Mechanisms and rates of genome expansion and contraction in flowering plants
Mechanisms and rates of genome expansion and contraction in flowering plants
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开花植物基因组扩张和收缩的机制和速率
DOI：
10.1023/a:1016015913350
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发表时间：
2002-05-01
期刊：
影响因子：
1.5
通讯作者：
Bennetzen, JL
中科院分区：
文献类型：
--
作者：
Bennetzen, JL
植物基因组的特殊之处在于其基因组大小的巨大变化，这主要是由于其频繁的多倍体起源和反转录转座子的扩增。虽然大多数植物基因组大小变化的研究都集中在核DNA含量的发育或生理效应，可能会影响植物的健身，最近的研究已经开始调查植物基因组的扩展和收缩的可能机制。对“相对中性”的基因组成分（如转座因子）的分析特别富有成效，这主要是由于来自许多不同植物物种的基因组序列信息的巨大增长。目前的数据表明，不等重组可以减缓逆转录转座子扩增引起的基因组大小的增长，但非法重组和其他缺失过程可能是主要负责从小基因组植物中去除非必需DNA。
Plant genomes are exceptional for their great variation in genome size, an outcome derived primarily from their frequent polyploid origins and from the amplification of retrotransposons. Although most studies of plant genome size variation have focused on developmental or physiological effects of nuclear DNA content that might influence plant fitness, more recent studies have begun to investigate possible mechanisms for plant genome expansion and contraction. Analyses of 'relatively neutral' genome components, like transposable elements, have been particularly fruitful, largely due to the enormous growth in genomic sequence information from many different plant species. Current data suggest that unequal recombination can slow the growth in genome size caused by retrotransposon amplification, but that illegitimate recombination and other deletion processes may be primarily responsible for the removal of non-essential DNA from small genome plants.