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<p>Yardlong bean (<i>Vigna unguiculata</i> subsp. <i>sesquipedalis</i>) is grown throughout the tropics, but the plant is very common in South-East Asia (e.g. Thailand), Southern China, Africa and South America. Farmers have frequently used pesticides while planting in order to avoid and eradicate pests and diseases. The application of biofertilizers containing growth-promoting and disease-suppressing microorganisms represents a sustainable and economically viable strategy for enhancing plant health and productivity. The aims of this study were (1) to screen for and identify antagonistic bacteria which can both control <i>Agroathelia rolfsii</i> (anamorph: <i>Sclerotium rolfsii</i> Sacc.), the cause of root rot disease, and promote growth of the yardlong bean, and (2) to produce granular biofertilizer amended with an antagonistic bacterium and assess its efficacy on the growth and yield of yardlong bean. The bacterium that inhibited <i>A. rolfsii</i>, had the capacity to solubilize phosphate, enhanced the growth of yardlong bean, and showed no antagonistic activity toward <i>Rhizobium</i> sp. TAL 638 – used as a representative surrogate for beneficial plant-associated bacteria – was identified as <i>Bacillus amyloliquefaciens</i> (HY 4–3-4). A granular biofertilizer was created incorporating this bacterium (at 8.99 × 10<sup>8</sup>&#xa0;CFU/g), which continued to be efficient in inhibiting the mycelial growth of <i>A. rolfsii</i> even after 16&#xa0;months of storage at 26–30&#xa0;°C. In pot experiments, the granular biofertilizer was effective at controlling root and stem rot of yardlong bean. The yardlong bean stem length, fresh and dry weight, and number of nodules on the roots were all increased by application of granular biofertilizer. In field experiments, the granular biofertilizer provided moderate disease control but was less effective than mancozeb, while significantly improving yield parameters.. Thus, employing biofertilizers may contribute to environmental sustainability by lowering the amount of chemicals used in growing yardlong bean.</p>

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Granular biofertilizer containing Bacillus amyloliquefaciens (HY 4–3-4) suppresses root rot disease and promotes growth of yardlong bean (Vigna unguiculata subsp. sesquipedalis)

  • 期刊论文

  • 发表日期：

    2026年5月6日

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  • Amornrat Chumthong,
  • Pongsak Mansuriwong,
  • Paranee Sawangsri,
  • Mana Kanjanamaneesathian

摘要

Yardlong bean (Vigna unguiculata subsp. sesquipedalis) is grown throughout the tropics, but the plant is very common in South-East Asia (e.g. Thailand), Southern China, Africa and South America. Farmers have frequently used pesticides while planting in order to avoid and eradicate pests and diseases. The application of biofertilizers containing growth-promoting and disease-suppressing microorganisms represents a sustainable and economically viable strategy for enhancing plant health and productivity. The aims of this study were (1) to screen for and identify antagonistic bacteria which can both control Agroathelia rolfsii (anamorph: Sclerotium rolfsii Sacc.), the cause of root rot disease, and promote growth of the yardlong bean, and (2) to produce granular biofertilizer amended with an antagonistic bacterium and assess its efficacy on the growth and yield of yardlong bean. The bacterium that inhibited A. rolfsii, had the capacity to solubilize phosphate, enhanced the growth of yardlong bean, and showed no antagonistic activity toward Rhizobium sp. TAL 638 – used as a representative surrogate for beneficial plant-associated bacteria – was identified as Bacillus amyloliquefaciens (HY 4–3-4). A granular biofertilizer was created incorporating this bacterium (at 8.99 × 108 CFU/g), which continued to be efficient in inhibiting the mycelial growth of A. rolfsii even after 16 months of storage at 26–30 °C. In pot experiments, the granular biofertilizer was effective at controlling root and stem rot of yardlong bean. The yardlong bean stem length, fresh and dry weight, and number of nodules on the roots were all increased by application of granular biofertilizer. In field experiments, the granular biofertilizer provided moderate disease control but was less effective than mancozeb, while significantly improving yield parameters.. Thus, employing biofertilizers may contribute to environmental sustainability by lowering the amount of chemicals used in growing yardlong bean.