ESTIMATION OF SOME GENETIC PARAMETERS AND GENE ACTION FOR YIELD, YIELD COMPONENTS AND FIBER PROPERTIES IN TWO INTER-VARIETAL COTTON CROSSES | ||||
| Journal of Plant Production | ||||
| Article 5, Volume 32, Issue 11, November 2007, Page 8953-8966 PDF (558.54 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/jpp.2007.221133 | ||||
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| Author | ||||
| M. A.A. Nagib | ||||
| Cotton Research Institute, Agricultural Research Centre, Giza, Egypt | ||||
| Abstract | ||||
| This investigation was carried out during the three growing seasons of 2004, 2005 and 2006 at Sids Agricultural Experiment Station (Beni-Swief), the two inter-varietal crosses [Dandara x {Giza 83 x (Giza 75 x 5844}] and [Giza 90 x {Giza 83 x (Giza 75 x 5844)}] with its six populations P1, P2, F1, F2, BC1 and BC2 were grown in a randomized complete block design with four replications. The obtained results showed significant positive heterosis relative to mid-parents, in both the two crosses for all studied characters except PI in cross I and L % and 2.5% SL in cross II. Positive significant better parent heterosis were found for PFN, BW, SCY/P, LY/P, LI, Mic and 2.5% SL while showed negative significant PI in cross I. In cross II, the values of better parent heterosis were positive and significant for BW (g) and PI and negative for L%. The inbreeding depression values were significant and positive for BW, SCY/P and LI in both crosses and PFN and 2.5% SL in cross I as well as LY/P, Mic and PI in cross II, while negative value was recorded for PI in cross I. Potence ratio values showed partial-dominance or over-dominance for all studied characters in both crosses. Significant additive gene effects were found for PFN, L %, St, LI and PI in both crosses, also 2.5% SL in cross I and B/P, SCY/P and LY/P in cross II. Significant dominance gene effects were detected for B/P, SCY/P, LY/P, SI and Mic in both crosses, as well as PFN and LI in the first cross, BW (g) and PI in the second cross. The values of epistatic gene effect additive x additive (i), were significant for B/P, SCY/P, LY/P, L% and PI in both crosses. Significant additive x dominance (j) values of epistasis were observed for most studied characters in the two crosses. Relative high values of heritability in broad sense (over 50%) were noticed for all studied characters in both crosses except for B/P, SCY/P, LY/P, and L%, in cross I and for B/P, BW and LUR %, in cross II. High heritability values in narrow sense (over 50%) were recorded for PI in cross II, while moderate hertability values (ranged from 30 to 50%), in narrow sense, were recorded for PFN, BW, 2.5% SL and LUR % in the first cross and for PFN, L %, SI, Mic, PI and 2.5% SL, in the second cross. The other character showed low heritability values in narrow sense. Maximum predicted genetic character showed low heritability values in narrow sense. Maximum predicted genetic advance from selecting the desired 5% of F2 population were achieved for PFN and BW in cross I and for PFN and SCY/P in cross II. The exerted values of genotypic coefficients between most characters were higher than the corresponding values of phenotypic correlation coefficients in both crosses. Both phenotypic and genotypic correlations were highly significant between (B/P and each of BW, SCY/P, LY/P), (SCY/P and LY/P) and between (SI and LI) in both crosses. The coefficients of genotypic correlation were significant between (BW and each of SCY/P, LY/P, L%, SI and 2.5% SL), as well as between (SCY/P and each of L %, SI, LI and LUR) in the first cross. While, in the second cross, highly significant positive genotypic correlations were detected between (BW and each of L%, SI, LI and LUR), (SCY/P and each of SI, LI and Mic). | ||||
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