Orientation-driven photosynthesized carbon belowground mediates intercropped peanut microbiota changes for pathogen resistance
文献类型: 外文期刊
第一作者: Lu, Jumeng
作者: Lu, Jumeng;He, Ganghui;Li, Shiwen;Sun, Bo;Chen, Yan;Lu, Jumeng;Shen, Yi;He, Ganghui;Li, Shiwen;Kumar, Amit;Kumar, Amit
作者机构:
关键词: Photosynthesized carbon assimilation; Photosynthetically active radiation; Rhizosphere microbial functioning; Plant growth promotion; Pathogen defence; Burkholderia
期刊名称:PLANT AND SOIL ( 影响因子:4.9; 五年影响因子:5.2 )
ISSN: 0032-079X
年卷期: 2023 年
页码:
收录情况: SCI
摘要: Background and aimsTraditional intercropping of tall and short crops often maintain productivity at the expense of the fitness of the short crop due to planting orientation. There is a need to understand how light interception as influenced by row orientation, affects the vertical allocation of photosynthesized carbon, and how this impacts the rhizosphere microbiota of short crops. This understanding would allow for the optimization of aboveground design to utilize the belowground microbiota for plant and soil health in diversified cropping systems.MethodsWe manipulated the row orientation (east-west vs. north-south) of peanut and maize in a field and conducted simulated pot experiment where peanut plants were shaded. By using 13C tracer approach and DNA stable isotope probing (DNA-SIP) method, we quantified C allocation by peanuts in its rhizosphere including the rhizosphere microorganisms. Moreover, by combining high-throughput sequencing and bacterial cultivation, we evaluated photosynthesized carbon driven the change of rhizosphere microbial composition and its interaction for fungal pathogen resistance.ResultsField intercropping in the north-south orientation increased peanut photosynthetically active radiation to over two times compared to the east-west orientation. The higher light interception increased the relative abundance of photosynthesized carbon which selectively enriched the rhizosphere biomarker Burkholderia to effectively suppressed the pathogenic fungus Alternaria alstroemeriae.ConclusionNorth-south row orientation of peanut and maize intercropping can enhance the allocation of photosynthesized carbon in peanut rhizosphere by changing the light interception. The more photosynthesized carbon triggers the reshape of rhizosphere microbiota and induce beneficial Burkholderia to antagonize peanut pathogen to optimize peanut health.
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