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Published in Crop Sci 10:432-436 (1970)
© 1970 Crop Science Society of America
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Inheritance of Branching in Sunflowers, Helianthus annuus L.1

E. A. Hockett and P. F. Knowles2

The inbred parental lines in this study were derived from varieties of sunflowers grown for their large edible seed (Helianthus annuus var macrocarpus (DC.) Ckll.) and from the wild type H. annuus ssp. annuus.

A classification using the following types was found to be adequate for genetic studies of branching in sunflowers: 0 - no branching, 1 - basally branched, 2 - top branched, 3 - fully branched with a central head, 4 - fully branched without a central head (wild type).

Four genes for branching were named in this study: the dominant gene Br2 for top branching; the duplicate dominant genes Br2 and Br3 from the wild type parent; and the recessive genes b2 and b3 which gave a fully branched phenotype only when homozygous for both genes.

The single gene Y for green versus yellow growing point color was found to be linked with the gene Br3 for branching with 11.6 ± 1.0% recombination.

Key Words: Linkage • Chlorotic growing point

1 Contribution from the Agronomy Department, University of California, Davis, Calif. 95616. Part of a dissertation submitted by the senior author in partial fulfillment of the requirements of the Ph.D. degree. The investigation was supported in part by a research grant from Taylor-Walcott Co.; C. M. Volkman Co.; Manteca Warehouse; Paramount Seed Co.; and Northrup, King and Co.

2 Former graduate student (present address: Crops Research Division, Agricultural Research Service, U. S. Department of Agriculture, Montana State University, Bozeman, Mont. 59715) and Professor or Agronomy, University of California, Davis, Calif. 95616.

Received for publication February 18, 1970.


This article has been cited by other articles:


Home page
 GeneticsHome page
J. M. Burke, S. Tang, S. J. Knapp, and L. H. Rieseberg
Genetic Analysis of Sunflower Domestication
Genetics, July 1, 2002; 161(3): 1257 - 1267.
[Abstract] [Full Text] [PDF]


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