Identification of Shading Tolerance in Thirty Brassica campestri sssp.chinensis Varieties
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摘要: 用人工遮荫技术对不同来源的30个不结球白菜品种进行弱光处理,以干物质减少百分率、叶片厚度减少百分率和叶绿素a/b减少百分率3个指标作为评价标准,用系统聚类分析方法,将30个供试不结球白菜品种按其耐弱光性分为3类,即耐弱光性强、耐弱光性中等和不耐弱光品种。其中耐弱光性强的品种6个,占全部样品的20%;耐弱光性中等的品种15个,占50%;不耐弱光的品种9个,占30%。方差分析结果表明,3类品种间的耐弱光性指标差异极显著。其中,品种暑绿、正大抗热青3号、热优2号、抗热605、矮王、华王属于耐弱光品种。Abstract: Thirty varieties of non-heading Chinese cabbage were treated with low light intensityand classified with the cluster analysis by three indices,change of dry weight,change of leaf thick and change of chl.a/b.The thirty varieties were divided into three basic types,tolerant,middle-tolerant and susceptible.Among these varieties,nine were susceptible,fifteen were middle-tolerant,and six were tolerant.The results showed that the correlation of three indices were significant.Comparatively,the varieties Shulü,Zhengda Kangreqing No.3,Reyou No.2,Kangre No.605,Aiwang and Huawang were more tolerant.
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