Windpassinger, S. and Friedt, W. and Deppe, I. and et al, . (2017) Towards Enhancement of Early-Stage Chilling Tolerance and Root Development in Sorghum F1 Hybrids. Journal of Agronomy and Crop Science, 203 (2). pp. 146-160.
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Abstract
Sorghum (Sorghum bicolor L. Moench) is regarded a drought-tolerant alternative to maize as a bioenergy and fodder crop, but its early-stage chilling sensitivity is obstructing a successful implementation in temperate areas. While several studies have identified quantitative trait loci (QTL) underlying chilling tolerance-related traits in sorghum lines, little is known about the inheritance of these traits in F1 hybrids. We have conducted a comprehensive approach to analyse heterosis, combining ability and the relation between line per se and hybrid performance for emergence and early shoot and root development comprising both field trials and controlled environment experiments including chilling tests. To our best knowledge, this is the first study analysing heterosis for sorghum root parameters under chilling. Our results show that most traits are heterotic and that the midparent values are rather poor predictors of hybrid performance. Hybrid breeding programmes should focus on efficient GCA tests and the establishment of genetically diverse pools to maximise heterosis rather than on a too strict selection among lines based on their per se performance. The medium-to-high heritabilities estimated for seedling emergence and juvenile biomass suggest that a robust breeding progress for these complex traits is feasible.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | Chilling tolerance, Combining ability, Heterosis, Hybrid performance, Root development, Sorghum breeding |
| Author Affiliation: | Department of Plant Breeding, Research Center for BioSystems, Land Use and Nutrition (IFZ), Giessen, Germany |
| Subjects: | Plant Production |
| Divisions: | Sorghum |
| Depositing User: | Mr B Krishnamurthy |
| Date Deposited: | 16 Nov 2017 03:37 |
| Last Modified: | 16 Nov 2017 03:37 |
| Official URL: | http://dx.doi.org/10.1111/jac.12171 |
| URI: | http://eprints.icrisat.ac.in/id/eprint/15172 |
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