本次研究结果表明桤木属物种间染色体数目有明显的差异，同一物种不同居群间也有差异存在，而且可能有自然加倍现象；
The results suggested that obvious difference of chromosome number appeared among these Alnus species, even in the same species from different population, and spontaneous polyploidy might occur.
花粉植株中，一般比较健壮的植株染色体较易自然加倍，而比较细弱的植株自然加倍率则较低。
In the pollen plant, it is easy to double chromosome of strong seedling, but it is difficult to double chromosome of weak seedling.
花粉植株中，一般比较健壮的植株染色体较易自然加倍，而比较细弱的植株自然加倍率则较低。
In the pollen plant, it is easy to double chromosome of strong seedling, but it is difficult to double chromosome of weak seedling.
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