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<p>Common bean (<i>Phaseolus vulgaris</i>) is a promiscuous host nodulated by multiple rhizobial <i>taxa</i> and symbiovars. Accordingly, this study evaluated the host-range specificity of common bean <i>Rhizobium</i> isolates. Inoculation tests demonstrated that <i>Rhizobium</i> isolate PVJ5 is host-specific, nodulating exclusively <i>Phaseolus vulgaris</i>, but isolates PVJ8 and PVJ9 exhibit a broad host range, nodulating <i>Phaseolus vulgaris</i>, <i>Vigna umbellata</i>, and <i>Glycine max</i>. Concurrently, all three rhizobia promote the plant growth regardless of the nodulation condition. The <i>Rhizobium</i> isolates have phosphate solubilisation and phytohormone (auxin and gibberellic acid) production abilities. The identified <i>Rhizobium</i> has the potential to serve as a specific and broad host-range inoculum for usage as a consortia bioinoculant for <i>Phaseolus vulgaris</i> and other legumes.</p>

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Plant growth promoting Rhizobium isolates from common bean (Phaseolus vulgaris) root nodules exhibited host range variability

  • 期刊论文

  • 发表日期：

    2026年6月26日

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  • Bendangsenla Pongener,
  • Asosii Paul

摘要

Common bean (Phaseolus vulgaris) is a promiscuous host nodulated by multiple rhizobial taxa and symbiovars. Accordingly, this study evaluated the host-range specificity of common bean Rhizobium isolates. Inoculation tests demonstrated that Rhizobium isolate PVJ5 is host-specific, nodulating exclusively Phaseolus vulgaris, but isolates PVJ8 and PVJ9 exhibit a broad host range, nodulating Phaseolus vulgaris, Vigna umbellata, and Glycine max. Concurrently, all three rhizobia promote the plant growth regardless of the nodulation condition. The Rhizobium isolates have phosphate solubilisation and phytohormone (auxin and gibberellic acid) production abilities. The identified Rhizobium has the potential to serve as a specific and broad host-range inoculum for usage as a consortia bioinoculant for Phaseolus vulgaris and other legumes.