學術資源整合系統-相關推薦
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| 作者 | Hong-Wun Chen;Ai-Qun Hu;Li-Wei Tsai;Meng-Ying Tsai;Shih-Hui Liu;Yu-Hsin Tseng;Kuo-Fang Chung |
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| 出版日期 | 20230423 |
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| 著作名稱 | Adaptive significance of stomatal cluster and hypodermis in Asian Begonia: Insights from phylogenetic comparative analyses of a mega-diverse genus
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| 會議論文集 | 植物多樣性與氣候變遷研討會 |
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| 頁數 | 66 |
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| 會議名稱 | 植物分類學年會 |
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| 會議地點 | 臺灣 |
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| 會議日期 | 20230403 |
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| 主辦單位 | 植物分類學年會 |
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| 國際性會議 | N |
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| 主題 | 植物 |
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| 關鍵字 | adaption; Begonia; hypodermis; phylogenetic comparative analysis; stomatal cluster |
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| 摘要 | The stomatal cluster, a unique arrangement which two or more stomata are
grouped together, is found exclusively in the Asterids and Rosids clades, such as
Begonia. Based on field observations, anatomical studies, and ecophysiological data, it is known that the stomatal cluster in Begonia provides higher water use efficiency and larger substomatal cavity than singular stomata. This unique arrangement has been considered an adaptation for growth in arid environments. In Begonia, many taxa with stomatal cluster also possess the hypodermis, which has been recognized as an adaptation for drought resistance. However, since the adaptive significance of the stomatal cluster and/or hypodermis in Begonia was hitherto tested only on a few species, studies with a larger sampling scale are necessary to confirm the general applicability of this hypothesis. In this study, we reconstruct a highly resolved phylogenomic tree of Asian Begonia using Hyb-Seq data, and collect character data for phylogenetic comparative analyses to test the hypothesis. We found a significant phylogenetic correlation between the stomatal cluster and hypodermis in Begonia and the gain of these two characters occurred repeatedly across the phylogeny. These findings suggest that the two characters might be adaptive and specialized for similar specific environments. Additionally, the strong and significant phylogenetic signals detected in both the leaf anatomical traits and habitat types imply the high degree of phylogenetic niche conservatism in Begonia. The transition of singular stomata into stomatal clusters of Asian Begonia occurred mainly in Begonia sect. Baryandra and B. sect. Jackia, whose species are predominantly lithophytic and often face drought stress, thus supporting the previous ecophysiological hypothesis regarding the adaptive significance of stomatal cluster. By integrating phylogenomics and plant anatomy, our results provide new insights into the ecology, evolution and speciation of the mega-diverse Begonia. |
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| 系統號 | NO000006792 |
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