COMBINING ABILITY AND GENE ACTION FOR YIELD AND YIELD COMPONENTS IN KENAF (HIBISCUS CANNABINUS L.) | ||
| Egyptian Journal of Agricultural Research | ||
| Article 14, Volume 85, Issue 2, July 2007, Pages 535-549 PDF (3.74 M) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/ejar.2007.214667 | ||
| Author | ||
| HOUSSEN M. H. ABO- KAIED | ||
| Field Crops Section, Field Crops Research Institute, Agricultural Research Center, Giza, Egypt | ||
| Abstract | ||
| This study was conducted with the objective of estimating combining ability and gene action for green stalk yield, fiber yield and their related characters in kenaf. This was achieved via evaluating six parents (P1=Giza3, P2=5.8, P3=5.103/4, P4=5.105/2, Ps-S.108/9 and P6 =S.116) and their 15 Fes progenies. In 2004 season, the six parents were crossed in a diallel mating design excluding reciprocals to obtain 15 F1 crosses at Giza Res. Sta. of Agric. Res. Center. In 2005 season, the six parents and their 15 Fes progenies were evaluated in a randomized complete block design with three replications at Ismailia Agric. Res. Station Farm, Ismailia Governorate, Egypt. The collected data indicated that the ratio of general to specific combining ability variance for plant height, technical stem length, fiber weight, fiber percentage, fiber length, seed weight, and fruiting zone length, indicated that the additive effects were more important than non-additive effects. Consequent, effects selection should be possible within these F2 and subsequent populations for these characters. On the other hand, for both of stem diameter and green weight per plant showed that the non-additive effects were more important than additive effects. For green weight, P4 exhibited significant and positive GCA effects for green weight per plant and the most of its components as well as PI and P3 for two important components (technical stem length and fiber length), indicating that the use of these parents in kenaf breeding programs could be increase green weight and consequent increasing fiber yield. For seed weight, the results indicated that P4 followed by P2 showed significant positive general combining ability values. The simple correlation between GCA Values and parental means for ail traits were significantly positive with exception stem diameter. These results indicated that the parents showing higher mean performance proved to be the highest general combiners for these traits. The cross (PixP4) exhibited significant and positive SCA effects for green weight per plant and the most of its components. This cross involved two parents of high x high GCA effects for both of technical stem length and fiber percentage. The cross (P3xP4) was exhibited the best second combiner for green weight and its three importance components (plant height, technical stem length and fiber weight). This cross (P3xP4) involved high x high general combiner parents for technical length and high x low for each of plant height, green weight and fiber weight per plant. For seed weight, one cross (P2xP4) only included high x high general combiner parents for all traits and three crosses (P2xP3, P2xP6 and P3xP5) included high x low general combiner parents. The correlation between cross means and their SCA values was significant and positive indicating that the crosses showing higher mean performance proved to be the highest specific combiners for mentioned characters. Therefore, the choice of promising cross combination would be based on mean performance of the crosses. The results of phenotypic (rp < /sub>) and genotypic (r9) correlation coefficients concluded that plant height, technical length, green weight, fiber percentage and fiber length are the major components contributing to fiber weight per plant in kenaf. Therefore, selection for these traits will improve the fiber yield in kenaf. Also, fruiting zone length as selection index to improve seed yield in kenaf. | ||
| Keywords | ||
| Combining ability; Gene action; Correlation; kenaf | ||
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