Gaut Brandon S, Ross-Ibarra Jeffrey
Department of Ecology and Evolutionary Biology, 321 Steinhaus Hall, University of California Irvine, Irvine, CA 92697-2525, USA.
Science. 2008 Apr 25;320(5875):484-6. doi: 10.1126/science.1153586.
Angiosperms are a relatively recent evolutionary innovation, but their genome sizes have diversified remarkably since their origin, at a rate beyond that of most other taxa. Genome size is often correlated with plant growth and ecology, and extremely large genomes may be limited both ecologically and evolutionarily. Yet the relationship between genome size and natural selection remains poorly understood. The manifold cellular and physiological effects of large genomes may be a function of selection on the major components that contribute to genome size, such as transposable elements and gene duplication. To understand the nature of selection on these genomic components, both population-genetic and comparative approaches are needed.
被子植物是相对较新的进化创新，但自其起源以来，它们的基因组大小已显著多样化，其速度超过了大多数其他类群。基因组大小通常与植物生长和生态相关，极大的基因组在生态和进化方面可能都受到限制。然而，基因组大小与自然选择之间的关系仍知之甚少。大基因组的多种细胞和生理效应可能是对导致基因组大小的主要成分（如转座元件和基因复制）选择的结果。为了理解对这些基因组成分的选择本质，需要群体遗传学和比较方法。
