Unravelling the genetic complexity of sorghum seedling development under low temperature conditions

Bekele, W.A. and Fiedler, K. and Shiringani, A. and et al, . (2013) Unravelling the genetic complexity of sorghum seedling development under low temperature conditions. Plant, Cell & Environment. pp. 1-52. (Unpublished)

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Sorghum is a promising alternative to maize for bioenergy production in Europe, however its use is currently limited by poor adaptation to low temperatures during and after germination. We collected multi-trait phenotype data under optimal and suboptimal temperatures in a genetically-diverse recombinant inbred line (RIL) mapping population showing contrasting segregation patterns for pre- and post-emergence chilling tolerance. Germination, emergence, seedling development, root architecture and seedling survival were assessed in two different seedlots. Emergence and root establishment were found to be the key determinants of development and survival under chilling stress. Highly-interactive epistatic QTL hotspots, including a previously unknown QTL on Sb06 with a significant effect on prolonged chilling survival, were found to regulate different physiological mechanisms contributing to maintenance of growth and development despite the chilling temperatures. The major QTL regions harbour promising candidate genes with known roles in abiotic stress tolerance. Identification of loci in the QTL hotspot regions conferring maintenance of cell division and growth under early chilling stress represents a promising step towards breeding for successful establishment of sorghum in temperate climates.

Item Type: Article
Additional Information: The authors thank Arndt Zaccharias (KWS Saat AG, Einbeck, Germany) for seed production 3 in Italy and Chile. Excellent technical assistance was provided by Swetlana Renner, Nelly 4 Weiss, Mario Tolksdorf, Malte Luh, Markus Kolmer, David Wiese and Helge Flüss. This 5 research was funded by the BMBF Bioenergy 2021 grant 0315421B.
Uncontrolled Keywords: abiotic stress; sweet sorghum; QTL; chilling; low temperature
Author Affiliation: Department of Plant Breeding, Justus Liebig University, Giessen, Germany
Subjects: Crop Improvement > Genetics/Genomics
Crop Improvement > Seed Technology
Divisions: Sorghum
Depositing User: Mr Balakrishna Garadasu
Date Deposited: 10 Sep 2013 09:42
Last Modified: 10 Sep 2013 09:42
Official URL: http://dx.doi.org/10.1111/pce.12189
URI: http://eprints.icrisat.ac.in/id/eprint/11268

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