A new gene for virescence character in rice

17. A new gene for virescence character in rice A.C. SANCHEZ and G.S. KHUSH International Rice Research Institute, Manila, Philippines We observed a spontaneous virescent mutant in the rice cultivar Angasan planted in our hybridization nursery. The seedlings exhibit fine white stripes which disappear before transplanting (21 days after seeding). The white stripes appear again on the leaf sheaths of flagleaf at flowering. The uppermost internode which bears the panicle is milky white in color. We crossed the mutant with 1R36 and F1 plants were normal. The F2 population segregated into 76 normal to 20 virescent plants. Thus, the virescence character is due to a single recessive gene. We made allele tests with the other mutants of similar phenotype: 11 known virescence mutants, 2 known fine stripe mutants, the rfs mutant, and 8 known striped leaf mutants (Kinoshita, 1995). The F1 plants of all hybrids were normal (Table 1). The new gene is designated as v12(t). Reference Kinoshita, T., 1995. Report of Committee on Gene Symbolization, Nomenclature, and Linkage Groups. RGN 1:9-115.

We observed a spontaneous virescent mutant in the rice cultivar Angasan planted in our hybridization nursery. The seedlings exhibit fine white stripes which disappear before transplanting (21 days after seeding). The white stripes appear again on the leaf sheaths of flagleaf at flowering. The uppermost internode which bears the panicle is milky white in color. We crossed the mutant with 1R36 and F1 plants were normal. The F2 population segregated into 76 normal to 20 virescent plants. Thus, the virescence character is due to a single recessive gene. We made allele tests with the other mutants of similar phenotype: 11 known virescence mutants, 2 known fine stripe mutants, the rfs mutant, and 8 known striped leaf mutants (Kinoshita, 1995). The F1 plants of all hybrids were normal (Table 1). The new gene is designated as v12(t).