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<p>Genetic diversity and durability stand as the paramount attributes within global wheat improvement initiatives towards rust resistance. A study was undertaken to characterize sources of slow rusting genes, aiming to identify new donors of slow rusters with different gene combinations in the high yielding background. Forty-eight advanced genotypes from different wheat producing zones of India were evaluated for leaf rust incidence under epiphytotic and normal condition. Four slow rusting genes (<i>Lr34</i>,<i> Lr46</i>,<i> Lr67</i> and <i>Lr68</i>) were characterized based on non-race specific interactions. In general, gene based average AUDPC value ranged from 92.20 (<i>Lr34</i>) to 584.64 (<i>Lr67</i>). The diversified occurrence of various minor genes indicated more strategically devised gene deployment in wheat growing zones in recent years to minimize yield losses. The gene <i>Lr46</i> appeared more frequently in the genotypes followed by <i>Lr68</i> and <i>Lr67</i>. Present investigation enabled identification of two new slow rusting genotypes DBW17 (<i>Lr34 + Lr67+Lr68</i>) and UP262 (<i>Lr34 + Lr46+Lr68</i>) with new minor gene combinations in addition to the well-known slow rusting genotypes Parula.</p>

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Pathogenic investigations and molecular analysis of adult plant resistance for identification of new slow rusting sources of leaf rust (Puccinia triticina) in wheat

  • 期刊论文

  • 发表日期：

    2026年3月9日

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  • Suma S. Biradar,
  • Sneha G. Lakkanagoudar,
  • Mahalaxmi K. Patil,
  • S. A. Desai,
  • S. K. Singh,
  • K. J. Yashwanthkumar,
  • Lalita G. Jaggal,
  • I. K. Kalappanavar

摘要

Genetic diversity and durability stand as the paramount attributes within global wheat improvement initiatives towards rust resistance. A study was undertaken to characterize sources of slow rusting genes, aiming to identify new donors of slow rusters with different gene combinations in the high yielding background. Forty-eight advanced genotypes from different wheat producing zones of India were evaluated for leaf rust incidence under epiphytotic and normal condition. Four slow rusting genes (Lr34, Lr46, Lr67 and Lr68) were characterized based on non-race specific interactions. In general, gene based average AUDPC value ranged from 92.20 (Lr34) to 584.64 (Lr67). The diversified occurrence of various minor genes indicated more strategically devised gene deployment in wheat growing zones in recent years to minimize yield losses. The gene Lr46 appeared more frequently in the genotypes followed by Lr68 and Lr67. Present investigation enabled identification of two new slow rusting genotypes DBW17 (Lr34 + Lr67+Lr68) and UP262 (Lr34 + Lr46+Lr68) with new minor gene combinations in addition to the well-known slow rusting genotypes Parula.