30个不结球白菜品种的耐弱光性鉴定

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。

Identification of Shading Tolerance in Thirty Brassica campestris ssp. chinensis Varieties

Thirty varieties of non-heading Chinese cabbage were treated with low light intensity and classifted 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 Shultl, Zhengda Kangreqing No. 3, Reyou No. 2, Kangre No. 605, Aiwang and Huawang were more tolerant.