高级检索+
熊哲铭, 高一波, 任慧莹, 徐波, 吴思婉, 彭圆, 森林. 40种蕨类植物matK基因的系统分类及分子进化研究[J]. 植物科学学报, 2020, 38(1): 10-22. DOI: 10.11913/PSJ.2095-0837.2020.10010
引用本文: 熊哲铭, 高一波, 任慧莹, 徐波, 吴思婉, 彭圆, 森林. 40种蕨类植物matK基因的系统分类及分子进化研究[J]. 植物科学学报, 2020, 38(1): 10-22. DOI: 10.11913/PSJ.2095-0837.2020.10010
Xiong Zhe-Ming, Gao Yi-Bo, Ren Hui-Ying, Xu Bo, Wu Si-Wan, Peng Yuan, Sen Lin. Analysis on the phylogenetic classification and molecular evolution of the matK gene in 40 fern species[J]. Plant Science Journal, 2020, 38(1): 10-22. DOI: 10.11913/PSJ.2095-0837.2020.10010
Citation: Xiong Zhe-Ming, Gao Yi-Bo, Ren Hui-Ying, Xu Bo, Wu Si-Wan, Peng Yuan, Sen Lin. Analysis on the phylogenetic classification and molecular evolution of the matK gene in 40 fern species[J]. Plant Science Journal, 2020, 38(1): 10-22. DOI: 10.11913/PSJ.2095-0837.2020.10010

40种蕨类植物matK基因的系统分类及分子进化研究

Analysis on the phylogenetic classification and molecular evolution of the matK gene in 40 fern species

  • 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Ⅱ型内含子成熟酶蛋白K(Maturase K, MATK)编码基因matK的进化趋势进行研究。结果显示:matK基因在蕨类植物系统学研究中具有一定的应用价值,与rbcL基因和psaA基因联合后能显著提升系统发育树的可信度;蕨类植物MATK蛋白中存在少数曾经历正选择的位点;MATK蛋白内部有多对氨基酸位点共同构成共进化网络。在被子植物兴起环境改变后,MATK蛋白部分位点发生适应性进化,通过位点间共进化网络协同作用方式提升蕨类植物对新光合环境的适应能力。

     

    Abstract: The matK gene is the only group Ⅱ intron maturase encoded in the chloroplast genome. It is the potentiality left untested that applying the matK gene as the molecular marker reconstructs credible fern phylogenetic trees under estimated timescale. Using the relaxed molecular clock model, positive selection model, and co-evolutionary analysis, we attempted to unravel the evolutionary pattern of the matK gene. Results showed that matK had certain application value in the phylogenetic study of ferns, and the reliability of the phylogenetic tree was significantly enhanced when combined with rbcL and psaA. The study also indicated a few positively selected amino-acid sites in the MATK protein. Multiple pairs of amino-acid sites in the MATK protein evolved to form a co-evolutionary network. The modification of the MATK protein by site adaptation and the protein intra-network may be important factors that benefited the adaptive evolution of ferns under the change in photosynthetic environment after the rise of angiosperms.

     

/

返回文章
返回