|Zhang, T - ??????????????|
|Fick, G - SEEDS 2000, INC.|
Submitted to: Proceedings Sunflower Research Workshop
Publication Type: Proceedings
Publication Acceptance Date: February 29, 2000
Publication Date: N/A
Interpretive Summary: The vulnerability of using a single Helianthus petiolaris male-sterile cytoplasm (cms) for worldwide sunflower production has been recognized. None of the 62 cms sources reported are being used for sunflower hybrids, primarily due to the incomplete expression of some cms , and the difficulties of identifying simple and complete nuclear fertility restoration genes. This paper presents study of a cms source derived from perennial species H. rigidus (cms-RIG2) obtained from the former Soviet Union in 1988, with regard to its stability and expression, identification and inheritance of fertility restoration genes, and to compare it with another H. rigidus derived cms-RIG1. The cms-RIG2 was shown to be stable and expressed typical cms characteristics of no anther extrusion and no pollen production. Restoration genes were found in cultivated lines and complete fertility was restored by 2-complementary genes. The same genes restored both cms-RIG1 and cms-RIG2, suggesting the same cms of the two sources. These cms-RIG and restoration gene combinations provide additional sources for hybrid sunflower production.