Influence of Sowing Dates on Yield and Oil Content in Flax Diallel Crosses

Mostafa Nagah, Ahmed Osama

doi:10.36531/ijds.2025.164831.1105

	Influence of Sowing Dates on Yield and Oil Content in Flax Diallel Crosses
IRAQI JOURNAL OF DESERT STUDIES
Volume 15, Issue 2, December 2025, Pages 7-21 PDF (899.99 K)
Document Type: Research Paper
DOI: 10.36531/ijds.2025.164831.1105
Author
Ahmed Osama Mostafa Nagah^*
Department of Agronomy, Faculty of Agriculture, Zagazig University, Zagazig 44519, Egypt
Abstract
Thirty-six entries of flax (Linum usitatissmum, L.) involving eight parental genotypes and their twenty-eight hybrids were evaluated for grain yield and its related traits and oil percentage in the F1 and F2 populations under early and late sowing dates in the Agricultural Research Station, Faculty of Agriculture, Ain Shams University, Shalakan, Kalubia Governorate. Highly significant variations were found for parental genotypes and hybrids for all studied traits in the F1, F2D1and F2D2, indicate presence of wide genetic variability among studied genotypes. General and specific combining ability mean squares were highly significant for seed yield/plant and their related characters in F1, F2D1 and F2D2 with the exception of a few cases, indicating the importance of both additive and non-additive gene effects in the expression of seed yield and its components. Additive effects were more important than non-additive ones under all studied environments for number of fruiting branches per plant, number of capsules per plant, 1000-seed weight and oil percentage. On the other hand, the non-additive effects were more effective than additive effects for no. of seeds/capsule and harvest index. Some parents appeared to be the best general combiner under all respective environments for some studied traits. Some of the crosses exhibited highly significant and positive SCA effects included high × high and high × low general combiner parents, suggesting that breeding procedure utilizing both additive and non-additive genetic variances would be more effective for improvement of seed yield and its components of flax.
Keywords
Flax; performance; combining ability; gene action; sowing dates

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