ESTIMATION OF COMBINING ABILITY FOR EIGHT FLAX GENOTYPES UNDER SANDY SOIL CONDITIONS | ||||
| Journal of Plant Production | ||||
| Article 5, Volume 6, Issue 3, March 2015, Page 323-335 PDF (498.5 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/jpp.2015.49322 | ||||
 View on SCiNiTO | ||||
| Authors | ||||
| R. A. Abd El-Haleem; Maysa S. Abd Al-Sadek | ||||
| Fiber Crops Res. Dep., Field Crops Res .Inst., A.R.C., Giza | ||||
| Abstract | ||||
| This study aimed to estimate the combining ability and gene action for eight flax genotypes under sandy soil conditions. This was achieved via evaluating the eight parents and their 16 F1,s progenies. The eight parents consisting of four females (P1= S.541-C/6, P2= S.402/1, P3= S.813, and P4= S.997) and four males (P5= Sakha 3, P6= S.541-C/7, P7= Sozana and P8= S.541-D/4). In 2013/14 season, each of the four male parents was crossed to the four female parents to obtain 16 F1 crosses at the breeding nursery of Fiber Crops Res. Section, ARC at Giza. In 2014/15 season, the parents and their 16 F1,s seeds were evaluated in Ismailia Exp. Station, Ismailia Governorate. The experiment was laid out in a randomized complete block design with four replications. The collected data indicated that the values of additive and dominance as well as, the ratio of GCA/SCA indicated that additive played greater role than non-additive gene effects in the inheritance of straw yield per plant, plant height, technical stem length, no. of basal branches and 1000-seed weight. Therefore, selection should be possible within the F2 and subsequent populations for these characters. On the other hand, the ratio of GCA/SCA revealed that non-additive played greater role than additive gene effects in the inheritance of seed weight per plant, no. of capsules per plant and no. of seeds per capsule. P1 and P5 among parents were outstanding as they showed significant desirable combining ability for straw yield per plant and in most important components as well as P5 for technical stem length and P8 for both straw yield per plant and no. of basal branches per plant. On the other hand, P1 and P8 among parents are good general combiners for seed yield and most of its components, indicating that the use of these parents in flax breeding programs could be increase the above mentioned treats. Only one cross (P4xP5) exhibited significant positive SCA effects for straw yield and its components as well as this cross included high x low general combiner parents for straw yield per plant and two important components, plant height and technical stem length. Also, one cross (P1xP5) for both plant height and technical stem length, in addition one cross (P1xP6) for both straw yield/plant and plant height included high x high general combiner parents. For seed yield, three crosses (P1xP5, P1xP6 and P4xP8) exhibited significant positive SCA effects for seed yield per plant and no. of capsules per plant as well as high x low general combiner parents. Also, three crosses (P1xP5, P1xP7 and P4xP8) exhibited significant positive SCA effects for no. of seeds per capsule included high x low general combiner parents. While, out of the previous crosses, three crosses (P1xP5, P1xP6 and P4xP8) only included high x high general combiner parents for 1000-seed weight. These crosses were involved one good combiner parent, which indicated that such combinations are expected to throw desirable transgressive segregates. It could be concluded that the above mentioned crosses would be interesting and prospective for the future in flax breeding program for improving seed yield and straw yield and their components. | ||||
| Keywords | ||||
| line x tester; Combining ability; gene action; Flax | ||||
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