12个陆地棉品种（系）苗期耐盐性鉴定评价

摘要

The seedling height,overground biomass dry weight,underground biomass dry weight,root length,root surface ar-ea,root volume and average root diameter were taken as indexes to identify and evaluate the seedling salt tolerance of 12 Varieties or lines of Gossypium hirsutum after 150 mMNaCl treatment.Principal component analyses were done by the in-dexes which had statistical significance.Then cluster analysis was done with the 4 indexes which had bigger feature vectors in principal component.The results show that the 12 cotton varieties (or lines)can be classified into three categories, class A and control ‘9807’(SRI 56.3%)in the same range,various characters inhibition degree was small,belongs to the salt -resistance;class C and control ‘S9612’(SRI 28.2%)in the same range,various characters inhibition degree was obvious,belongs to the salt -sensitivity;and class B contented ‘N23’,‘N830’and ‘Han 7860’belong to the inter-mediate type.Three salt -tolerance cotton varieties were selected including ‘Jimian27 ’,‘Gansu 894021 xuan’and‘Ji863’.%在150 mMNaCl 水培胁迫处理下，以陆地棉苗期的幼苗高度、地上部生物量干重、地下部生物量干重、根系长度、根系表面积、根系体积、根系平均直径为指标，鉴定并评价12份棉花品种（系）的耐盐性。对具有显著性差异的测定指标进行主成分分析，选择第一主成分中具有较大特征向量的4个指标进行聚类分析。结果表明：12个陆地棉品种（系）可归为3类，其中 A 类与对照‘中9807’（耐盐相对成活苗率56.3％）在同一个范围，各性状受抑制程度较小，属于耐盐类；C 类与对照‘中 S9612’（耐盐相对成活苗率28.2％）在同一范围，各性状较明显受到抑制，属于不耐盐类；B 类中的棉花品种（系）N23、N830和邯7860选属于中间类型。由此筛选出3个耐盐品种（系）：冀棉27、甘肃894021选和冀863。