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.
而单倍体植株是胡萝卜遗传研究的最好 材料，由单倍体植株染色体加倍而成的纯合二倍体，又是品种选育的最好资 源。
The haploid plant is the best material for genetic research of carrot, and homozygous diploid formed by doubling chromosome of the haploid plant is also the best resource of breed seed selection.
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