Riley J. Hodgson, Craig Liddicoat, Christian Cando-Dumancela, Nicole W. Fickling, Shawn D. Peddle, Sunita Ramesh, Martin F. Breed
{"title":"干旱加剧加强了泛古热带 C4 草本植物三尖杉(Themeda triandra)的核心细菌根圈关系","authors":"Riley J. Hodgson, Craig Liddicoat, Christian Cando-Dumancela, Nicole W. Fickling, Shawn D. Peddle, Sunita Ramesh, Martin F. Breed","doi":"10.1016/j.apsoil.2024.105514","DOIUrl":null,"url":null,"abstract":"<div><p>Understanding belowground plant-microbial interactions is fundamental to predicting how plant species respond to climate change, particularly in global drylands. However, these interactions are poorly understood, especially for keystone grass species like the pan-palaeotropical <em>Themeda triandra</em>. Here, we used 16S rRNA amplicon sequencing to characterise microbiota in rhizospheres and bulk soils associated with <em>T. triandra</em>. We applied this method to eight native sites across a 3-fold aridity gradient (aridity index range = 0.318 to 0.903 = 87 % global aridity distribution) in southern Australia. By examining the relative contributions of climatic, edaphic, ecological, and host specific phenotypic traits, we identified the ecological drivers of core <em>T. triandra</em>-associated microbiota. We show that aridity had the strongest effect on shaping these core microbiotas, and report that a greater proportion of bacterial taxa that were from the core rhizosphere microbiomes were also differentially abundant in more arid <em>T. triandra</em> regions. These results suggest that <em>T. triandra</em> naturally growing in soils under more arid conditions have greater reliance on rhizosphere core taxa than plants growing under wetter conditions. Our study underscores the likely importance of targeted recruitment of bacteria into the rhizosphere by grassland keystone species, such as <em>T. triandra</em>, when growing in arid conditions. This bacterial soil recruitment is expected to become even more important under climate change.</p></div>","PeriodicalId":8099,"journal":{"name":"Applied Soil Ecology","volume":null,"pages":null},"PeriodicalIF":4.8000,"publicationDate":"2024-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0929139324002452/pdfft?md5=17caa5ef5c4a1b7ccf0dff14fd66de5a&pid=1-s2.0-S0929139324002452-main.pdf","citationCount":"0","resultStr":"{\"title\":\"Increasing aridity strengthens the core bacterial rhizosphere associations in the pan-palaeotropical C4 grass, Themeda triandra\",\"authors\":\"Riley J. Hodgson, Craig Liddicoat, Christian Cando-Dumancela, Nicole W. Fickling, Shawn D. Peddle, Sunita Ramesh, Martin F. Breed\",\"doi\":\"10.1016/j.apsoil.2024.105514\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>Understanding belowground plant-microbial interactions is fundamental to predicting how plant species respond to climate change, particularly in global drylands. However, these interactions are poorly understood, especially for keystone grass species like the pan-palaeotropical <em>Themeda triandra</em>. Here, we used 16S rRNA amplicon sequencing to characterise microbiota in rhizospheres and bulk soils associated with <em>T. triandra</em>. We applied this method to eight native sites across a 3-fold aridity gradient (aridity index range = 0.318 to 0.903 = 87 % global aridity distribution) in southern Australia. By examining the relative contributions of climatic, edaphic, ecological, and host specific phenotypic traits, we identified the ecological drivers of core <em>T. triandra</em>-associated microbiota. We show that aridity had the strongest effect on shaping these core microbiotas, and report that a greater proportion of bacterial taxa that were from the core rhizosphere microbiomes were also differentially abundant in more arid <em>T. triandra</em> regions. These results suggest that <em>T. triandra</em> naturally growing in soils under more arid conditions have greater reliance on rhizosphere core taxa than plants growing under wetter conditions. Our study underscores the likely importance of targeted recruitment of bacteria into the rhizosphere by grassland keystone species, such as <em>T. triandra</em>, when growing in arid conditions. 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Increasing aridity strengthens the core bacterial rhizosphere associations in the pan-palaeotropical C4 grass, Themeda triandra
Understanding belowground plant-microbial interactions is fundamental to predicting how plant species respond to climate change, particularly in global drylands. However, these interactions are poorly understood, especially for keystone grass species like the pan-palaeotropical Themeda triandra. Here, we used 16S rRNA amplicon sequencing to characterise microbiota in rhizospheres and bulk soils associated with T. triandra. We applied this method to eight native sites across a 3-fold aridity gradient (aridity index range = 0.318 to 0.903 = 87 % global aridity distribution) in southern Australia. By examining the relative contributions of climatic, edaphic, ecological, and host specific phenotypic traits, we identified the ecological drivers of core T. triandra-associated microbiota. We show that aridity had the strongest effect on shaping these core microbiotas, and report that a greater proportion of bacterial taxa that were from the core rhizosphere microbiomes were also differentially abundant in more arid T. triandra regions. These results suggest that T. triandra naturally growing in soils under more arid conditions have greater reliance on rhizosphere core taxa than plants growing under wetter conditions. Our study underscores the likely importance of targeted recruitment of bacteria into the rhizosphere by grassland keystone species, such as T. triandra, when growing in arid conditions. This bacterial soil recruitment is expected to become even more important under climate change.
期刊介绍:
Applied Soil Ecology addresses the role of soil organisms and their interactions in relation to: sustainability and productivity, nutrient cycling and other soil processes, the maintenance of soil functions, the impact of human activities on soil ecosystems and bio(techno)logical control of soil-inhabiting pests, diseases and weeds.