计算机模拟世界第一朵花的模样
文章来源:未知 文章作者:enread 发布时间:2017-08-13 06:40 字体: [ ]  进入论坛
(单词翻译:双击或拖选)
All living flowers ultimately derive1 from a single ancestor that lived about 140 million years ago, a study suggests.
 
一项研究表明,地球上现存的所有花卉都起源于1.4亿年前的同一个“祖先”。
 
 
Scientists combined models of flower evolution with the largest data set of features from living flowers ever assembled.
 
From this the team was able to infer the appearance of the ancestral flower.
 
The flower had many concentric cycles of petal2-like organs in sets of three, arranged in whorls, and was bisexual.
 
Hervé Sauquet, from Université Paris-Sud, France, one of the authors of the paper published last week in Nature Communications said: "There is no living flower that looks exactly like the ancestral one. This is a flower that existed at least 140 million years ago and has had considerable time to evolve into the incredible diversity of flowers that exist today."
 
To reconstruct the appearance of the first flower, the scientists recorded the features - such as the petals3 and sepals - of the flowers from 792 living species.
 
They mapped the distribution of these features on to the evolutionary4 tree of flowering plants enabling them to build a picture of what flowers looked like at key points in their history - including the last common ancestor of all living flowers.
 
The first flower is reconstructed with petal-like structures arranged in a whorl, so each petal appears in the same plane, like a common lily (but with more whorls), rather than in a spiral, where petals overlap5 in a spiral arrangement around the stem, like a lotus.


点击收听单词发音收听单词发音  

1 derive hmLzH     
v.取得;导出;引申;来自;源自;出自
参考例句:
  • We derive our sustenance from the land.我们从土地获取食物。
  • We shall derive much benefit from reading good novels.我们将从优秀小说中获得很大好处。
2 petal IMIxX     
n.花瓣
参考例句:
  • Each white petal had a stripe of red.每一片白色的花瓣上都有一条红色的条纹。
  • A petal fluttered to the ground.一片花瓣飘落到地上。
3 petals f346ae24f5b5778ae3e2317a33cd8d9b     
n.花瓣( petal的名词复数 )
参考例句:
  • white petals tinged with blue 略带蓝色的白花瓣
  • The petals of many flowers expand in the sunshine. 许多花瓣在阳光下开放。 来自《现代英汉综合大词典》
4 evolutionary Ctqz7m     
adj.进化的;演化的,演变的;[生]进化论的
参考例句:
  • Life has its own evolutionary process.生命有其自身的进化过程。
  • These are fascinating questions to be resolved by the evolutionary studies of plants.这些十分吸引人的问题将在研究植物进化过程中得以解决。
5 overlap tKixw     
v.重叠,与…交叠;n.重叠
参考例句:
  • The overlap between the jacket and the trousers is not good.夹克和裤子重叠的部分不好看。
  • Tiles overlap each other.屋瓦相互叠盖。
TAG标签: first flower plants
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