|Gulya jr, Thomas|
Submitted to: Crop Science
Publication Type: Peer reviewed journal
Publication Acceptance Date: 3/14/2006
Publication Date: 7/1/2006
Citation: Jan, C.C., Gulya Jr, T.J. 2006. Registration of three virus resistant sunflower genetic stocks. Crop Science. 46:1834-1835. Interpretive Summary: Three sunflower genetic stocks, SuMV-1, SuMV-2, and SuMV-3 resistant to sunflower mosaic potyvirus (SuMV) were developed and released in 2005. The virus was reported on wild sunflower (Helianthus annuus L.) and cultivated sunflower in Texas, with no resistance identified in cultivated sunflower. These genetic stocks will provide sources of resistance should sunflower mosaic virus become an economic problem.
Technical Abstract: Three wild Helianthus annuus L. accessions from southern Texas, PI 435424, PI 435418, and PI 435437, were identified as having high frequencies of SuMV resistance in 2000, and subsequently used to create the genetic stocks. Resistant plants of each PI were crossed with an inbred line HA 89 (PI 599773), and the SuMV-resistant F1 plants backcrossed with HA 89. The resistant plants of BC1F1 were either sib-pollinated or backcrossed with HA 89, followed by self-pollination and selection of homozygous resistant families. SuMV1 is single-headed with a pedigree of PI 435424/2*HA 89// PI 435424/2*HA 89, F5 with black seed with grey stripes. SuMV2 is single-headed with a pedigree of PI 435418/3*HA 89, F4 with also black seed with grey stripes. SuMV3 is branched with a pedigree of PI 435437/2*HA 89// PI 435437/2*HA 89, F5, and segregating for grey-mottled and brown seeds. Plants in each generation were artificially inoculated and scored for resistance in the greenhouse. SuMV1, SuMV2, and SuMV3 are homozygous resistant to the SuMV. SuMV1, SuMV2, and SuMV3 flower in 80, 76, and 74 d after planting, have plant heights of 111, 101, and 81 cm, head diam. of 14.0, 12.6, and 3.7 cm, and 1000-seed weights of 44, 60, and 17 g, respectively. Self-pollinated seed set is 57, 70, and 32%, respectively, indicating varying degrees of self-incompatibility.