Repeated evolution of salt-tolerance in grasses
Repeated evolution of salt-tolerance in grasses
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DOI：
10.1098/rsbl.2013.0029
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发表时间：
2013-04-23
期刊：
影响因子：
3.3
通讯作者：
Bromham, L.
中科院分区：
文献类型：
--
作者：
Bennett, T. H.;Flowers, T. J.;Bromham, L.
全球受盐影响的农业用地数量正在增加，因此需要能够在受盐影响的土壤中生长的新作物品种。尽管人们一致努力开发耐盐谷类作物，但很少有商业上可行的耐盐作物被释放。考虑到天然耐盐草的数量，这是令人困惑的。为了更好地理解为什么耐盐性自然发生，但很难培育成作物物种，我们采取了一种新的，基于生物多样性的方法来研究它，研究整个禾本科植物耐盐性的进化不稳定性。我们分析了自然耐盐物种的系统发育分布在2684个草类的系统发育，发现耐盐性已经进化了70多次，在广泛的草谱系。这些结果证实了重复分析属水平上的800多个草属的系统发育。虽然耐盐性的进化令人惊讶地频繁，但我们发现它的进化并不经常产生一个大的耐盐物种分支。这些结果表明，耐盐性是一个进化不稳定的性状在禾本科。
The amount of salt-affected agricultural land is increasing globally, so new crop varieties are needed that can grow in salt-affected soils. Despite concerted effort to develop salt-tolerant cereal crops, few commercially viable salt-tolerant crops have been released. This is puzzling, given the number of naturally salt-tolerant grass species. To better understand why salt-tolerance occurs naturally but is difficult to breed into crop species, we take a novel, biodiversity-based approach to its study, examining the evolutionary lability of salt-tolerance across the grass family. We analyse the phylogenetic distribution of naturally salt-tolerant species on a phylogeny of 2684 grasses, and find that salt-tolerance has evolved over 70 times, in a wide range of grass lineages. These results are confirmed by repeating the analysis at genus level on a phylogeny of over 800 grass genera. While salt-tolerance evolves surprisingly often, we find that its evolution does not often give rise to a large clade of salt-tolerant species. These results suggest that salt-tolerance is an evolutionarily labile trait in grasses.