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Accueil du site → Doctorat → Inde → 2012 → Inheritance, Genetic Variability and Marker Detection for Rust Resistance in Groundnut (Arachis hypogaea L.)

University of Agricultural Sciences, Dharwad (2012)

Inheritance, Genetic Variability and Marker Detection for Rust Resistance in Groundnut (Arachis hypogaea L.)

Shridevi A. Jakkeral

Titre : Inheritance, Genetic Variability and Marker Detection for Rust Resistance in Groundnut (Arachis hypogaea L.)

Auteur : Shridevi A. Jakkeral

Université de soutenance : University of Agricultural Sciences, Dharwad

Grade : Doctor of Philosophy (PhD) 2012

Résumé
A study was conducted to understand the inheritance of resistance to rust disease in groundnut during 2009-2012. GPBD-5, a bold seeded, high yielding variety but susceptible to rust disease was crossed to GPBD-4 and ICGV 86699 that are resistant to rust disease. The F1, F2 and F3 populations of four crosses were evaluated along with parents for resistance to rust disease under artificial epiphytotic condition. The study indicated that rust resistance in host plant is controlled by single recessive gene. The direct (F2) and backcross (BC1F2, BC2F2 and BC3F2) populations developed in both crosses were evaluated for transgressive segregation and subsequently derived F6, BC1F4, BC2F3 and BC3F2 populations were evaluated for productivity and its component traits, along with resistance. There was high genetic variability for the traits studied and resulted in identification of recombinants that were high yielding and resistant to rust disease. Further, attempts were made to identify SSR markers linked to rust resistance. Out of 135 SSR markers screened for parental polymorphism, 36 were polymorphic and two of them TC5A06 and TC4g10 are cosegregated with rust resistance. Study of components of rust resistance in selected rust resistant lines derived from direct and backcross populations revealed significant genotypic variation for component traits and mean rust score viz., incubation period, number of postules, sporulation index, leaf area damage and ruptured postules. All the components evaluated were significantly and positively correlated except incubation period that had negative and significant correlation with other resistance components. Similarly mean rust scores were negatively correlated with incubation period and positively correlated with other resistance component. Study indicated that incubation period, sporulation index and leaf area damage were important components of rust resistance that can help in to identification of resistant lines.

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