Diploidy, polyploidy, and winter hardiness relationships in the flowering plants
Diploidy, polyploidy, and winter hardiness relationships in the flowering plants
复制标题
DOI：
10.2307/2436450
复制
发表时间：
1940-06-01
影响因子：
3
通讯作者：
Bowden, WM
中科院分区：
文献类型：
--
作者：
Bowden, WM
A scale of winter hardiness was constructed to compare the resistance to cold of related spp. belonging to families ranging from the temp. zone to the tropics. The data obtained have been arranged in an extensive table, and show the author''s chromosome number detns. of 100 spp. and vars. of angiosperms, with a comparison of counts already reported in related spp. In most cases differences in the degree of winter hardiness of related spp. are not correlated with chromosome-number differences. A wide range of variation in degree of winter hardiness was found within the diploid spp. of many genera, and several hardy spp. which are the northernmost representatives of tropical families proved to be diploids. The same chromosome number was often found in hardy and non-hardy spp. of closely related genera belonging to tropical families. Tetraploid spp. are either hardier, less hardy, or of the same degree of hardiness as compared with related diploid spp. The whole range of hardiness has been demonstrated within the tetraploid spp. of a genus. In other genera striking differences in the degree of hardiness were found within both diploid and tetraploid groups of spp. In nature, genic mutation and inter- and intra-specific hybridization have evidently been more important processes than chromosome doubling. The data do not support the theory that polyploids are usually hardier than diploids and are therefore better adapted to climatically unfavorable regions.
