Abstract
A comparison among two forms of half-diallel analysis was made. The different half-diallel techniques used were: Griffing\\\'s model I, method 2 and 4. These methods of diallel analysis were found to be interrelated. However, as the Griffing\\\'s model I, method 4 model partitioned heterosis into different components as well as gave information about combining ability and this method had certainly some advantages over the other. The results further indicated the using parental generations in the second Griffing method may cause biased estimate of the GCA and SCA variances. Thus, using the fourth Griffing method is more suitable than the other methods in providing time, cost and facilities, and is recommended as an applicable method.
Highlights
Estimates of combining ability are useful in determining the breeding value of cucumber lines by suggesting the appropriate use in a breeding program
The general combining ability (GCA) is a measure of the additive genic action, while the specific combining ability (SCA) is assumed to be a deviation from additivity
Reciprocal crosses are similar to direct crosses it becomes impractical to carry out an experiment using a complete diallel cross design
Summary
Estimates of combining ability are useful in determining the breeding value of cucumber lines by suggesting the appropriate use in a breeding program. Has an expected value which is the sum of the general combining abilities of its two parental lines. The cross may, deviate from this expected value to a greater or lesser extent This deviation is called the specific combining ability of the two lines in combination. Reciprocal crosses are similar to direct crosses it becomes impractical to carry out an experiment using a complete diallel cross design. In such situations, we use partial diallel cross designs where a subset of crosses are used. Gupta et al [14] and Mukerjee [12] provide orthogonal blocking schemes for partial diallel cross designs. A comparative view of Griffing’s model I, method 2 and 4 has been presented and discussed in light of their practical significance
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