金面上项目(41471435) （41471435）
