蕨类植物psaA基因的分子进化研究

发布时间：2018-05-22 09:25

  本文选题：蕨类植物 + 薄囊蕨　； 参考：《植物科学学报》2017年02期

【摘要】：采用"放松分子钟"模型、氨基酸位点正选择模型和分子内共进化网络估算方法,对蕨类植物光合系统Ⅰ核心蛋白PSAA编码基因psaA的进化趋势进行了研究。结果显示,叶绿体基因psaA编码区全序列具备成为蕨类植物系统发育关系重建位点的潜力,与rbcL基因联合后能构建高后验概率的系统发育树;蕨类植物的PSAA蛋白中存在一些曾经历正选择的氨基酸位点,其中29个位点聚合成为16个共进化组,通过共进化网络的方式协同影响光合系统Ⅰ的内部调整,提升其在被子植物兴起后光合环境下的适应能力。本文对蕨类植物进化潜能与分子机理的研究结果为揭示蕨类植物适应新生境提供了科学依据,也为植物系统分类学研究提供了分子依据。
[Abstract]:Using the "relaxation molecular clock" model, the amino acid site positive selection model and the intramolecular coevolutionary network estimation method, the evolution trend of the PSAA encoding gene psaA of the fern photosynthetic system I core protein is studied. The results show that the whole sequence of the psaA coding region of the chloroplast gene has a reconstructive site for the phylogenetic relationship of the ferns. The potential, combined with the rbcL gene, can build a phylogenetic tree with a high posterior probability. There are some amino acid sites that have been selected in the PSAA protein of the ferns, 29 of which are aggregated into 16 co evolution groups, which synergize the internal adjustment of the photosynthetic system I by co evolution network, and enhance its development in the angiosperm. The study on the evolutionary potential and molecular mechanism of ferns in this paper provides a scientific basis for revealing the adaptation of ferns to new habitats, and also provides a molecular basis for the study of plant systematics.
【作者单位】： 湖北中医药大学药学院;中药资源与中药复方教育部重点实验室;
【基金】：国家自然科学基金青年项目(31500260) 湖北中医药大学教育部重点实验室科研启动经费(5114000914);湖北中医药大学“青苗计划”(2016ZZX015)资助~~
【分类号】：Q943.2
，

本文编号：1921509