Rhizosphere effect has no effect on marker genes related to autotrophic CO sub(2) fixation in paddy soils?

Purpose: The rhizosphere is a hotspot for microbial activities as well as microbial ecology studies. This study aimed to explore the "rhizosphere effect" on marker genes of CO sub(2) fixation autotrophic microorganisms. Materials and methods: Microcosm experiments were conducted using two...

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Veröffentlicht in:Journal of soils and sediments 2014-06, Vol.14 (6), p.1082-1087
Hauptverfasser: Xiao, Ke-Qing, Nie, San-An, Bao, Peng, Wang, Feng-Hua, Bao, Qiong-Li, Zhu, Yong-Guan
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container_end_page 1087
container_issue 6
container_start_page 1082
container_title Journal of soils and sediments
container_volume 14
creator Xiao, Ke-Qing
Nie, San-An
Bao, Peng
Wang, Feng-Hua
Bao, Qiong-Li
Zhu, Yong-Guan
description Purpose: The rhizosphere is a hotspot for microbial activities as well as microbial ecology studies. This study aimed to explore the "rhizosphere effect" on marker genes of CO sub(2) fixation autotrophic microorganisms. Materials and methods: Microcosm experiments were conducted using two different types of paddy soil, planted with rice and added with urea. At tillering and ripening stages, bulk and rhizosphere soils were sampled separately for DNA extraction and quantitative PCR analyses. Results and discussion: Six marker genes (cbbLG, cbbLR, cbbM, aclB, oorA, accA) of three autotrophic pathways (the Calvin cycle, the reductive tricarboxylic acid cycle, and the 4-hydroxybutyrate cycle) were detected, suggesting their pervasiveness in paddy soil. Redundancy analysis and variation partitioning based on partial redundancy analysis revealed higher contributions of growth stage (explaining 37 %) and soil type (explaining 19 %) on the variation of these genes, lower but significant impact of rhizosphere effect (explaining 12 %), and no significant effect of urea addition (P>0.05). Conclusions: These results suggested that the composition of CO sub(2) fixation autotrophic microorganisms in the paddy soil was subject to combined actions of soil type and growth stage as well as rhizosphere effect.
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This study aimed to explore the "rhizosphere effect" on marker genes of CO sub(2) fixation autotrophic microorganisms. Materials and methods: Microcosm experiments were conducted using two different types of paddy soil, planted with rice and added with urea. At tillering and ripening stages, bulk and rhizosphere soils were sampled separately for DNA extraction and quantitative PCR analyses. Results and discussion: Six marker genes (cbbLG, cbbLR, cbbM, aclB, oorA, accA) of three autotrophic pathways (the Calvin cycle, the reductive tricarboxylic acid cycle, and the 4-hydroxybutyrate cycle) were detected, suggesting their pervasiveness in paddy soil. Redundancy analysis and variation partitioning based on partial redundancy analysis revealed higher contributions of growth stage (explaining 37 %) and soil type (explaining 19 %) on the variation of these genes, lower but significant impact of rhizosphere effect (explaining 12 %), and no significant effect of urea addition (P&gt;0.05). 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title Rhizosphere effect has no effect on marker genes related to autotrophic CO sub(2) fixation in paddy soils?
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