摘要
采用根尖染色体压片技术对茎瘤芥、笋子芥和抱子芥不同类型茎用芥菜的染色体核型进行分析,结果表明,茎瘤芥染色体数目为2n=2x=36,核型公式为2n=2x=2sm+34m;笋子芥染色体数目为2n=2x=36,核型公式为2n=2x=8sm+28m;抱子芥染色体数目为2n=2x=36,核型公式为2n=2x=12sm+24m。不同类型茎用芥菜没有出现染色体条数的变化,都属于小染色体,多数染色体为中部着丝点,都属于2B型;仅在染色体长度、着丝点位置、核不对称系数等核型组成上出现了细微的差异,说明不同类型茎用芥菜间具有相似的遗传特性。核不对称系数依次为笋子芥>茎瘤芥>抱子芥,据此推测抱子芥和茎瘤芥可能是由笋子芥进化而来,属于笋子芥的变种。
The karyotypes of three types of tuber mustard（Brassica juncea var. tumida,Brassica juncea var. carassicaulis,Brassica juncea var. gemrnifera） were analyzed using root top squash method. The results showed that the chromosome number of the three types of tuber mustard was 36,the karyotype formulas were 2n=2x=36=2sm＋34m,2n=2x=36=12smq-24m,and 2n=2x= 12smq-24m, respectively, and most chromosomes were metacentric,which belonged to 2B type. However, there was a little difference in the karyotypie configuration among the three types of tuber mustard, such as chromosome length, position of centromere, asymmetry index and so on. The asymmetry index order was Brassica juncea var. carassicaulis〉Brassica juncea var. tumida〉 Brassica juncea var. gernmifera. Therefore, the evolutive degree of Brassica juncea var. carassicaulis was lower than that of Brassica juncea var. tumida and Brassica juncea var. gemmifera.
出处
《河南农业科学》
CSCD
北大核心
2014年第3期111-115,共5页
Journal of Henan Agricultural Sciences
基金
教育部春晖计划项目(Z2011143)
重庆市教委科技计划项目(KJ121304)
重庆市涪陵区科委计划项目(FLKJ
2012ABB1085)
关键词
茎用芥菜
茎瘤芥
笋子芥
抱子芥
染色体
核型分析
tuber mustard
Brassica juncea vat. tumida
Brassica juncea var. carassicaulis
Brassica juncea var. gemmifera
chromosome
karyotypic analysis
