摘要
为了探讨芥蓝与甘蓝其他变种的分类关系,以2个芥蓝品种、2个青花菜品种、2个球茎甘蓝品种和2个结球甘蓝品种为试材,通过芥蓝与其他3个变种的正反交以及杂交后代自交,测定杂交或自交亲和指数,并以8个亲本和24个杂交组合为材料,对其主要植物学性状进行聚类分析。结果发现:芥蓝与上述具有代表性的甘蓝其他3个变种能正常杂交,平均杂交亲和指数为13.4;杂交后代均正常可育,其植物学形态介于双亲之间,并分别偏向于结球甘蓝、青花菜和球茎甘蓝;各杂交后代自交亲和,平均自交亲和指数为14.1,F2代能正常发芽;聚类分析显示,在欧氏距离为2.78时,2个芥蓝品种单独聚为一类,2个结球甘蓝品种及其与2个芥蓝品种杂交的8个F1可以聚为一类,2个青花菜品种及其与2个芥蓝品种杂交的8个F1可以聚为一类,2个球茎甘蓝品种及其与2个芥蓝品种杂交的8个F1可以聚为一类,芥蓝与结球甘蓝的亲缘关系相对较近。根据试验结果,认为芥蓝与甘蓝其他变种属于同一物种,将其确立为甘蓝的另一个变种是合适的。
The taxonomic relationship has been studied between Chinese kale and the other varieties of Brassica oleracea L.,two Chinese kale cultivars,two broccoli cultivars,two kohlrab cultivars and two cabbage cultivars.Crosses have been made among Chinese kale and broccoli,kohlrab,cabbage,the three varieties of Brassica oleracea,the cross compatibility indexes were investigated,and the resulting hybrids were self-crossed to assess and self-compatibility index.Botanic characters of eight parents and 24 cross combinations were adopted to perform cluster analysis.Our results showed successful crosses between Chinese kale and the three representative varieties of Brassica oleracea with an average compatibility index of 13.4.All resulting hybrids developed into normal and fertile plants,and they had a compatibility index of 14.1 when self-crossed.The hybrids showed combined morphologies of their parents,with different degrees of biases toward broccoli,kohlrab,cabbage,respectively.It was also found that the F2 seeds germinated normally.Cluster analysis with euclidean distance 2.78 implied that two Chinese kale cultivars could be classified into one group,two cabbage cultivars and eight F1 hybrids crossed with two cabbage cultivars and two Chinese kale cultivars could be classified into one group,two broccoli cultivars and eight F1 hybrids crossed with two broccoli cultivars and two Chinese kale cultivars could be classified into one group,and two kohlrab cultivars and eight F1 hybrids crossed with two kohlrab cultivars and two Chinese kale cultivars could be classified into one group.The relationship between Chinese kale and cabbage was closer than that between Chinese kale and broccoli or kohlrabi.Therefore,we conclude that Chinese kale and Brassica oleracea L.most likely belong to the same species,and hypothesize that Chinese kale as another variety of Brassica oleracea may be evolved from cabbage.
出处
《园艺学报》
CAS
CSCD
北大核心
2010年第7期1161-1168,共8页
Acta Horticulturae Sinica
基金
宁波市重大科技计划项目(2009C10009)
关键词
芥蓝
甘蓝
亲和指数
植物学性状
分类
Chinese kale
Brassica oleracea
compatibility index
botanical characters
taxonomykey
