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首页> 外文期刊>African Journal of Microbiology Research >Nodulation efficacy of Bradyrhizobium japonicum inoculant strain WB74 on soybean (Glycine max L. Merrill) is affected by several limiting factors
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Nodulation efficacy of Bradyrhizobium japonicum inoculant strain WB74 on soybean (Glycine max L. Merrill) is affected by several limiting factors

机译：日本根瘤菌根瘤菌接种菌株WB74对大豆（Glycine max L. Merrill）的结瘤功效受几个限制因素的影响

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摘要

Lack of indigenous soil rhizobia that colonize and nodulate soybean (Glycine max L. Merrill) roots is a common problem of South African soils. Bradyrhizobium japonicum strain WB74 has long been used as an effective commercial inoculant strain for soybean since its introduction in 1998. This paper investigates the major limiting factors involved in the nodulation efficiency of B. japonicum WB74 that affect soybean growth and yield in South Africa. Methods including analysis of soil physicochemical properties, farmers’ management practices and quality control tests of locally manufactured inoculant products were employed. Inoculant’s strain verification was conducted using phylogenetic analysis of the 16S ribosomal RNA of the Bradyrhizobium strains in each of the inoculant product. The major findings of this study is that nodulation failure of introduced B. japonicum is caused by a combination of several limiting factors such as acidic nature of the soils as well as poor soil nutrition status especially that of phosphorous. Nodulation failure was also prominent in the soybean farms where there was no proper soil management practice. Results of the viability and shelf life studies also indicate that nodulation failure is caused by using sub-standard soybean inoculants products available on the market.
机译：缺乏能够在大豆根部定居和结实的本地土壤根瘤菌是南非土壤的普遍问题。自从1998年引入日本根瘤菌以来，WB74长期以来就一直被用作有效的商业接种菌菌株。方法包括土壤理化特性分析，农民管理实践和本地生产的孕育剂产品的质量控制测试。接种物的菌株验证是通过对每种接种物产品中的缓生根瘤菌菌株的16S核糖体RNA进行系统发育分析来进行的。这项研究的主要发现是，引入的日本血吸虫的结瘤失败是由多种限制因素共同造成的，例如土壤的酸性性质以及不良的土壤营养状况，尤其是磷。在没有适当土壤管理措施的大豆农场，结瘤失败也很突出。可行性和保质期研究的结果还表明，结瘤失败是由于使用市场上不合格的大豆接种剂产品引起的。

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