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本土植物与外来物种

作者:www.ruishiye.com  时间:2017-08-19
 
     
      The home team holds the advantage over visitors -- at least in the plant world. However, adaptations could even the playing field. In the current issue of the Proceedings for the National Academy of Sciences, Michigan State University researchers and their collaborators found that plant adaptation to different environments involves tradeoffs in performance.英语课文
      tradeoffs, in part, explain the rich diversity of species on earth. If all plants could perform well in all climates, the world would have similar flora from the poles to the Equator. Tradeoffs, however, such as protection from freezing temperatures in exchange for growing larger, be made by plants, limiting the regions where they can flourish.
     "A racecar driver in Monaco wouldn't choose the same tires as a postal worker in the Yukon," said Douglas Schemske, co-author and MSU plant biologist. "No single tire does well in all conditions, so drivers choose the best tires for snow, rain, sand or racing; biological species reflect similar performance tradeoffs."
     Schemske and Jon Agren led the 5-, the home plants outperformed their visitors, which supported the notion that home populations are adapted to their local conditions.
      basis of plant performance revealed the locals' home-court secrets. Since Sweden has long, harsh winters, the Swedish plants had freezing tolerance as their major adaptive trait. The Italian plants, racing to beat hot, dry summers, devoted much of their energy to flowering in the spring ahead of the heat.
     The long-held view the scientists dispelled, however, was that it takes many genes to fuel the adaptations that allow the plants to thrive in different climates.
     "Even though the environments of Sweden and Italy are vastly different, we found that only 15 regions of the plant's genome are involved in adaptation," Schemske said. "The inte mechanisms of adaptive tradeoffs underscores the value of long-term experiments such as this."
      mechanisms that allow these adaptations have relevance to understanding biodiversity, growing crops in varying climates and projecting the impacts of global change.
     With that in mind, future research on identifying the full spectrum of traits and genes required for adaptation.
     
     
     
本文编辑:www.ruishiye.com

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