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藻类靠陆地细菌carry上岸
大约4.7亿年前，第一批水生植物完成了它们的“上陆”壮举，可它们是怎样从水里“走上”陆地的呢？可能是得到了细菌的外援。
为了更好地了解陆生植物的演化，研究人员从两种藻类的DNA着手研究。选取藻类的原因，在于陆生植物就是从这种黏糊糊的绿色生物演化而来的。在这项研究中，研究人员着眼于与陆生植物亲缘关系最近的两种现存藻类，通过比较它们与陆生植物和其他藻类的基因组，来寻找重要的基因相似位点。
他们发现，在这两种藻类和陆生植物的基因组之间，还真存在相似的重要基因位点——例如一种名为GRAS的基因家族。
“我们很好奇这个特殊的基因家族源于何处，因为之前的研究表明
The first plants to come up with ways to live on land accomplished that feat some 470 million years ago. But how did they make the jump from water to terra firma? Looks like they might have had help—from bacteria.
To better understand the evolution of land plants, researchers looked at the DNA of two species of algae. Why algae? Well, because land plants evolved from this green goo. For their study, the team focused on a group of algae known to be the closest living relatives of land plants. The scientists compared the genomes of the two algae species to both land plants and other types of algae. The goal: to locate any important genetic similarities.
And the researchers actually discovered some significant matches between both of the two algae species and land plants—for example, a gene family called GRAS.
“And we were curious where this particular family came from, because it had already been studied before
来源：科研圈
原文链接：http://mp.weixin.qq.com/s?__biz=MzA5NDkzNjIwMg==&mid=2651724331&idx=2&sn=514f3e3fba07e1d0fb6297cc6e50d190
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