SENECIO L (ASTERACEAE) IN AUSTRALIA - NUCLEAR-DNA AMOUNTS
SENECIO L (ASTERACEAE) IN AUSTRALIA - NUCLEAR-DNA AMOUNTS
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DOI：
10.1071/bt9850221
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发表时间：
1985-01-01
影响因子：
1.1
通讯作者：
LAWRENCE, ME
中科院分区：
文献类型：
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作者：
LAWRENCE, ME
核DNA含量为28个种。报道了原产于澳大利亚的千里光属(Senecio)和4个外来种。每个4C核的DNA含量范围为4.22pg到42.90pg，相差10倍。一些变异是由于多倍体造成的，染色体数量从n=5(非倍体减少)到n=50，但每个基因组的DNA含量也从0.84pg到4.69pg不等，相差6倍。DNA含量与细胞大小相关，在某些情况下，还与结构的大小相关。DNA含量与世代长度之间也存在一定的相关性，这与以往的观察结果相一致。讨论了DNA含量变化的可能方向以及自然选择对这一过程的影响。
Nuclear DNA amounts of 28 spp. of Senecio native to Australia and of 4 exotic species are reported. DNA amounts per 4C nucleus range 4.22 pg to 42.90 pg, a 10-fold difference. Some of the variation is due to polyploidy as chromosome numbers range from n = 5 (by dysploid reduction) to n = 50, but DNA amounts per genome also vary from 0.84 pg to 4.69 pg, a 6-fold difference. DNA amounts correlate with cell size and, in some instances, the size of structures. There is also a correlation between DNA amount and generation length which corresponds with previous observations. The possible direction of change in DNA amount and the influence of natural selection on this process are discussed.