發(fā)布時間：2018-05-22 09:25

  本文選題：蕨類植物 + 薄囊蕨　； 參考：《植物科學學報》2017年02期

【摘要】：采用"放松分子鐘"模型、氨基酸位點正選擇模型和分子內共進化網絡估算方法,對蕨類植物光合系統(tǒng)Ⅰ核心蛋白PSAA編碼基因psaA的進化趨勢進行了研究。結果顯示,葉綠體基因psaA編碼區(qū)全序列具備成為蕨類植物系統(tǒng)發(fā)育關系重建位點的潛力,與rbcL基因聯(lián)合后能構建高后驗概率的系統(tǒng)發(fā)育樹;蕨類植物的PSAA蛋白中存在一些曾經歷正選擇的氨基酸位點,其中29個位點聚合成為16個共進化組,通過共進化網絡的方式協(xié)同影響光合系統(tǒng)Ⅰ的內部調整,提升其在被子植物興起后光合環(huán)境下的適應能力。本文對蕨類植物進化潛能與分子機理的研究結果為揭示蕨類植物適應新生境提供了科學依據(jù),也為植物系統(tǒng)分類學研究提供了分子依據(jù)。
[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.
【作者單位】： 湖北中醫(yī)藥大學藥學院;中藥資源與中藥復方教育部重點實驗室;
【基金】：國家自然科學基金青年項目(31500260) 湖北中醫(yī)藥大學教育部重點實驗室科研啟動經費(5114000914);湖北中醫(yī)藥大學“青苗計劃”(2016ZZX015)資助~~
【分類號】：Q943.2
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本文編號：1921509