Pandey, P. and Pandey, V.R. and Kumar, A. and et al, . (2015) Relationship between heterosis and genetic diversity in Indian pigeonpea [Cajanus cajan (L.)Millspaugh] accessions using multivariate cluster analysis and heterotic grouping. Australian Journal of Crop Science, 9 (6). pp. 494-503.
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Abstract
Pigeonpea (Cajanus cajan (L.) Millspaugh) is one of the most important food legume crops in the semi-arid regions of the world. India is the largest pigeonpea growing country however; its productivity per unit area by world standard is sparingly low and stagnant owing to several biotic and abiotic stresses. In order to increase its productivity, high yielding and disease resistant varieties/hybrids should be developed. Hence, an attempt was made to assess relationship between heterosis and genetic diversity as well as forming heterotic groups for pigeonpea breeding. Three CMS lines were crossed with 20 elite genotypes/restorers in a line x tester mating system and the resultant 60 F1 hybrids along with their parents were evaluated for various morphological traits to predict the genetic relationship among parents and heterosis in their crosses. The parental genotypes under study fell into five distinct non-overlapping clusters. Maximum intra-cluster distance was in cluster III (263.80) followed by cluster IV (253.62) and cluster I (244.81). The inter-cluster distances varied from 299.93 (between cluster I and II) to 727.79 (between cluster II and IV). Generally, the crosses derived from high diversity group showed high positive significant heterosis for seed yield. However, some crosses give very high negative heterosis for seed yield although their parents belong to a high diversity group. The reason for this possibly will be linkage of alleles for complex genetic traits as biomass and yield. Consequently, the precision of genetic distance can be obtained by estimating genetic distance through molecular techniques. Among the top fifteen heterotic hybrids for seed yield, ten crosses were resulted from crossing between parents of low diversity while, five from the high diversity group. Heterotic grouping evinced that usually, yield, heterosis and specific combining ability are higher in inter-group crosses than in intra-group crosses. It could be concluded that genetic diversity can be utilized as a reliable parameter for predicting heterosis in hybrids.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | Cajanus cajan (L.) Millspaugh, Genetic diversity, Heterosis, Heterotic groups. |
| Author Affiliation: | Indian Institute of Pulses Research, Kanpur-208024 (U.P.) India |
| Subjects: | Crop Improvement |
| Divisions: | Pigeonpea |
| Depositing User: | Mr B Krishnamurthy |
| Date Deposited: | 04 Sep 2015 10:31 |
| Last Modified: | 04 Sep 2015 10:31 |
| URI: | http://eprints.icrisat.ac.in/id/eprint/13830 |
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