2株根际促生菌对油葵农艺性状、品质及土壤理化性质的影响OA

This study aimed to investigate the effects of two strains of plant growth-promoting rhizobacteria(PGPR)on the rhizosphere environment,agronomic traits,and quality characteristics of oil sunflower.A field experiment was conducted with two PGPR inoculants(Kocuria rosea SDB9 and Brevibacterium frigoritolerans SDB5),and a non-inoculated treatment was taken as the control(CK).The results showed that SDB5 significantly increased the stem diameter,number of leaves,disk diameter,single disk grain weight,and yield.SDB5 had the yield 13.08%higher but the crude protein content of kernels 6.42%lower than CK.SDB9 significantly increased the crude fat and crude protein content of kernels by 10.66%and 5.12%,respectively,while its yield-increasing effect was limited.Application of both PGPR strains significantly reduced soil pH value and increased soil electrical conductivity,the content of organic matter,alkali-hydrolyzable nitrogen,available phosphorus,and available potassium,and the activities of some soil enzymes.SDB9 demonstrated superior effects in enhancing sucrase,catalase,and neutral phosphatase activities.The results indicated that both PGPR strains could optimize rhizosphere soil environment and improve the agronomic traits and yield of oil sunflower but there were differences in their functional advantages.Specifically,SDB5 significantly enhanced the agronomic traits and yield of oil sunflower,while SDB9 improved the nutritional quality of oil sunflower kernels.