Abstract:

In order to analyze the drought resistance of cotton resources， 253 upland cotton resources were used as experimental materials for drought stress treatment at flowering and bolling stages. 15 indexes related to photosynthesis， agronomic traits and yield traits were determined. Through principal component analysis， correlation analysis， drought resistance membership function analysis and cluster analysis， the comprehensive evaluation of drought resistance and drought resistance index screening of 253 upland cotton resources were conducted. With drought resistance measurement value （D value） as the parameter， the above resources could be divided into 5 categories including strong drought resistance， drought resistance， drought resistance， relatively sensitive and sensitive drought. Among them， 14 materials with strong drought resistance included JK625， Kuche 7946 and Kenya 2， drought-sensitive materials included HT-176， Chuan R128， Emian 18， etc.. Effective boll number， stomatal conductance， transpiration rate， chlorophyll relative value， effective branch number， lint weight and plant height were more sensitive to dronght than other indexes， which could be used as key indexes for drought resistance identification at flowering and boll stage. In addition， the relative chlorophyll value， plant height， stomatal conductance and transpiration rate could be used as the vertical indexes for drought resistance at flowering and boll stage.

Key words: cotton, drought resistance, flowering and boll period, drought resistance index

摘要：

为分析棉花资源的抗旱性，以253份陆地棉资源为试验材料，于花铃期进行干旱胁迫处理，测定包括光合作用、农艺性状和产量性状相关的15个指标，通过主成分分析、相关性分析、抗旱隶属函数分析及聚类分析，对其进行抗旱性综合评价及抗旱指标筛选。以抗旱性度量值（D值）为参数，可将上述资源分为强抗旱、抗旱、耐旱、较敏感、敏旱5类。其中，强抗旱材料包括JK625、库车7946、肯尼亚2号等14份；敏旱材料包括HT-176、川R128、鄂棉18号等19份。有效铃数、气孔导度、蒸腾速率、叶绿素相对值、有效果枝数、皮棉重和株高较其他指标更为敏感，可作为花铃期抗旱性鉴定的关键指标；另外，叶绿素相对值、株高、气孔导度和蒸腾速率可作为花铃期抗旱的立测指标。

关键词: 棉花, 抗旱性, 花铃期, 抗旱指标