Abstract
Compared to maize and temperate grasses, sorghum has received less attention in terms of improving cell wall components. The objectives of this study were to identify quantitative trait loci (QTL) with main effects, epistatic and pleiotropic effects along with QTL × environment (QE) interactions controlling fibre-related traits in sorghum. Neutral detergent fibre (NDF), acid detergent fibre (ADF), acid detergent lignin (ADL), cellulose, hemicellulose, fresh leaf mass, stripped stalk mass, dry stalk mass, fresh biomass and dry biomass were analysed from a population of 188 grain × sweet sorghum recombinant inbred lines. A genetic map consisting of 157 DNA markers was constructed, and QTL were detected using composite interval mapping (CIM). CIM detected more than 5 additive QTL per trait explaining 7.1–24.7% of the phenotypic variation. Abundant co-localization of these QTL was observed across all chromosomes, and the highest cluster was identified on chromosome 6. Searching for candidate genes using the confidence interval of our QTL clusters reveals that these clusters might comprise a set of genes that are tightly linked. Some QTL showed multiple effects; however, the allele for each trait was favouring the parent with the increasing effect. QE interactions were observed for QTL showing multiple effects. Additive × additive interaction was observed for 7 out of 10 traits, indicating the importance of epistatic analysis. However, the phenotypic variation explained by digenic interactions was lower compared to the individual QTL. Our results indicate that various genetic components contribute to fibre-related traits and should be considered during the enhancement of sorghum for lignocellulosic biomass.
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Acknowledgments
The authors wish to thank Dr Willy Wenzel, ARC Potchefstroom, South Africa, for his invaluable advice regarding plant material and field experiments. We would like to gratefully acknowledge Dr Rod Snowdon for critically reading the manuscript, Benjamin Wittkop for his valuable input during fibre content analysis and Wubishet Bekele for his contribution in searching for candidate genes. We are also thankful for skilled technical assistance of Nelly Weiss, Swetlana Renner and Adriana Ochoa Fandiño in fibre content analysis. This work has been primarily supported by the German Academic Exchange Service (DAAD), the Agricultural Research Council (ARC) and the National Research Foundation (NRF) of South Africa.
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Shiringani, A.L., Friedt, W. QTL for fibre-related traits in grain × sweet sorghum as a tool for the enhancement of sorghum as a biomass crop. Theor Appl Genet 123, 999–1011 (2011). https://doi.org/10.1007/s00122-011-1642-4
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DOI: https://doi.org/10.1007/s00122-011-1642-4