西藏芥菜型油菜性状演化与分支分类研究

为明确西藏芥菜型油菜的性状演化与分支分类问题, 本文以67 份西藏芥菜型油菜为试验对象, 52 个形态学性状为依据, 白花菜科植物醉蝶花为外类群, 应用最大同步法, 对其进行了研究。结果表明: 芥菜型油菜的基生叶、伸长茎叶、薹茎叶和花器的性状, 均既有同期演化的, 也有非同期演化的, 有各自独特的演化规则; 西藏芥菜型油菜明显分为野生种和栽培种2 大类群, 无论是野生类群还是栽培类群中, 往往是来自于同一地区或气候相似区的材料聚在一起。表明西藏芥菜型油菜种质资源在形态演化上的相似性与其原产地的地理、气候背景密切相关。

Character evolution and branch classification of Brassica juncea (L.) Czern. et Coss.

In this paper, 67 B. juncea germplasm resources were used to determine character evolvement and branch classification based on 52 morphological traits by the maximum synchronization method. In the study, Cleome spinosa Jacq. from Capparidaceae was used as out-group. The results showed unique, homochronous or asnychromous evolution rules of basal leaves, leaves in elongated stems, bolting stem leaves and flowers traits of B. juncea. Sixty-seven B. juncea germplasm resources were classified into two groups, wild and cultivated groups. Regardless of whether the germplasms was wild or cultivated, germplasms of a group always came from one region or different regions with similar climatic conditions. The results indicated similarity in character evolution of B. juncea germplasm resources that was closely related with geographical and climatic backgrounds of the origins.