文献类型：期刊文献

英文题名：Host specificity of plant-associated bacteria is negatively associated with genome size and host abundance along a latitudinal gradient

作者：Wang, Zihui[1,2] Lajoie, Genevieve[3,4] Jiang, Yuan[5] Zhang, Minhua[2] Chu, Chengjin[5] Chen, Yongfa[5] Fang, Shuai[6] Jin, Guangze[7] Jiang, Mingxi[8] Lian, Juyu[9] Li, Yanpeng[10] Liu, Yu[2] Ma, Keping[11] Mi, Xiangcheng[11] Qiao, Xiujuan[8] Wang, Xihua[12] Wang, Xugao[6] Xu, Han[10] Ye, Wanhui[9] Zhu, Li[11] Zhu, Yan[11] He, Fangliang[2,13] Kembel, Steven W.[1,2]

第一作者：Wang, Zihui

通信作者：Kembel, SW[1];He, FL[2]

机构：[1]Univ Quebec Montreal, Montreal, PQ, Canada;[2]East China Normal Univ, Sch Ecol & Environm Sci, ECNU Alberta Joint Lab Biodivers Study, Tiantong Forest Ecosyst Natl Observat & Res Stn, Shanghai, Peoples R China;[3]Univ Montreal, Montreal, PQ, Canada;[4]Jardin Bot Montreal, Montreal, PQ, Canada;[5]Sun Yat Sen Univ, Sch Ecol, State Key Lab Biocontrol, Guangzhou, Peoples R China;[6]Chinese Acad Sci, Inst Appl Ecol, Shenyang, Peoples R China;[7]Northeast Forestry Univ, Ctr Ecol Res, Harbin, Peoples R China;[8]Chinese Acad Sci, Key Lab Aquat Bot & Watershed Ecol, Wuhan Bot Garden, Wuhan, Peoples R China;[9]Chinese Acad Sci, Key Lab Vegetat Restorat & Management Degraded Ec, South China Bot Garden, Guangzhou, Peoples R China;[10]Chinese Acad Forestry, Res Inst Trop Forestry, Guangzhou, Peoples R China;[11]Chinese Acad Sci, Inst Bot, State Key Lab Vegetat & Environm Change, Beijing, Peoples R China;[12]East China Normal Univ, Sch Ecol & Environm Sci, Tiantong Forest Ecosyst Natl Observat & Res Stn, Shanghai, Peoples R China;[13]Univ Alberta, Dept Renewable Resources, Edmonton, AB, Canada

年份：2024

卷号：27

期号：6

外文期刊名：ECOLOGY LETTERS

收录：;Scopus(收录号：2-s2.0-85195439253);WOS:【SCI-EXPANDED(收录号:WOS:001258231700004)】；

基金：Natural Sciences and Engineering Research Council of Canada; China Scholarship Council; Canada Research Chairs

语种：英文

外文关键词：dispersal; genome streamlining; host abundance; host specialization; latitudinal gradients of host specificity; phyllosphere bacteria

摘要：Host specialization plays a critical role in the ecology and evolution of plant-microbe symbiosis. Theory predicts that host specialization is associated with microbial genome streamlining and is influenced by the abundance of host species, both of which can vary across latitudes, leading to a latitudinal gradient in host specificity. Here, we quantified the host specificity and composition of plant-bacteria symbioses on leaves across 329 tree species spanning a latitudinal gradient. Our analysis revealed a predominance of host-specialized leaf bacteria. The degree of host specificity was negatively correlated with bacterial genome size and the local abundance of host plants. Additionally, we found an increased host specificity at lower latitudes, aligning with the high prevalence of small bacterial genomes and rare host species in the tropics. These findings underscore the importance of genome streamlining and host abundance in the evolution of host specificity in plant-associated bacteria along the latitudinal gradient. Our study provided empirical evidence for three fundamental predictions regarding the mechanisms of host specialization in plant-bacteria symbiosis, by a comprehensive assessment of the host specificity in leaf-associated bacteria along a latitudinal gradient. We revealed negative effects of genome size and host species abundance on the host specificity of leaf bacteria, consistent with the expectation that host specialization is accompanied by genome streamlining and is influenced by host abundance. Additionally, we demonstrated an increased host specificity at lower latitudes, in line with the decreased bacterial genome size and increased prevalence of rare host species in the tropics. These findings highlighted the interplay among host specificity, genome streamlining and host plant abundance in driving the latitudinal diversity gradient of plant-bacteria symbioses.image