Phosphorus-Mobilizing Rhizobacterial Strain Bacillus cereus GS6 Improves Symbiotic Efficiency of Soybean on an Aridisol Amended with Phosphorus-Enriched Compost  

作　　者：Muhammad Saleem ARIF Muhammad RIAZ Sher Muhammad SHAHZAD Tahira YASMEEN Shafaqat ALI Muhammad Javed AKHTAR 

机构地区：[1]Department of Environmental Sciences and Engineering,Government College University Faisalabad [2]Department of Soil&Environmental Sciences,University College of Agriculture,University of Sargodha [3]Institute of Soil&Environmental Science,University of Agriculture Faisalabad

出　　处：《Pedosphere》2017年第6期1049-1061,共13页土壤圈（英文版）

基　　金：financially supported by the Agricultural Linkages Programme (ALP) of Pakistan Agricultural Research Council (PARC) (ALP/PARC) (No.CS-268) on Microbial Biotechnology for Sustainable Production of Legumes;Prof.Dr.Zahir A.Zahir, Soil Microbiology & Biochemistry Laboratory, Institute of Soil and Environmental Sciences, University of Agriculture Faisalabad, Pakistan, for providing financial and logistic support to carry out the present investigation

摘　　要：Legume plants are an essential component of sustainable farming systems.Phosphorus(P) deficiency is a significant constraint for legume production, especially in nutrient-poor soils of arid and semi-arid regions.In the present study, we conducted a pot experiment to evaluate the effects of a phosphorus-mobilizing plant-growth promoting rhizobacterial strain Bacillus cereus GS6, either alone or combined with phosphate-enriched compost(PEC) on the symbiotic(nodulation-N_2 fixation) performance of soybean(Glycine max(L.) Merr.) on an Aridisol.The PEC was produced by composting food waste with addition of single super phosphate.The bacterial strain B.cereus GS6 showed considerable potential for P solubilization and mobilization by releasing carboxylates in insoluble P(rock phosphate)-enriched medium.Inoculation of B.cereus GS6 in combination with PEC application significantly improved nodulation and nodule N_2 fixation efficiency.Compared to the control(without B.cereus GS6 and PEC), the combined application of B.cereus GS6 with PEC resulted in significantly higher accumulation of nitrogen(N), P, and potassium(K) in grain, shoot, and nodule.The N:P and P:K ratios in nodules were significantly altered by the application of PEC and B.cereus GS6, which reflected the important roles of P and K in symbiotic performance of soybean.The combined application of PEC and B.cereus GS6 also significantly increased the soil dehydrogenase and phosphomonoesterase activities, as well as the soil available N, P, and K contents.Significant positive relationships were found between soil organic carbon(C) content, dehydrogenase and phosphomonoesterase activities, and available N, P, and K contents.This study suggests that inoculation of P-mobilizing rhizobacteria, such as B.cereus GS6, in combination with PEC application might enhance legume productivity by improving nodulation and nodule N_2 fixation efficiency.Legume plants are an essential component of sustainable farming systems.Phosphorus（P） deficiency is a significant constraint for legume production, especially in nutrient-poor soils of arid and semi-arid regions.In the present study, we conducted a pot experiment to evaluate the effects of a phosphorus-mobilizing plant-growth promoting rhizobacterial strain Bacillus cereus GS6, either alone or combined with phosphate-enriched compost（PEC） on the symbiotic（nodulation-N_2 fixation） performance of soybean（Glycine max（L.） Merr.） on an Aridisol.The PEC was produced by composting food waste with addition of single super phosphate.The bacterial strain B.cereus GS6 showed considerable potential for P solubilization and mobilization by releasing carboxylates in insoluble P（rock phosphate）-enriched medium.Inoculation of B.cereus GS6 in combination with PEC application significantly improved nodulation and nodule N_2 fixation efficiency.Compared to the control（without B.cereus GS6 and PEC）, the combined application of B.cereus GS6 with PEC resulted in significantly higher accumulation of nitrogen（N）, P, and potassium（K） in grain, shoot, and nodule.The N：P and P：K ratios in nodules were significantly altered by the application of PEC and B.cereus GS6, which reflected the important roles of P and K in symbiotic performance of soybean.The combined application of PEC and B.cereus GS6 also significantly increased the soil dehydrogenase and phosphomonoesterase activities, as well as the soil available N, P, and K contents.Significant positive relationships were found between soil organic carbon（C） content, dehydrogenase and phosphomonoesterase activities, and available N, P, and K contents.This study suggests that inoculation of P-mobilizing rhizobacteria, such as B.cereus GS6, in combination with PEC application might enhance legume productivity by improving nodulation and nodule N_2 fixation efficiency.

关 键 词：arid and semi-arid regions CARBOXYLATE N2 fixation NODULATION nutrient availability nutrient-poor soils plant growth-promoting rhizobacteria (PGPR) soil enzymes 

分 类 号：S565.1[农业科学—作物学]