Based on the data collected on chromosome number of 1027 species and ecological environment of plants,the relationships between environmental factors and the changing rules of chromosome number,polyploidy,B chromosome...Based on the data collected on chromosome number of 1027 species and ecological environment of plants,the relationships between environmental factors and the changing rules of chromosome number,polyploidy,B chromosome were discussed.The results showed that under different light,moisture content and soil conditions,the chromosome number of plant is different in multiformity,variation extent and the highest frequency.The frequency of polyploid is relative to habitats and growing habits.The plant with B chromosome is often distributed over the subtropics and humid environment.展开更多
文摘本文通过对半夏属Pinellia 5个种10个群体的染色体计数和珠芽数量统计,首次报道了5个染色体数目,同时发现珠芽的发生与染色体基数及多倍化程度有关:x=13的类群无珠芽,而x=9的有珠芽;在有珠芽的半夏P.ternata(Thunb.)Breit.中,平均每叶珠芽数随倍性的提高而增大。半夏是一个多倍体复合种,起源于无珠芽、染色体基数为x=7～9的二倍体祖先,可能是在该属的早期进化中由鹞落坪半夏P.yaoluopingensis X.H.Guo et X.L.Liu的x=13经非整倍性跌落而成,在发生上比鹞落坪半夏进化。
文摘Based on the data collected on chromosome number of 1027 species and ecological environment of plants,the relationships between environmental factors and the changing rules of chromosome number,polyploidy,B chromosome were discussed.The results showed that under different light,moisture content and soil conditions,the chromosome number of plant is different in multiformity,variation extent and the highest frequency.The frequency of polyploid is relative to habitats and growing habits.The plant with B chromosome is often distributed over the subtropics and humid environment.
