Viburnum genome size variation is associated with multiple polyploidy events but not physiology

Genome size may influence several aspects of plant biology, from gene regulation and cell size to physiology and speciation, but do global genome size‐trait relationships always hold up in different evolutionary contexts? Moeglein et al. used genome size estimates, in combination with chromosome counts and a suite of ecophysiological traits, to see how genome size governs trait evolution across the woody angiosperm genus Viburnum. They found a positive relationship between chromosome number and genome size, with multiple polyploidy events driving genome size variation across the group. They also found a positive correlation between genome size and guard cell length, but no relationship between genome size and other anatomical and physiological traits. Their results suggest that many traits correlated with genome size across plants broadly are not constrained by genome size in Viburnum, and that perhaps these broad trends are not always relevant at smaller phylogenetic scales.

Moeglein, Morgan K., et al. 2020. Evolutionary dynamics of genome size in a radiation of woody plants. American Journal of Botany https://doi.org/10.1002/ajb2.1544

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荚burn基因组大小变化与多种多倍体事件相关，但与生理学无关

基因组大小可能会影响植物生物学的各个方面，从基因调控和细胞大小到生理学和物种形成，但是全球基因组大小特征关系是否总是在不同的进化背景下成立？Moeglein等。使用基因组大小估计值，结合染色体计数和一系列生态生理特征，来观察基因组大小如何控制整个被子植物木荚属植物荚莲属的性状进化 。他们发现染色体数目与基因组大小之间存在正相关，多个多倍体事件推动了整个群体中基因组大小的变化。他们还发现基因组大小与保护细胞长度之间呈正相关，而基因组大小与其他解剖和生理特征之间没有相关性。他们的结果表明，与整个植物的基因组大小相关的许多性状不受荚莲的基因组大小的限制 ， 并且也许这些广泛的趋势在较小的系统发育尺度上并不总是相关的。

Moeglein，Morgan K.等人。2020年。木本植物辐射中基因组大小的进化动态。美国植物学杂志https://doi.org/10.1002/ajb2.1544