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Inheritance of Seedling Resistance to Gray Mold in Kenaf¹

Gray mold, caused by Botrytis cinerea Pers. ex Fr., is a potentially serious disease of kenaf (Hibiscus cannabinus L.) which usually attacks in the fall under cool temperatures and high humidity and can cause loss of an entire stand under epiphytotic conditions. Previous data indicate that strains highly susceptible to gray mold in the greenhouse as 1-week-old seedlings would demonstrate some level of field susceptibility as mature plants. However, the resistant reactions in seedlings and mature plants are not strongly related. Inheritance of resistance to gray mold was studied in the laboratory in 1-week-old S₁, F₁, backcross, and F₂ progenies tracing to three parents. Progenies were inoculated with Botrytis cinerea (300 000 spores/seeding), maintained in moisture-saturated atmosphere at 15°C for 72 h, incubated for 2 weeks at 10°C, then evaluated. Data indicate that resistance was conditioned by two genes; the genotype R __s produced the resistant phenotype and R__S__, rrS__, and rrss the susceptible. It is hypothesized that resistance is conditioned by R and is completely dominant to susceptibility (r); however, S (completely dominant to s) supresses the expression of R. High penetrance and simple inheritance of the susceptible reaction indicates that the laboratory technique could be used effectively for early elimination of plants that would be susceptible in the field.

Key Words: Hibiscus cannabinus L. • Botrytis cinerea Pers. ex Fr. • Gray mold • Kenaf • Disease

² Research agronomist, Germplasm Resources Lab. Plant Genetics and Germplasm Inst. USDA-ARS, Beltsville Agric. Res. Ctr., Beltsville, MD 20705.

Received for publication June 30, 1983.