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《Acta Botanica Boreali-occidentalia Sinica》 2003-07
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Environmental adaptation in plant population in the process of molecular evolution ——Primary analysis of the result from the study on the genetic diversity of the desert plants

ZHAO Gui fang, XU Li, ZHANG Lin jing(School of Life Science, Biodiversity Research Center of Qinling Mts., Northwest University, Xi'an 710069, China)  
There has been the deep discussion between the natural selection theory and the neutral theory for the long time. Presently, the difficult problems exist in the study on the environmental adaptation in the process of molecular evolution in plant population: Is the neutral mutation the only reason for the molecular evolution? Does the adaptative evolution driven greatly by the natural selection exist at the molecular level? How can the two different theories and mechanisms be connected and unified? The scholars established the models to describe the direct effect of the natural selection on the molecular markers and the linkage sequences, such as the hypothesis of the variation of the width of niche. The result of our study on the relationship between the genetic variation and the ecological factors in the respective microenvironment of the desert plants in Fukang, Xinjiang, confirmed the hypothesis of the variation of the width of niche and discussed the form and maintenance of the genetic variation. The scientists both from the neutral theory and the selection theory are devoted to explaining the relationship between the molecular variation and the environmental adaptation. The neutral theory and the selection theory are the two sides of the evolution. In fact, they do not contradict to each other, and eventually, they can convert to each other.
【Key Words】: molecular evolution the natural selection theory the neutral theory
【Fund】: 国家重大基础研究与规划项目 中国西部干旱区生态环境演变与调控研究 G19990 43 5 0 3
【CateGory Index】: Q948
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