There are well established Heterotic Pools in maize, whereas such type of pools are not available in pigeonpea. To develop heterotic pools in pigeonpea, an often cross pollinated crop, which strategy one should follow so that maximum heterosis can be exploited?
Diversify and enhance genetic base of the parental lines
Produce more no of hybrids based on GCA and SCA
IN general DT X NDT gives heterotic HYBRIDS buy synchrony by staggering should be kept I mind
The first maize heterotic pattern was the combination of northern flints with southern dents. In India with pigeon pea the breeders should look for varieties with come from diverse soil types and environments. The races of pigeon pea would be analyzed as done for maize and the heterosis between different races would be source of the hybrid development. At the same time the heterotic pools are kept separately crossed and selfed and then superior hybrid combinations determined by making test hybrids. Hybrid development in maize is favored by the ability to get hundreds of seeds from each pollination this is not the case with pigeon pea where a pollination gives 3 to 5 seed for each manipulation and the take of the populations are not 100% either. Systems of sterility would aid the development of hybrid genetics in pigeon pea.
Concept of heterotic pool works in the conditions where different set of alleles are there in natural populations of diverse origin, as in case of maize. Concept of pools has failed miserably in many crops. In many systematically conducted studies, total diversity could not be related to heterosis. Therefore, we should follow the approach cautiously .
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