盐胁迫下接种丛枝菌根真菌对两种典型荒漠河岸林植物幼苗生长和叶绿素荧光特性的影响  

Effects of inoculation with arbuscular mycorrhizal fungi on the growth and chlorophyll fluorescence characteristics of the seedlings of two typical plant species in desert riparian forest under salt stress

作　　者：陈晓楠 伊力努尔·艾力 高文礼 王海鸥 麦格皮热提古丽·达吾提 马晓东[1] CHEN Xiaonan;AILI Yilinuer;GAO Wenli;WANG Haiou;DAWUTI Maigepiretiguli;MA Xiaodong(College of Life Science,Xinjiang Normal University,Xinjiang Key Laboratory of Special Species Conservation and Regulatory Biology,Urumqi 830054,China)

机构地区：[1]新疆师范大学生命科学学院,新疆特殊环境物种保护与调控生物学实验室,乌鲁木齐830054

出　　处：《生态学杂志》2024年第5期1333-1340,共8页Chinese Journal of Ecology

基　　金：国家自然科学基金项目(42067067);新疆维吾尔自治区自然科学基金项目(2020D01A74)资助。

摘　　要：多枝柽柳和疏叶骆驼刺是塔里木河下游荒漠河岸林中两种典型的菌根植物,二者在幼苗生长脆弱期受盐胁迫影响较大。为探讨盐胁迫下丛枝菌根真菌(arbuscular mycorrhizal fungi,AMF)对两种植物幼苗生长及叶绿素荧光特性的影响,本试验采用盆栽试验法,设置空白对照(CK)、接种AMF(CK+AMF)、盐胁迫(S)和盐胁迫下接种AMF(S+AMF)4种处理,测定幼苗根系AMF侵染情况(侵染率、侵染强度)、幼苗生长(株高、基径、冠幅、根长、根表面积、根系平均直径、根体积、根尖数)、叶绿素含量(叶绿素a和b、总叶绿素)和叶绿素荧光参数(初始荧光F_(o)、最大荧光F_(m)、光化学淬灭系数qP、非光化学淬灭系数NPQ、最大光化学效率F_(v)/F_(m)和潜在活性F_(v)/F_(o))。结果表明:盐胁迫显著抑制多枝柽柳和疏叶骆驼刺幼苗的侵染率、表观生长指标、叶绿素含量及叶绿素荧光参数(P<0.05);接种AMF可促进幼苗的地上和地下部分的生长;增加叶绿素含量及F_(o)、F_(m)和qP值,减小NPQ值及盐胁迫时间对F_(v)/F_(m)、F_(v)/F_(o)的变化幅度,提高叶绿素荧光特性,以减弱盐胁迫对幼苗的伤害;AMF对疏叶骆驼刺幼苗的缓解作用大于多枝柽柳幼苗;盐胁迫下AMF可通过增加宿主植物根系生长、提高叶绿素含量和叶绿素荧光特性来促进幼苗生长,并在不同生活型植物间存在差异。Tamarix ramosissma and Alhagi sparsifolia are two mycorrhizal plant species in the desert riparian forests of the lower reaches of Tarim River,which are strongly affected by salt stress during seedling growth.To investigate the effects of arbuscular mycorrhizal fungi(AMF)on the growth and characteristics of chlorophyll fluorescence of the seedlings of both species under salt stress,a pot experiment was conducted with four treatments,including control(CK),AMF inoculation(+AMF),salt stress(+S),and AMF inoculation under salt stress(+S+AMF).We measured AMF colonization of seedling roots(colonization rate and intensity),growth characteristics(plant height,basal stem,crown width,root length,root surface area,average root diameter,root volume,and root tip number),chlorophyll content(chlorophyll a and b,and total chlorophyll),and chlorophyll fluorescence parameters(minimum fluorescence F_(o),maximum fluorescence F_(m),photochemical quenching factor qP,non-photochemical quenching factor NPQ,maximum photochemical efficiency F_(v)/F_(m),and potential activity F_(v)/F_(o)).The results showed that salt stress significantly inhibited the colonization rate,apparent growth index,chlorophyll content and chlorophyll fluorescence parameters of seedlings of both species(P<0.05).Inoculation with AMF promoted the aboveground and belowground growth of the seedlings,increased the chlorophyll content and F_(o),F_(m),and qP values,reduced the magnitude of changes in the NPQ values and salt stress time on F_(v)/F_(m) and F_(v)/F_(o),and improved the characteristics of chlorophyll fluorescence to attenuate the damage of salt stress on seedlings.AMF was more effective in mitigating the effect of salt stress on A.sparsifolia seedlings than that on T.ramosissma.Therefore,AMF can promote the growth of seedlings under salt stress by increasing root growth,chlorophyll content,and chlorophyll fluorescence properties in host plants.Such effects vary with different life types of plant species.

关 键 词：丛枝菌根真菌 盐胁迫 多枝柽柳 疏叶骆驼刺 根系 叶绿素荧光 

分 类 号：Q945.78[生物学—植物学]