Effects of Soil Moisture Content and Rj Genotype Differences on Soybean Productivity and Soybean-nodulating Bradyrhizobial Occupancy.

IF 2.6 4区环境科学与生态学 Q3 BIOTECHNOLOGY & APPLIED MICROBIOLOGY

Microbes and Environments Pub Date : 2026-01-01 DOI:10.1264/jsme2.ME25075

Soto Ito, Shingo Matsumoto, Masayuki Kadowaki, Hirokazu Sato, Yuichi Saeki, Sokichi Shiro

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Abstract

We exami-ned the effects of soil moisture changes on soybean growth, yield, and the structure of soybean-nodulating bradyrhizobial communities in cultivars with different Rj genotypes. The experiment was conducted using cultivation pots with soybean cultivars Bragg (non-Rj), CNS (Rj₂Rj₃), D-51 (Rj₃), and Fukuyutaka (Rj₄). Test strains included Bradyrhizobium diazoefficiens USDA 110^T, B. japonicum USDA 6^T and USDA 123, and B. elkanii USDA 31. Cultivation pots were built with 15-cm ridges, and three soil moisture conditions were generated by varying the presence and placement of drainage holes on the pots. Declining soil moisture significantly reduced shoot length, shoot dry weight, root dry weight, root length, nodule number, pod number, pod dry weight, and seed number. An occupancy anal-ysis showed that USDA 110 dominated Fukuyutaka only; across treatments, it was the most abundant under high soil moisture, but significantly declined with reductions in soil moisture, where USDA 31 became dominant. A non-metric multidimensional scaling anal-ysis revealed shifts in community compositions in response to soil moisture and cultivar. Collectively, these results indicate that soybean growth, yield, and symbiosis with bradyrhizobia are strongly affected by soil moisture and also that these effects vary among cultivars.

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土壤含水量和Rj基因型差异对大豆产量和大豆根瘤菌占用的影响

研究了土壤水分变化对不同Rj基因型大豆生长、产量和大豆根瘤菌群落结构的影响。本试验选用大豆品种Bragg（非rj）、CNS （Rj2Rj3）、D-51 （Rj3）和Fukuyutaka （Rj4）进行盆栽试验。试验菌株包括重氮效率慢生根瘤菌USDA 110T、日本芽孢杆菌USDA 6T和USDA 123、厄尔卡尼芽孢杆菌USDA 31。栽培盆以15厘米的垄沟建造，并通过改变盆上排水孔的存在和位置产生三种土壤湿度条件。土壤水分降低显著降低了茎长、茎干重、根干重、根长、根瘤数、荚果数、荚果干重和种子数。占用率分析显示，USDA 110只在福高占主导地位；在不同处理中，高土壤水分条件下其含量最高，但随着土壤水分的减少而显著下降，其中USDA 31占主导地位。非度量多维尺度分析揭示了土壤湿度和品种对群落组成的影响。总之，这些结果表明，大豆的生长、产量以及与慢生根瘤菌的共生受到土壤水分的强烈影响，而且这些影响因品种而异。

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来源期刊

Microbes and Environments 生物-生物工程与应用微生物

CiteScore

4.10

自引率

13.60%

发文量

审稿时长

3 months

期刊介绍： Microbial ecology in natural and engineered environments; Microbial degradation of xenobiotic compounds; Microbial processes in biogeochemical cycles; Microbial interactions and signaling with animals and plants; Interactions among microorganisms; Microorganisms related to public health; Phylogenetic and functional diversity of microbial communities; Genomics, metagenomics, and bioinformatics for microbiology; Application of microorganisms to agriculture, fishery, and industry; Molecular biology and biochemistry related to environmental microbiology; Methodology in general and environmental microbiology; Interdisciplinary research areas for microbial ecology (e.g., Astrobiology, and Origins of Life); Taxonomic description of novel microorganisms with ecological perspective; Physiology and metabolisms of microorganisms; Evolution of genes and microorganisms; Genome report of microorganisms with ecological perspective.