Nethmini Rajapakshalage Thashikala, Zhao Huaxian, Pan Lianghao, Qin Xinyi, Huang Jiongqing, He Qing, Shi Xiaofang, Jiang Gonglingxia, Hou Qinghua, Chen Qingxiang, Li Xiaolei, Dong Ke, Xie Lingling, Li Nan
Key Laboratory of Climate, Resources and Environment in Continental Shelf Sea and Deep Sea of Department of Education of Guangdong Province, Department of Oceanography, Key Laboratory for Coastal Ocean Variation and Disaster Prediction, College of Ocean and Meteorology, Guangdong Ocean University, Zhanjiang, China.
Key Laboratory of Environment Change and Resources Use in Beibu Gulf, Ministry of Education (Nanning Normal University), Nanning, Guangxi, China.
Commun Biol. 2025 Jan 3;8(1):5. doi: 10.1038/s42003-024-07446-1.
Leaf endospheres harbor diverse bacterial communities, comprising generalists and specialists, that profoundly affect ecosystem functions. However, the ecological dynamics of generalist and specialist leaf-endophytic bacteria and their responses to climate change remain poorly understood. We investigated the diversity and environmental responses of generalist and specialist bacteria within the leaf endosphere of mangroves across China. Our findings show a predominance of specialists in the mangrove leaf endosphere. Temperature is the key factor driving community dissimilarity in both groups, yet it negatively influences the alpha diversity. Soil nutritional factors, particularly phosphate for generalists and total organic carbon for specialists are critical in shaping the functional profiles. Interestingly, temperature has a limited impact on functional profiles. Stochastic processes govern community assembly in both bacterial groups, altering the β-nearest taxon indices as temperatures increase. Our findings indicate that the halophytic leaf endosphere favors microbial niche specialization, due to its unique microenvironment and discrete niches, showing thermal sensitivity in terms of the microbial community profile. This study provides insights into niche differentiation and environmental adaptation mechanisms of leaf endophytic microbes in woody halophytes in response to environmental perturbations.
叶内圈含有多样的细菌群落，包括泛化菌和特化菌，它们对生态系统功能有着深远影响。然而，泛化菌和特化菌叶内生细菌的生态动态及其对气候变化的响应仍知之甚少。我们调查了中国各地红树林叶内圈中泛化菌和特化菌的多样性及环境响应。我们的研究结果表明，特化菌在红树林叶内圈中占主导地位。温度是驱动两组群落差异的关键因素，但它对α多样性有负面影响。土壤营养因素，特别是泛化菌的磷酸盐和特化菌的总有机碳，对塑造功能特征至关重要。有趣的是，温度对功能特征的影响有限。随机过程控制着两组细菌的群落组装，随着温度升高改变β最近分类单元指数。我们的研究结果表明，由于其独特的微环境和离散的生态位，盐生植物叶内圈有利于微生物生态位特化，在微生物群落特征方面表现出热敏感性。本研究为木本盐生植物叶内生微生物响应环境扰动的生态位分化和环境适应机制提供了见解。
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