Genetic architecture of yield and yield attributing traits of bitter gourd
Keywords: bitter gourd, genetic architecture, degree of dominance, heritability
AbstractA study was conducted during summer 2011 to study the genetic architecture of yield and yield attributing traits in bitter gourd by using diallel analysis. The results revealed the predominant role of non-additive gene action in the inheritance of yield and yield attributing characters except days to 1st male and female flower appearance. Further degree of dominance (H/D)1/2 was more than unity indicating the over dominance. The proportion of dominant and recessive genes (KD/Kr) in the parents was observed to be > 1 indicating the influence of recessive genes. Heritability (narrow sense) showed moderate values (> 0.50) for number of fruits/vine, average fruit weight, fruit girth, number of seeds/fruit, days to 1st male and female flower appearance suggesting selection methods for improvement of these characters. Low heritability estimate for yield and remaining characters like fruit length, plant height, number of laterals/vine, node number at 1st male and female flower appearance, sex ratio, pulp thickness and fruit length indicated that these characters were more prone to environmental fluctuations and need to be tested under diverse environments for effective selection.
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