首页|Influences of phosphorus and potassium deficiencies on the methanotrophic communities in rice rhizosphere
Influences of phosphorus and potassium deficiencies on the methanotrophic communities in rice rhizosphere
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NSTL
Elsevier
Soil methanotrophs can modulate net methane (CH4) emissions in rice paddy fields, but their growth and development depend, to a great extent, upon the soil nutrient status. In this study, a pot experiment was conducted to explore how deficiencies in soil phosphorus (P) or potassium (K) affect the methanotrophic abundance (based on pmoA q-PCR), community composition (based on MiSeq high-throughput sequencing) and CH4 oxidation potential using historically severe P and K deficient paddy soils, respectively. The results showed that P deficiency induced a significant decrease in methanotrophic abundance and potential activity in both rhizosphere and bulk soils. Additionally, P deficiency also caused clear shifts in the methanotrophic community composition within the rhizosphere, where the relative abundance of type II methanotrophs (e.g., Methylocystis and Methylosinus) increased while type I (e.g., Methylomonas, Methylobacter and Unclassified_typeIb) decreased. In contrast, K deficiency did not significantly affect the methanotrophic potential activity and community composition in both rhizosphere and bulk soils. More interestingly, P or K deficiency, particularly P deficiency, narrowed the differences in the abundance and community composition between rhizosphere and bulk soils, implying that P and K deficiencies could attenuate the rhizosphere effects on methanotrophic communities by limiting rice plant growth. Collectively, our results indicated that soil P deficiency, would inhibit soil CH4 oxidation directly or indirectly through restricting rice plant growth, while K deficiency have slight effects on the activity and community composition of soil methanotrophs.
NSTL
Elsevier
