HETEROSIS AND GENE ACTION FOR PARTIAL DIALLEL CROSSES IN COTTON I. COTTON INSECT RESISTANCE AND MULTIVARIATE ANALYSIS FOR TRAITS RELATED TO INSECT RESISTANCE | ||
| Egyptian Journal of Agricultural Research | ||
| Article 20, Volume 87, Issue 4, December 2009, Pages 1119-1134 PDF (247.39 K) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/ejar.2009.198835 | ||
| Authors | ||
| TALAT A. EL- FEKI1; RAMADAN K. HARB2; AZIZA M. M. SULTAN1 | ||
| 1Cotton Research Institute, Agricultural Research center, Giza, Egypt | ||
| 2Department of Botany, Faculty of Agriculture, Cairo University, Giza, Egypt | ||
| Abstract | ||
| This investigation was carried out at Giza Experimental Station, Agricultural Research Center, Egypt in 2002, 2003 and 2004 growing seasons using partial diallel crosses system among eight parents to estimate heterosis, potence ratio, inbreeding depression, combining ability, gene action and heritability for infestation percentage. Multivariate analysis was used to determine the intercorrelation between morphological traits and anatomical characters, with infestation percentage of bollworm to assess the importance of these traits. The results indicated that the damage was more in F1s than parents, Positive and significant inbreeding depression in F2 except for (G.90 x Okra leaf). G.C.A and S.C.A variances were highly significant in both generations with more importance for non additive gene action. The parents Nectariless, Okra leaf and G.90 were good combiners for decreasing infestation percentage. The broad sense heritability values were high in both generations, while narrow sense heritability values was moderate in F1. Significant negative correlations were observed between infestation percent and mean petiole diameter, number of xylem rows of petioles, placenta thickness and central leaf lobe index , while significant positive correlations were found in cortex thickness / stem , bract index and plant height. The factor analysis revealed that the traits of central lobe index , placenta thickness, lobing index, number. of xylem of petiole and mean petiole diameter have inter-relationship with infestation percent of insect. | ||
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