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Published in Crop Sci 15:724-726 (1975)
© 1975 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Fertility Restoration of Male-Sterile Cytoplasm in Wild Sunflowers1

Juan Dominguez Gimenez and Gerhardt N. Fick2

Wild sunflower (Helianthus spp.) populations, collected from the northern Great Plains, were evaluated in crosses with a cytoplasmic male-sterile inbred line to determine the frequency of fertility restorer genes in wild annual species and obtain information on the inheritance of fertility restoration. All of 52 H. annuus L. and six of seven H. petiolaris Nutt. populations were found to possess dominant genes for fertility restoration. Segregation ratios of male-fertile to male-sterile plants in the BC1 and F2 generations of seven crosses suggested that four genes were involved, and that fertility was restored when at least two dominant alleles were present at any of the four loci. Segregation occurred for one gene in four crosses, three genes in two crosses, and possibly four genes in one cross. Although the wild sunflower populations used in this study cannot be used directly as restorers in commercial production of hybrids, lines with acceptable agronomic characteristics were identified after one and two backcrosses to cultivated types.

Key Words: Helianthus annuus L. • Helianthus petiolaris Nutt. • Cytoplasmic male-sterility • Fertility restoring genes • Hybrid sunflowers

1 Contribution from the ARS, USDA, and the Agric. Exp. Stn., N.D. State Univ., Fargo, ND 58102. Published as journal paper no. 583 of the N.D. Agric. Exp. Stn.

2 Former IRI research fellow, Dep. of Agron., N.D. State Univ. (present address: INIA Centro Regional de Andalucia, Apartado 240, Cordoba Spain) and research geneticist, ARS, USDA, Fargo, ND 58102.

Received for publication March 26, 1975.




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