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<p>Soybean expansion and heavy rainfall during pod filling have intensified <i>Rhizoctonia</i> aerial blight (RAB) in India. Identifying resistant genotypes with strong agronomic traits offers a sustainable alternative to fungicide-dependent management under climate variability. In this study, 1,400 diverse soybean genotypes were evaluated under favourable conditions to assess resistance to RAB. From these, a subset of 63 resistant soybean genotypes was further evaluated under epiphytotic field conditions to assess RAB resistance and key agronomic traits, including yield. The selected genotypes were further screened using a soil inoculation technique to evaluate RAB resistance and their ability to retain root and shoot biomass. Integrated field and controlled evaluations identified EC 456,613, EC 456,647, EC 457,052, UPSL 50,981, IC 073710, and UPSM 117 as promising RAB resistance donors. These genotypes retained &gt; 65% root and &gt; 75% shoot biomass under <i>Rhizoctonia solani</i> challenge and showed significantly elevated defense enzyme activities. The weak negative association of resistance with reproductive traits, but not vegetative traits, indicates a stronger impact of RAB during reproductive stages. This trade-off and the absence of a universally superior genotype highlight the need for multi-trait selection to achieve durable, balanced soybean improvement. For the first time, multivariate analyses identified EC 528,628, EC 528,622, UPSL 390, and Cat 734 as stable superior genotypes combining agronomic performance and RAB resistance. The resistant, high-performing lines identified here provide a foundation for mapping genes/QTLs and introgressing RAB resistance into elite cultivars.</p>

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Integrating disease resistance and agronomic traits: multivariate selection of soybean genotypes against Rhizoctonia aerial blight

  • 期刊论文

  • 发表日期：

    2026年8月5日

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  • Asha Yadav,
  • Laxman Singh Rajput,
  • Sanjeev Kumar,
  • Rakesh Kumar Singh,
  • Sanjay Gupta,
  • Rajesh Vangala,
  • Hemant Singh Maheshwari,
  • Kunwar Harendra Singh

摘要

Soybean expansion and heavy rainfall during pod filling have intensified Rhizoctonia aerial blight (RAB) in India. Identifying resistant genotypes with strong agronomic traits offers a sustainable alternative to fungicide-dependent management under climate variability. In this study, 1,400 diverse soybean genotypes were evaluated under favourable conditions to assess resistance to RAB. From these, a subset of 63 resistant soybean genotypes was further evaluated under epiphytotic field conditions to assess RAB resistance and key agronomic traits, including yield. The selected genotypes were further screened using a soil inoculation technique to evaluate RAB resistance and their ability to retain root and shoot biomass. Integrated field and controlled evaluations identified EC 456,613, EC 456,647, EC 457,052, UPSL 50,981, IC 073710, and UPSM 117 as promising RAB resistance donors. These genotypes retained > 65% root and > 75% shoot biomass under Rhizoctonia solani challenge and showed significantly elevated defense enzyme activities. The weak negative association of resistance with reproductive traits, but not vegetative traits, indicates a stronger impact of RAB during reproductive stages. This trade-off and the absence of a universally superior genotype highlight the need for multi-trait selection to achieve durable, balanced soybean improvement. For the first time, multivariate analyses identified EC 528,628, EC 528,622, UPSL 390, and Cat 734 as stable superior genotypes combining agronomic performance and RAB resistance. The resistant, high-performing lines identified here provide a foundation for mapping genes/QTLs and introgressing RAB resistance into elite cultivars.