摘要
目前有关B染色体在居群中数目多态保持有2种传统观点：杂合优势模型和寄生模型.最近Camacho等提出其多态是变化发展的.对梁王山多星韭（Allium wallichii Kunth）二倍体自然居群中的Bs进行初步分析,发现植株根尖Bs数目恒定且多以低数目（1～2条）存在.统计分析表明Bs频率与海拔高度呈显著正相关,但Bs对多星韭的分蘖、鲜重以及小花数的影响均不显著.讨论了Bs对多星韭居群的适应意义,认为多星韭中的Bs出现于生态条件相对恶劣的环境中.
There are two traditional views about the processes that maintain B chromosome polymorphisrms in populations at present, which are the parasitic model and the heterotic model. Recently Camacho et al, proposed the polymorphisms of Bs is changing and developing. The primary analysis of Bs in natural diploid populations of Allium wallichii Kunth at Liangwang mountain found that the number of Bs in roots of plants is constant and mostly 1-2. The statistic analysis showed that the frequency of Bs is significantly positive corre lated with altitude but respectively there is no significant effect between Bs and tiller, fresh weight, flowers of A. wallichii. The adaption of Bs in population of A. wallichii was discussed and Bs of A. wallichii often existing at relatively adverse environment is adversed.
出处
《云南大学学报（自然科学版）》
CAS
CSCD
北大核心
2006年第2期178-183,共6页
Journal of Yunnan University(Natural Sciences Edition)
关键词
多星韭
B染色体
适应
Allium wallichii Kunth
B chromosome
adaption
