Relationship between Components of Resistance to Late Leaf Spot in Groundnut Botanical Genotypes
Relationship between Components of Resistance to Late Leaf Spot in Groundnut Botanical Genotypes
Muhammad Ijaz, Sayed Rashad Ali Shah*, Muhammad Izhar-ul-Haq and Amir Afzal
ABSTRACT
Late leaf spot (LLS) is the most destructive, widespread, and consistent in occurrence disease of groundnut worldwide. LLS is the imperative factor while developing resistance varieties along with agronomic characteristics. In total, 153 groundnut botanically different genotypes namely Virginia, Spanish, and Valencia were screened under filed conditions and detached leaf assay against LLS pathogen. Most of genotypes during three years of study at early assessments under field conditions showed resistant response whereas, at late assessments most of genotypes were susceptible. In pathogen-host relationship several components of partial resistance have been proposed. Under detached leaf assay Virginia type groundnut showed minimum spots per leaf, sporulation, and product of spots per leaf and sporulation, spots per leaf and percent area diseased per leaf and spots per leaf and defoliation indices. Correlation between defoliation and spots per leaf are negative in Virginia (-0.12 to 0.22) and Spanish (-0.39 to 0.01), whereas positive in Valencia (0.17 to 0.78) were calculated. While positive correlation between multiple of spots per leaf and sporulation were computed.
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