A field experiment was conducted at the Indian Institute of Pulses Research in Kanpur, Uttar Pradesh, India, during the rainy seasons of 2000 and 2001 to evaluate the inheritance of resistance to mungbean yellow mosaic virus (MYMV) in the F1, F2 and F3 populations of intervarietal crosses of black gram involving eight highly resistant cultivars (DPU 88-31, NP 21, PLU 710, PDU 6, IPU 98-8, UPU 85-86, UG 27, and DUS 19) and six susceptible cultivars (PDU 1, IPU 99-182, IPU 99-168, PGRU 95013, UH 80-38, and UH 82-2). The highly susceptible cultivar for MYMV, PDU 1, was used as the indicator-infector and was also sown all around in the field to increase the MYMV incidence. The plants were classified as symptomless (R), and susceptible with typical symptoms of mosaic (S) and necrosis (N). Plants showing necrosis or no symptoms were classified as resistant. Each F3 family was classified as resistant (homozygous), susceptible (homozygous), or segregating (heterozygous). Disease severity on F2 plants segregated 3:1 (resistant:susceptible; R:S) as expected for a single dominant resistant gene in all R/S crosses. The results of F3 analysis confirmed the presence of a dominant gene for resistance to MYMV.
v.37(2):85-89, SABRAO JOURNAL OF BREEDING AND GENETICS