The main objective of this study was to evaluate the possibilities of using morphological characters as selection criteria for yield improvement in barley (Hordeum vulgare L.). In order to obtain this information, the F1 of seven‐cultivar diallel cross was grown in the field in 1969 and 1970 to study the inheritance of grain yield, tillers per plant, kernel weight, kernels per head, flag leaf area, erectophile flag leaf area, peduncle area, head area, flag leaf area duration, culm diameter, and flag leaf angle,The results indicate that both agronomic and morpho‐physiological traits were controlled mainly by additive gene action. Dominance effects were also observed, but these were not stable in controlling grain yield, kernel weight, and flag leaf angle. The photosynthetic areas above the flag leaf node, culm diameter, and flag leaf area duration appear to be controlled by partially recessive gene action. With the exception of flag leaf angle, all the morpho‐physiological traits were significantly associated with grain yield over two years of observation. Since selection for morpho‐physiological traits is easy and the heritabilities for these traits were quite high, genetic gains for these traits are expected. Consequently, selection for morpho‐physiological traits appears to be a promising means of establishing a high yielding plant type.
Seven varieties of long bean, which included three local and four exotic, were crossed in a complete diallel. This was an attempt to study the inheritance of crude protein content, protein yield, flowering date, pod yield and yield components.Both additive and non-additive gene effects were responsible for the genetic variation in the diallel population. However, dominance variance was more important than additive variance in crude protein content, number of pods per plant and number of seeds per pod. For seed weight and pod length, additive variance was more important.The crude protein content, protein yield and number of pods per plant appeared to be controlled by overdominance effects. Partial dominance seemed to be the case for flowering date, pod length and seed weight; complete to overdominance for pod yield. High protein appeared to be associated with recessive genes whereas there was a general trend of high yielding parents carrying more dominant genes.
In a 7x7 diallel-cross experiment utilizing parents with varying resistance to mosaic virus disease and of different horticultural types significant heterosis over the better parent was found in number of days between sowing and flowering and over the mean of the two parents in other characters. The combining ability analysis revealed that genetic control of most character variation was due to additive effects.
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