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首页> 美国卫生研究院文献>Microbes and Environments >Effects of Elevated Carbon Dioxide Elevated Temperature and Rice Growth Stage on the Community Structure of Rice Root–Associated Bacteria
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Effects of Elevated Carbon Dioxide Elevated Temperature and Rice Growth Stage on the Community Structure of Rice Root–Associated Bacteria

机译：二氧化碳升高温度升高和水稻生育期对水稻根系相关细菌群落结构的影响

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摘要

The effects of free-air carbon dioxide enrichment (FACE) and elevated soil and water temperature (warming) on the rice root–associated bacterial community were evaluated by clone library analysis of the 16S ribosomal RNA gene. Roots were sampled at the panicle initiation and ripening stages 41 and 92 days after transplanting (DAT), respectively. The relative abundances of the methanotrophs Methylosinus and Methylocystis were increased by warming and decreased by FACE at 92 DAT, which indicated that microbial methane (CH4) oxidation in rice roots may have been influenced by global warming. The relative abundance of Burkholderia kururiensis was increased by warming at 41 DAT and by FACE or warming at 92 DAT. The abundances of methanotrophs increased during rice growth, which was likely induced by an enhancement in the emission of CH4 from the paddy fields, suggesting that CH4 is one of the predominant factors affecting the structure of the microbial community in rice roots. Marked variations in the community structure were also observed during rice growth in other genera: Bradyrhizobium, Clostridium, and an unknown genus close to Epsilonproteobacteria were abundant at 92 DAT, whereas Achromobacter was abundant at 41 DAT. These results demonstrated that the community structures of rice root-associated bacteria were markedly affected by FACE, temperature, and the rice growth stage.
机译：通过对16S核糖体RNA基因的克隆文库分析，评估了空气中二氧化碳富集（FACE）和土壤和水温升高（变暖）对水稻根系相关细菌群落的影响。在移栽后第41天和第92天（DAT）分别在圆锥花序的起始和成熟阶段对根进行采样。变温甲基甲烷营养菌和甲基囊藻的相对丰度在92 DAT时通过变暖而增加，而通过FACE降低，表明水稻根部微生物甲烷（CH4）的氧化可能已受全球变暖的影响。通过在41 DAT加热和FACE或在92 DAT加热，可以增加kururiensis伯克霍尔德菌的相对丰度。水稻生长过程中甲烷氧化菌的丰度增加，这很可能是由于稻田中CH4的排放增加所致，这表明CH4是影响水稻根系微生物群落结构的主要因素之一。在其他属的水稻生长过程中，也观察到了群落结构的显着变化：缓生根瘤菌，梭状芽胞杆菌和一个与Epsilon变形杆菌接近的未知属，在92 DAT时丰富，而无色杆菌在41 DAT时丰富。这些结果表明，水稻根系相关细菌的群落结构受到FACE，温度和水稻生长期的显着影响。

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