COMBINING ABILITY AND THE ORDER EFFECT IN DOUBLE CROSS HYBRIDS OF COTTON 1- EARLINESS TRAITS | ||||
| Egyptian Journal of Agricultural Research | ||||
| Article 12, Volume 90, Issue 1, March 2012, Page 173-190 PDF (490.32 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/ejar.2012.159587 | ||||
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| Authors | ||||
| TALAT A. EL-FEKI1; AHMED I. EL- AGAMY2; HAMZA E. YASSIEN2; HASSAN A. EL- HOSEINY1 | ||||
| 1Cotton Research Institute, Agricultural Research Center, Giza, Egypt. | ||||
| 2Faculty of Agriculture, Al-Azhar University, Cairo, Egypt. | ||||
| Abstract | ||||
| The objectives of this study were to determine the components of genetic variance and its order on the effect of the hybrids of double cross. Six diverse strains belonging to (Gossypium barbadense, L.). were used to produce 45 possible double cross hybrids. These hybrids were raised cross in a randomized complete block design with three replications. The additive gene variances were negative for earliness traits while the values of epistasis of additive (A) x additive (A) types were considerable for earliness traits. The epistasis additive x additive x additive was significant for earliness traits except for position of first fruiting node where the epistasis additive x dominance was considerable. The parent Karshenky (p3) was the best parent when used as one forming the double crosses hybrids for earliness traits. The parent {Australian (P1), BBB (P2)}, {Karshenky (P3) and Suvin (P5)} and {BBB (P2) and Giza 70 (P4)} had highest negative of 2-lines general effect. in all possible combinations without respect to arrangement (ijk) the best triple was (P3P5P6) followed P1P2P4, P1P2P5 and P1P2P3 and P2P4P5. From previously results it could be suggested that P1, P5, P6, as well as P3 formed the best “quadrialle” or with the parent Giza 70 (P4) in earliness index. The general effect of set of any four parents parent in various combination irrespective of order, it was obvious that parents (P1, P2, P5 and P6), (p1, P2, P4 and P5), (P1, P3, P5 and P6), (p1, P4, P5 and P6) exhibited the best effected to forming the double crosses for position of first node, for days to first flower, days to first boll and earliness index. The results confirm that the order in which the parents go into double cross hybrids is a deciding factor for its high or low performance. | ||||
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