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Inheritance of Male Sterility in Safflower¹

Genetic male sterility was found in safltower (Carthamus tinctorius L.) plants from USDA Plant Introduction (PI) 253914 from Afghanistan. The male-sterile character was first observed in progeny of normal plants of PI 253914 that had been treated with colchicine. Male sterility was controlled by a single recessive nuclear gene, ms. Plants that were homozygousf or ms were completely male sterile and were not influenced by cytoplasmic factors. The ms gene did not adversely affect female fertility. Whole plant seed yield of open-pollinated male-sterile plants of PI 253914 did not significantly differ from that of adjacent male fertile plants. The number of seeds in open-pollinated male-sterile plants was reduced, but individual seeds were larger. Germplasm carrying the ms has been released as UC-148 and UC-149.

Key Words: Colchicine-induced mutation • Random mating population • Hybrid seed production • Recessive nuclear gene

² Director of research, SeedTec International, Inc., Box 2210, Woodland, CA9 5695; and professor, Dep. of Agronomya nd Range Science, Univ. of California, Davis, CA 95616.

Received for publication April 20, 1981.