Inheritance of Resistance in Sorghum to Three Pathotypes ofPeronosclerospora sorghi

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Abstract
The F1, F2, and F3 generations of the cross of sorghum inbred line SC 414-12 (which is resistant to pathotypes 1, 2, and 3 of P. sorghi) and the universally susceptible sorghum line Tx 412 were used to determine inheritance of resistance to P. sorghi. In SC 414-12, resistance was expressed as an incompatible host pathogen interaction with inhibited pathogen development and sporulation in leaves inoculated with conidia of P. sorghi. The reactions of the parental lines and progenies to conidial inoculum of the three pathotypes supported the hypothesis that resistance of P. sorghi to these pathotypes was conferred by a single dominant gene. The F2 phenotypic ratios were 3 resistant: 1 susceptible; F2 genotypic ratios were 1 homozygous resistant: 2 heterozygous: 1 homozygous susceptible.