NATURE OF GENE ACTION AND HETEROTIC PERFORMANCE FOR YIELD AND YIELD COMPONENTS IN SUMMER SQUASH (Cucurbita pepo l.)
Hussien, A. (2015). NATURE OF GENE ACTION AND HETEROTIC PERFORMANCE FOR YIELD AND YIELD COMPONENTS IN SUMMER SQUASH (Cucurbita pepo l.). EKB Journal Management System, 6(1), 29-40. doi: 10.21608/jpp.2015.49274
A. H. Hussien. "NATURE OF GENE ACTION AND HETEROTIC PERFORMANCE FOR YIELD AND YIELD COMPONENTS IN SUMMER SQUASH (Cucurbita pepo l.)". EKB Journal Management System, 6, 1, 2015, 29-40. doi: 10.21608/jpp.2015.49274
Hussien, A. (2015). 'NATURE OF GENE ACTION AND HETEROTIC PERFORMANCE FOR YIELD AND YIELD COMPONENTS IN SUMMER SQUASH (Cucurbita pepo l.)', EKB Journal Management System, 6(1), pp. 29-40. doi: 10.21608/jpp.2015.49274
Hussien, A. NATURE OF GENE ACTION AND HETEROTIC PERFORMANCE FOR YIELD AND YIELD COMPONENTS IN SUMMER SQUASH (Cucurbita pepo l.). EKB Journal Management System, 2015; 6(1): 29-40. doi: 10.21608/jpp.2015.49274

NATURE OF GENE ACTION AND HETEROTIC PERFORMANCE FOR YIELD AND YIELD COMPONENTS IN SUMMER SQUASH (Cucurbita pepo l.)

Journal of Plant Production
Article 3, Volume 6, Issue 1, January 2015, Page 29-40  XML PDF (465.9 K)
Document Type: Original Article
DOI: 10.21608/jpp.2015.49274
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Author
A. H. Hussien*
Vegetables Breeding Dept. Hort. Res. Inst.- Agricultural Research Center (ARC)- Giza- Egypt
Abstract
Six inbred lines of summer squash representing wide range of variability in most of the studied traits were utilized in a half diallel cross. The studied traits were  Plant height, days to female flowers, number of fruits/plant, average fruit length, average fruit diameter, average fruit weight, early yield/plant and total yield/plant. Heterotic performance, graphically variance/covariance analysis and genetic components were used to analyze the obtained data. Results showed that the maximum significant true heterosis (BP) in desirable direction (179.9%) was recorded for early yield/plant followed by total yield (106.9%), fruits number/plant(57.0%), plant height (40.9%), average fruit weight (32.5%) and days to female flowering date (-17.2%). Data of diallel table for each trait were subjected to graphical analysis to obtain information on the adequacy of the additive-dominance model of gene action. The relative position of array points on Vr/Wr graph indicated that parental genotype P1 (line-280) contained high frequency of dominant alleles for earliness, fruit length, fruit diameter, fruits number and both early and total yield. Results of diallel analysis indicated that the value (H/D)1/2  was more than unity for all studied traits indicating the presence of over-dominance and supporting the graphical conclusions. However, the predominance of non-additive gene effects and values of hn.s for most important traits suggesting the possibility exploiting dominance gene effects for improving such traits through heterosis breeding.
Keywords
summer squash; Heterosis; Genetic Components; heritability; Variance; Covariance
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