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      https://www.ias.ac.in/article/fulltext/jgen/099/0089

    • Keywords

       

      gene action; genetic effects; generation mean analysis; inheritance pattern; maize; maydis leaf blight; resistance breeding; Cochliobolus heterostrophus.

    • Abstract

       

      Knowledge on the genetics of maydis leaf blight (MLB) is crucial to breed the resistant maize cultivars to combat diseaseepidemics as a sustainable and cost-effective approach. The present investigation was framed to understand the genetics of MLB resistancein subtropical maize. Two contrasting genotypes CM119 (susceptible) and SC-7-2-1-2-6-1 (resistant) were used to generate six geneticpopulations, namely P1, P2, F1, F2, BC1P1 and BC1P2, and evaluated in three target environments for MLB resistance under artificialepiphytotic condition. The CM119 and SC-7-2-1-2-6-1 showed susceptible and resistant reactions with mean disease reaction of 3.89–3.98and 1.88–2.00, respectively. The derived generations, namely F1, F2, BC1P1 and BC1P2 showed mean disease reaction of 2.15–2.28,2.44–2.51, 2.19–2.24 and 2.22–2.28, respectively in the test locations. The segregating generations (F2: 0.35–0.37; BC1P1: 0.24–0.29 andBC1P2: 0.17–0.20) showed variation for MLB disease resistance over the parental and first filial generations (P1: 0.11–0.17; P2: 0.08–0.13and F1: 0.12–0.14). The genetic analysis of MLB resistance revealed the nonallelic interactions of duplicate epistasis type across the testlocations. Among the gene interactions, dominance 9 dominance [l] effect was predominant over additive 9 additive [i] and additive 9dominance [j] effects. The segregation analysis and the prediction of the number of major loci revealed at least two major genes associatedwith MLB tolerance in subtropical maize. Our investigation paved the foundation for the improvement of subtropical maize germplasm ofMLB resistance.

    • Author Affiliations

       

      B. JEEVAN1 2 ROBIN GOGOI1 DEVENDER SHARMA2 C. MANJUNATHA1 3 H. RAJASHEKARA1 2 DAMA RAM1 4 K. K. MISHRA2 M. G. MALLIKARJUNA5

      1. Division of Plant Pathology, ICAR-Indian Agricultural Research Institute, New Delhi 110 012, India
      2. ICAR-Vivekananda Parvatiya Krishi Anusandhan Sansthan, Almora 263 601, India
      3. Regional Station, ICAR-Indian Agricultural Research Institute, Wellington (Nilgiris) 643 231, India
      4. College of Agriculture, Agriculture University, Jodhpur 342 304, India
      5. Division of Genetics, ICAR-Indian Agricultural Research Institute, New Delhi 110 012, India
    • Dates

       
  • Journal of Genetics | News

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