Abstract
Bacteria play critical roles in regulating soil phosphorus(P)cycling.The effects of interactions between crops and soil P-availability on bacterial communities and the feedback regulation of soil P cycling by the bacterial community modifications are poorly understood.Here,six soybean(Glycine max)genotypes with differences in P efficiency were cultivated in acidic soils with long-term sufficient or deficient P-fertilizer treatments.The acid phosphatase(AcP)activities,organic-P concentrations and associated bacterial community compositions were determined in bulk and rhizosphere soils.The results showed that both soybean plant P content and the soil AcP activity were negatively correlated with soil organic-P concentration in P-deficient acidic soils.Soil P-availability affected the α-diversity of bacteria in both bulk and rhizosphere soils.However,soybean had a stronger effect on the bacterial community composition,as reflected by the similar biomarker bacteria in the rhizosphere soils in both P-treatments.The relative abundance of biomarker bacteria Proteobacteria was strongly correlated with soil organic-P concentration and AcP activity in low-P treatments.Further high-throughput sequencing of the phoC gene revealed an obvious shift in Proteobacteria groups between bulk soils and rhizosphere soils,which was emphasized by the higher relative abundances of Cupriavidus and Klebsiella,and lower relative abundance of Xanthomonas in rhizosphere soils.Among them,Cupriavidus was the dominant phoC bacterial genus,and it was negatively correlated with the soil organic-P concentration.These findings suggest that soybean growth relies on organic-P mineralization in P-deficient acidic soils,which might be partially achieved by recruiting specific phoC-harboring bacteria,such as Cupriavidus.
基金项目
国家重点研发计划(2021YFF1000500)
Open Competition Program of Ten Major Directions of Agricultural Science and Technology Innovation for the 14th Five-Year Pl(2022SDZG07)
Key Areas Research and Development Programs of Guangdong Province,China(2022B0202060005)
STIC Grant of China(SGDX20210823103535007)
Major Program of Guangdong Basic and Applied Research,China(2019B030302006)
广东省自然科学基金(2021A1515010826)
广东省自然科学基金(2020A1515110261)
国家科技期刊平台
NSTL
万方数据