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Sclerotinia stem and head rot resistant germplasm development utilizing interspecific amphiploids
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Interspecific amphiploids have been confirmed as useful sources of resistance genes for both Sclerotinia stem rot and head rot based on our evaluations over two years, 2005 and 2006. The interspecific amphiploids include crosses of wild perennial Helianthus gracilentus, H. hirsutus, H. strumosus, H. grosseserratus, H. maximiliani, and H. nuttallii, crossed with P21, plus one intercrossed amphiploid involving H. divaricatus and H. grosseserratus. The results indicated that most amphiploids have better stem rot and head rot resistance than the tolerant checks HA 410 and HA 441, respectively. The good F1 seed set between the amphiploids and HA 410 or HA 441 provided a sufficient number of plants for further backcrossing and chromosome reduction toward the 2n=34 of the cultivated sunflower.
Meeting held January 10-11, 2007, Fargo, ND.
Proceedings. Sunflower research workshop 2007, no. 29
Journal Articles, USDA Authors, Peer-Reviewed
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