VIEW ARTICLE

Resistance

Influence of Host Genotype on Uredospore Production and Germinability in Puccinia arachidis. P. Subrahmanyam, Plant pathologist, Groundnut Improvement Program, International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Patancheru P.O., Andhra Pradesh 502 324, India; D. McDonald(2), and P. V. Subba Rao(3). (2)(3)Principal plant pathologist, and technical assistant, respectively, Groundnut Improvement Program, International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Patancheru P.O., Andhra Pradesh 502 324, India. Phytopathology 73:726-729. Accepted for publication 21 December 1982. Copyright 1983 The American Phytopathological Society. DOI: 10.1094/Phyto-73-726.

Uredospore production by Puccinia arachidis was studied on inoculated detached leaves of one susceptible and five resistant genotypes of peanut (Arachis hypogaea). Significantly fewer uredospores were produced per unit leaf area and per unit pustule area on the resistant than on the susceptible genotypes. Germinability tests carried out on uredospores from three susceptible, one moderately resistant, and 15 resistant genotypes showed that uredospores from resistant genotypes had significantly lower germinability than those from the moderately resistant and the susceptible genotypes. The significance of uredospore production and germinability in relation to resistance is discussed.