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Phylogenetic patterns suggest frequent multiple origins of secondary metabolites across the seed-plant ‘tree of life’

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National Science Review 2021年第4期8卷 66-77页

作者： Yongzeng Zhang Tao Deng Lu Sun Jacob B.Landis Michael J.Moore Hengchang Wang Yuehua Wang Xiaojiang Hao Jijun Chen Shenghong Li Maonian Xu Pema-Tenzin Puno Peter H.Raven Hang Sun Missouri Botanical Garden CAS Key Laboratory for Plant Diversity and Biogeography of East Asia Kunming Institute of Botany Chinese Academy of Sciences University of the Chinese Academy of Sciences Department of Botany and Plant Sciences University of California Riverside School of Integrative Plant Science Section of Plant Biology and the L.H.Bailey HortoriumCornell University Department of Biology Oberlin College CAS Key Laboratory of Plant Germplasm Enhancement and Specialty Agriculture Chinese Academy of Sciences School of Life Science Yunnan University State Key Laboratory of Phytochemistry and Plant Resources in West China Kunming Institute of BotanyChinese Academy of Sciences Pharmaceutical Sciences University of Iceland

To evaluate the phylogenetic patterns of the distribution and evolution of plant secondary metabolites(PSMs), we selected 8 classes of PSMs and mapped them onto an updated phylogenetic tree including 437 families of seed plants. A significant phylogenetic signal was detected in 17 of the 18 tested seed-plant clades for at least 1 of the 8 PSM classes using the D statistic. The phylogenetic signal, nevertheless, indicated weak clustering of PSMs compared to a random distribution across all seed plants. The observed signal suggests strong diversifying selection during seed-plant evolution and/or relatively weak evolutionary constraints on the evolution of PSMs. In the survey of the current phylogenetic distributions of PSMs, we found that multiple origins of PSM biosynthesis due to external selective forces for diverse genetic pathways may have played important roles. In contrast, a single origin of PSMs seems rather uncommon. The distribution patterns for PSMs observed in this study may also be useful in the search for natural compounds for medicinal purposes.

关键词： secondary metabolites phylogenetic tree phylogenetic signal co-diversification evolution bioprospecting seed plants

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