Significant increase in sunflower meal protein content could be achieved by a decrease in seed crude fibre through seed dehulling before oil extraction. In order to evaluate the presence of genetic variability suitable for the establishment of a breeding programme to improve the character of hullability, crosses were made in 1989–1990 among eleven randomly chosen inbred sunflower lines, according to a diallelic schema. In the following growing season the 55 F1 hybrids obtained and the eleven parental lines were sown according to a randomized block design with three replications. The following characters were determined: achene yield, weight of 1000 achenes, % achene oil and hull (HC), mechanical hull extraction (FH) and hullability (H) obtained from the ratio FH/HC. Analysis of variability of the character demonstrated that both additive and non-additive variability were significant with moderate heritability in a narrow sense. Hullability is shown to have a strongly positive correlation with mechanical hull extraction and with % achene hull. The biological negative correlation existing between % achene hull and % achene oil leads to serious complications in selection for high hullability without decreasing oil yield. A very promising inbred line (L3) was identified, with positive GCA effects for hullability, oil content and seed yield, suggesting new breeding strategies to overcome the barriers in simultaneous improvement of the above characters. A genetic improvement programme must therefore take into account both intrinsic parental characteristics (GCA) and also those of the different hybrid combinations (SCA). Furthermore, a very useful contribution to hullability could come from a global study in which genetic effects are considered together with effects linked to the mechanical process, pedoclimatic conditions, crop management techniques and possible interaction between these factors.

Genetic analysis of hullability in sunflower.

BONARI, Enrico;
1994-01-01

Abstract

Significant increase in sunflower meal protein content could be achieved by a decrease in seed crude fibre through seed dehulling before oil extraction. In order to evaluate the presence of genetic variability suitable for the establishment of a breeding programme to improve the character of hullability, crosses were made in 1989–1990 among eleven randomly chosen inbred sunflower lines, according to a diallelic schema. In the following growing season the 55 F1 hybrids obtained and the eleven parental lines were sown according to a randomized block design with three replications. The following characters were determined: achene yield, weight of 1000 achenes, % achene oil and hull (HC), mechanical hull extraction (FH) and hullability (H) obtained from the ratio FH/HC. Analysis of variability of the character demonstrated that both additive and non-additive variability were significant with moderate heritability in a narrow sense. Hullability is shown to have a strongly positive correlation with mechanical hull extraction and with % achene hull. The biological negative correlation existing between % achene hull and % achene oil leads to serious complications in selection for high hullability without decreasing oil yield. A very promising inbred line (L3) was identified, with positive GCA effects for hullability, oil content and seed yield, suggesting new breeding strategies to overcome the barriers in simultaneous improvement of the above characters. A genetic improvement programme must therefore take into account both intrinsic parental characteristics (GCA) and also those of the different hybrid combinations (SCA). Furthermore, a very useful contribution to hullability could come from a global study in which genetic effects are considered together with effects linked to the mechanical process, pedoclimatic conditions, crop management techniques and possible interaction between these factors.
1994
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11382/340788
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