Coffee Leaf Rust Resistance

Proc. XVI International Scientific Colloquium on Coffee

Kyoto (9th – 14th April 1995).pp.548-556.

NEW DIMENSIONS IN UNDERSTANDING INHERITANCE OF COFFEE RUST RESISTANCE: A MENDELIAN PERSPECTIVE

A. SANTA RAM

Literature on inheritance of resistance to coffee leaf rust is re-examined and lacunae in understanding the mechanism of inheritance are identified as lack of sound genetic assumptions and distorted genetic analysis on the basis of manifestation of resistance or susceptibility rather than actual genotype testing. Assumptions for genetic analysis of inheritance of resistance are laid down and their importance highlighted. The credibility and viability of the suggested model is elucidated by applying it to some of the already published results. The possibility of hitherto unrecorded genotypes of considerable breeding value residing in the progenies of differentials A-, H- and G-types is indicated. Incomplete resistance is indicated to be a Mendelian phenomenon and a manifestation of gene dose effect rather than a quantitative trait.

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