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Effect of Pea Seed Genotype on Preemergence Damping-Off and Resistance to Fusarium and Pythium Root Rot¹

Pea (Pisum sativum L.) lines, isogenic for the major A gene in various combinations with the genes F, Pl, M, I, and R were developed and tested for emergence and root rot resistance in soils infested with Fusarium and Pythium. Lines homozygous for A had significantly better emergence than a counterparts, presumably due to the fungistatic effects of phenols associated with anthocyanin pigmentation. Significantly lower root rot scores were noted in one test for the A isolines as compared to their a counterparts. The M gene appeared to give better emergence in the presence of either A or a Genes F, M, I, and R in the presence of A and a had a cumulative effect in reducing scores for pre-emergence damping-off and root disease.

Key Words: Seedcoat pigmentation • Disease resistance • Fungistasis

² Research geneticist, ARS, USDA, Pullman, WA 99164, and Research Plant Pathologist, ARS, USDA, Prosser, WA 99350.

Received for publication March 29, 1977.