Abstract
Studies of open‐pollinated and hybrid sunflower (Helianthus annuus L.) varieties showed a positive correlation of seed (achene) oil content with days to 50% flowerng, plant height, and test weight, and a negative correlation with rust reaction under moderate to severe rust conditions. No association of oil content with seed yield or seed weight was apparent. Oil content of inbred lines was negatively correlated with seed weight, but showed no correlation with 50% flowering, plant height, rust reaction, plant leafiness, head diameter, or head inclination. No differences in oil content were detected among individual F2 plants with different genotypes for fertility restoration, resistance to rust, or resistance to downy mildew. Fertility restoration and resistance to rust and downy mildew are traits introduced from wild sunflowers with relatively low oil content, and the lack of association suggests that these traits can be readily incorporated into high‐oil genotypes. An increase in oil content of about 2.5% was noted for seed from branched F2 plants, as compared to single‐headed types.
Published Version
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