新疆南疆主栽棉花品种抗旱性综合评价

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experiment was conducted using 15% PEG6000 to simulate drought stress on 15 cotton cultivars from southern Xinjiang. Phenotypicandphysiologicaltraitswereinvestigated，anddroughtresistancecoeficientswerecalculated.Comprehensive evaluationof drought resistance was performed through corelationanalysis，principal componentanalysis （PCA），entropyweightedTOPISethod，andclusteranalysis.Amultiplestepwiseregresionmodelwasestablishedtooptimizetheeluation systemfordroughtresistance.[Results] Compared with thecontrol，drought stress reduced thegerminationenergy（GE）， germinationidex（G）ootumber（RN），inotlength（RL）ocotyngth（HL），reshweight（FW）ndigt （DW） by over 30% ，with HL showing the most significant decline （50.55% ）andhypocotyl diameter（HD） the least （24.66%） 一 Conversely，superoxidedismutase（SOD）and peroxidase（POD）activities，along withmalondialdehyde（MDA）content， increasedby over 20% .PCA condensed the original12 indicators into two independent comprehensive factors，explaining 880% ofvariance，andientifiedfivekeydroughtresistanceindicatorsduringgerination：DA，OD，DW，HD，ndG.Using entropy-weightedTOPSIS，acomprehensivedroughtresistanceindexwasdeterminedandclusteranalysisclassifiedthe15 cultivarsintofourdroughtresistancetypes，includingthreehighdrought-resistantcultivars（Tahe2，Zhongmian13，and Xinluzhong40），fourmoderatedrought-resistantcultivars （Zhongmian88，CCRI979，Xinluzhong61，andJumian），four drought-tolerantresistantcultivars（Xinluzhong88，Zhongmian619，Zhongmian96A，andZhongshengmian17），andfour drought-susceptiblecultivars（Xinluzao50，Xinluzhong67，JBK16，andXinluzhong37）.Areliableregressionmodelforoght resistance evaluation was established： H=0.74-0.51CMDA+0.15CSOD+0.20CDW+0.24CHD+0.45CGE， with acoefficient of determination of0.99.[Conclusion]Highdrought-resistantcultivarsexhibitedsignificantlylowerstressimpactsandhigherantioxidant capacitycomparedtosensitiveones.Theentropy-weightedTOPSIS methodidentifiedTahe2asthemostdrought-resistant cultivar.Thisstudyestablishedapreciseandeficientdroughtresistanceevaluationsystem，providingatheoreticalandtechical support for cotton breeding and cultivation under drought conditions.

Keywords：coton;drought stress; principalcomponentanalysis; entropy-TOPSIS method;stepwiseregresion

新疆独特的气候环境有利于棉花优质高产，现已成为中国最大的优质棉生产基地[1]。（剩余26411字）