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Two field experiments were conducted at the experimental Farm of Etay ElBaroud, El-Beheira Governorate, Egypt. These trials included forty lines sown in F6 (in season, 2009/10) and F7 generation (in seasons, 2010/11). The objective of this investigation is to compare these lines through two generations with the two commercial varieties, Sakha 1 and Sakha 2 for straw, seed, oil yields and their related traits. These materials were evaluated in a randomized complete block design with three replications at the two previous seasons. Mean squares due to lines were significant for straw weight, seed weight and their components as well as for technological traits, fiber percentage and oil percentage in both seasons. Phenotypic (PCV) and genotypic (GCV) coefficient of variability and broad sense heritability (H%), the slight discrepancy between PCV and GCV for straw weight components (plant height, technical stem length and fiber percentage) and also for seed weight components (oil percentage and 1000-seed weight) were reflected in the high heritability estimates in both seasons for these traits, indicated the possibility of using these yield component traits in selection index technique to achieve further improvement both straw and seed weights by selection for these components. Concerning mean Performance, out of forty flax lines, five lines, (No. 18, 20, 34, 35, and No. 40) were superior for each seed, oil, straw and fiber yields/fed. Therefore, these five lines may be considered good substitutes for the low yielding ones, Sakha 1 and Sakha 2 in future after evaluation in more locations and years before releasing as a new Egyptian flax cultivar for both straw and seed yields production ( as a dual purpose type). Straw weight per plant was significantly positively correlated with each of plant height, technical stem length, number of capsules per plant and 1000-seed weight in both seasons. Also, plant height exhibited positive correlation with technical stem length in both seasons, indicating that maximization of straw weight per plant may be obtained by selection for these component variables specially plant height and technical stem length. Seed weight per plant, exhibited positive association with oil percentage in both seasons. Whereas, number of capsules per plant was highly positive correlation with 1000-seed weight, indicating the possibility of selection for a genotype as dual purpose type which had high seed weight and high straw components (plant height and technical stem length).

COMPARATIVE STUDY FOR YIELD AND YIELD COMPONENTS OF SOME FLAX LINES WITH THE TWO COMMERCIAL VARIETIES, SAKHA 1 AND SAKHA 2