DNA-based markers for a recessive gene conferring anthracnose resistance in sorghum

Resistance to anthracnose in sorghum [Sorghum bicolor (L.) Moench] accession SC326-6 was found to segregate as a simple recessive trait in a cross to the susceptible cultivar BTx623, F3 progeny tests following self pollination of 115 F-2 individuals identified homozygous resistant and susceptible F-2 plants for use in bulked-segregant analysis. DNA from the parental cultivars and the bulks was screened by PCR amplification with 300 RAPD (random amplified polymorphic DNA) primers. Two RAPD primers amplified a sequence that co-segregated with the recessive resistance allele, while another amplified a band linked to the susceptible allele.