生态学报2018，Vol.38Issue(4)：1337-1347,11.DOI:10.5846/stxb201701030011
盐胁迫下AM真菌对沙枣苗木光合与叶绿素荧光特性的影响
Effects of Arbuscular mycorrhizal fungi on photosynthetic and chlorophyll fluorescence characteristics in Elaeagnus angustifolia seedlings under salt stress
摘要
Abstract
The net photosynthetic rate (Pn),gas exchange parameters,chlorophyll fluorescence parameters,and chlorophyll content (chlorophyll a and b,and carotenoids) of Elaeagnus angustifolia leaves inoculated with arbuscular mycorrhizal fungi (GI) and non-inoculated treatments (CK) were measured during stress imposed by concentrations of 0,100,200,or 300 mmol/L NaCl.Gas exchange parameters included transpiration rate (Tr),stomatal conductance (Gs),and intercellular CO2 concentration (Ci).Chlorophyll fluorescence parameters included maximum fluorescence efficiency (Fv/Fm),actual photosystem Ⅱ efficiency (ΦPSⅡ),photochemical quenching coefficient (qP),non-photochemical quenching coefficient (NPQ),apparent electron transfer rate (ETR),light reaction center of PS Ⅱ potential activity (Fv/ Fo),and heat dissipation rate (HDR).The primary findings of these results were threefold.First,the Pn,Tr,Gs,and Ci of E.angustifolia leaves decreased significantly as salt concentration increased in both CK and GI treatments.Moreover,these parameters were significantly higher in GI treatments than in CK treatments (P＜0.05).However,the magnitude of change in these parameters was smaller in GI treatments than in the CK treatment.Second,changes in chlorophyll content in E.angustifolia leaves as salt concentration increased were positively correlated in GI and CK treatments.However,the magnitude of such changes was generally higher in the CK treatments than in the GI treatments.Finally,in the GI treatments,Fv/Fm,ΦPS Ⅱ,qP,ETR,and Fv/Fo initially increased with increasing salt concentration,before decreasing;in CK treatments,these parameters declined consistently as salt concentration increased.Moreover,in GI treatments,NPQ and HDR initially decreased as salt concentration increased,before increasing.In CK treatments,NPQ was similar to that of GI treatments,whereas HDR decreased gradually as the concentration of salt increased.The magnitude of effect across different salt concentrations in these parameters was significantly lower in GI treatments than in CK treatments.Inoculation with arbuscular mycorrhizal fungi (AMF) may promote salt tolerance in plants by improving photosynthetic and chlorophyll fluorescence characteristics,which in turn,promotes plant growth in saline habitats.We suggest that inoculation of halophytes with mycorrhizal symbionts can have potential applications in improving the usability of saline-alkali land.关键词
AM真菌/盐胁迫/沙枣/叶绿素含量/叶绿素荧光参数Key words
Arbuscular mycorrhizal fungi/salt stress/Elaeagnus angustifolia/chlorophyll content/chlorophyll fluorescence parameters引用本文复制引用
贾婷婷,常伟,范晓旭,宋福强..盐胁迫下AM真菌对沙枣苗木光合与叶绿素荧光特性的影响[J].生态学报,2018,38(4):1337-1347,11.基金项目
国家自然科学基金面上项目(31570635) （31570635）
黑龙江省杰出青年科学基金(JC201306) （JC201306）
国家林业公益性行业科研专项经费项目(201504409) （201504409）
哈尔滨市留学回国创业人才项目(2017RALXJ008) （2017RALXJ008）
