Abstract：[Objective]Thisstudyaimstoevaluate theefectsofdiferentarbuscularmycorhizalfungi（AMF）oncottongrowth undersalt stress，ndscreenforAMFstrains thatpromotecottongrowthmoreeficientlyundersaltstress[Methods]Usingthe main varietiesofZhongmian113andTahe2inXinjiangasmaterials，theeffectsofinoculationwithdifferentAMFoncoton sedling growthdryatercculation，gexangeparameers，trogen，osporus，otassicclationdK/a ratio were studied.Theoptimal strain was determined through acomprehensive evaluation method based onentropy weight. [Results]TheresultsshowedthatAMFinoculationsignificantlypromotedthegrowthofcotonseedlingsundersaltstre. Compared withcottonplant without AMFinoculation，theplantheightof Zhongmian113inoculatedwithdiferentAMFstrain significantly increased by 62.13%89.55% ，the dry matter mass per plant significantly increased by 122.58%-141.94% ，the root-shoot ratio decreased by 20.38%49.34% ，theaboveground water content increased by 8.40%-12.65% ，and the root water content increased by 9.78%-15.61% ；Compared with cotton plant without AMF inoculation，the plant height of Tahe2 inoculated with different AMF straub was significantly increased by 70.23%-103.88% ，the dry matter mass per plant was significantly increased by 80.95%-188.10% ，the root shoot ratio was reduced by 42.40%-59.28% ，the aboveground water content was increased by 5.88%-11.11% ，and the root water contentwas increased by 12.05%-18.51% .Inoculation of AMF enhanced theabsorptionofnitrogen，phosphorusandpotassumbycottn.Comparedwithnoinoculation，theK/Naratioinsotsof Zhongmian113and Tahe2increased by 53.81%-102.96% and 40.54%-122.10% ，respectively.The effects of inoculating diferentAMFshowed significantdiference.Thecomprehensivescoreresults showed thattheoptimalstrainofZhongmian113 was XJ04B，andtheoptimalstrainofTahe2wasXJO2.Conclusion]InoculationwithdiferentAMFcansignificantlyimprove thegrowth ofcotonseedlings undersalt stress，anddiferentstrainshavedierent performances inpromoting cottongrowth undersaltstressThisexperimentprovidesareferenceforscreeningefectiveAMFstrainsincotonundersaltstressenviroment. Keywords： arbuscular mycorrhizal fungi; salt stress; cotton; strain screening; entropy weight method

棉花是我国重要的经济作物，棉花产业的健康发展对我国农业经济有重要影响[。新疆维吾尔自治区是我国最大的棉花主产区，也是重要的商品棉生产基地。新疆是典型的大陆性干旱气候区，光热资源丰富，年降水量较少，土壤盐渍化严重。灌溉用水大多为高山融水与深层地下水，矿物质含量丰富，加剧了土壤的次生盐渍化，而且以膜下滴灌为主的节水灌溉模式未能将棉田土壤充分淋溶，盐渍化已成为制约新疆棉花产业可持续发展的主要问题之一[34]。棉花对轻度盐胁迫具有一定抗性，常被作为盐碱地先锋作物种植在新疆、黄河沿岸、黄淮河中下游、滨海地区等盐渍化土地5。但是盐分过高同样会抑制棉花的正常生长， 3g⋅kg^-1 以上的盐胁迫对棉花种子的萌发和生长造成较严重影响[7-8]。

丛枝菌根真菌（arbuscularmycorrhizal fungi，AMF）是1类常见的土壤真菌，属于球囊菌门（Glomeromycota），分布广泛、种类繁多，具有极强的生境适应性。在森林、草原、农田等众多生态系统中均检测到AMF的存在。AMF可以与包括棉花在内的许多陆生植物形成丛枝、菌丝等共生结构，帮助植物吸收水分与养分（尤其是磷），同时能够增强宿主植物对盐胁迫、养分胁迫、重金属胁迫等逆境的抵抗能力[10-14]。前人研究发现，接种AMF可以通过促进棉花根系发育提高棉花根系对水分、磷、钾的吸收[12]。国秀丽等[13]研究发现，AMF通过促进棉花细根生长、提高细根占比影响植株对磷、钾、钠等元素的吸收，且土著AMF能降低植株中钠的积累量。龚明贵……