陆地棉品种资源萌发期耐盐性的隶属函数法评价

Comprehensive Assessment of Salt Tolerance of the Upland Cotton Varities Resources in Seedling Stage by Membership Function Method

【目的】研究萌发期盐胁迫条件下,不同陆地棉品种资源之间耐盐性状差异,分析盐胁迫对棉花萌发期相关性状的影响,筛选耐盐能力强品种,为陆地棉耐盐遗传改良提供理论支持。【方法】以188份国内外棉花品种资源为材料,150. 0 mmol/L NaCl为胁迫浓度,测定在盐胁迫及对照条件下,188份品种资源的发芽势、发芽率、芽长、芽鲜重等4个指标,利用4个指标相对值分析棉花的耐盐性,采用模糊数学的隶属函数法综合评价188份棉花品种资源。【结果】在150. 0 mmol/L(0. 8%) NaCl盐浓度下,188份品种资源的发芽势、发芽率、芽长、芽鲜重的相对值存在显著差异。经隶属函数综合评价,筛选出1份高耐盐材料(新陆中22号)、45份耐盐材料(新陆早1号、新陆早21号、苏棉12号等)、120份中耐材料(新陆中21号、新陆中54号、辽棉17号等)、22份敏感材料(春矮早、新陆中42号、云151075等)。【结论】188份陆地棉品种资源材料大部分耐盐性为中耐(占63. 8%),筛选得到新陆中22号、新陆早1号、新陆早21号等45份耐盐较强材料为陆地棉耐盐遗传改良的亲本材料。

【Objective】The aim of this study is to provide theoretic support for screening of varieties with strong salt tolerance for genetic improvement in upland cotton by studying the difference of salt tolerance characteristics of different upland cotton varieties under salt stress conditions and clarify the effects of slat stress on cotton germinating related traits during germination and contrast periods.【Method】The germination potential,germination rate,bud fresh weight and bud length of 188 varieties resources at home and abroad were studied for comparative analysis under salt stress concentration(150 mmol/L NaCl)and the treatment of spraying clear water.A comprehensive evaluation was concducted about the salt tolerance of the upland cotton varities resources in seedling stage by subordinate function method of Fuzzy Mathematics.【Result】The results showed that the morphologic characters of 188 varieties resources decreased compared with the treatment of spraying clear water in seedling stage,the salt tolerance coefficients of cultivars were different in different varieties,and 1 high salt tolerance varietie resource,45 salt tolerance varieties resources,120 middle salt tolerance varieties resources and 22 salt-sensitive varieties resources were identified by comprehensive evaluation.【Conclusion】Through preliminary screening,most of 188 varieties resources are identified as middle salt tolerance varieties(63.8%)and a total of 45 salt-tolerant materials,such as Xinluzhong 22 and Xinluzao 1 and 21,were selected as parent materials for genetic improvement of salt tolerance in upland cotton.