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Published in Crop Sci 16:395-399 (1976)
© 1976 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Inheritance of Genic Sterility in Cultivated Safflower1

Jirair Carapetian and P. F. Knowles2

Vegetatively normal but reproductively sterile safflower (Carthamus tinctorius L.) plants were observed in segregating generations (F2, F3, BC1F2, and BC1F3) of crosses involving the cultivar ‘US-10’ and an introduction from India, 57-147. Seed heads appeared pinched because of shorter florets at anthesis and an absence of seeds.

Different methods of classification, namely, the morphological appearance of flowering heads, seed set under self- and open-pollination, and the morphology and stainability of pollen grains were used to identify the sterile plants under field and greenhouse conditions. Data strongly support the involvement of three unlinked nuclear genes in the inheritance of sterility. It is proposed that US-10 and 57-147, respectively, have the genotypes AAbbcc and aaBBCC. Sterility occurs when a homozygous recessive allele at the A locus interacts with a homozygous recessive allele at either the B or C locus. As expected, F2 families segregating at the three loci gave a good fit to a 57:7 (fertile:sterile) ratio in which the sterile genotypes are aabbC-, aaB-cc, and aabbcc.

Key Words: Gene interaction • Male sterility • Female sterility • Segregation • Carthamus tinctorius L.

1 Contribution from the Dep. of Agronomy and Range Science, Univ. of California, Davis, CA 95616. Part of a Ph.D thesis by the senior author.

2 Assistant professor of genetics and plant breeding, College of Agriculture, Rezaiyeh, Iran; and professor of agronomy, Univ. of California, Davis.

Received for publication August 2, 1975.




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