Please use this identifier to cite or link to this item:
https://hdl.handle.net/2440/120181
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Type: | Journal article |
Title: | A major root architecture QTL responding to water limitation in durum wheat |
Author: | Alahmad, S. El Hassouni, K. Bassi, F.M. Dinglasan, E. Youssef, C. Quarry, G. Aksoy, A. Mazzucotelli, E. Juhász, A. Able, J.A. Christopher, J. Voss-Fels, K.P. Hickey, L.T. |
Citation: | Frontiers in Plant Science, 2019; 10:1-18 |
Publisher: | Frontiers |
Issue Date: | 2019 |
ISSN: | 1664-462X 1664-462X |
Statement of Responsibility: | Samir Alahmad, Khaoula El Hassouni, Filippo M. Bassi, Eric Dinglasan, Chvan Youssef, Georgia Quarry, Alpaslan Aksoy, Elisabetta Mazzucotelli, Angéla Juhász, Jason A. Able, Jack Christopher, Kai P. Voss-Fels and Lee T. Hickey |
Abstract: | The optimal root system architecture (RSA) of a crop is context dependent and critical for efficient resource capture in the soil. Narrow root growth angle promoting deeper root growth is often associated with improved access to water and nutrients in deep soils during terminal drought. RSA, therefore is a drought-adaptive trait that could minimize yield losses in regions with limited rainfall. Here, GWAS for seminal root angle (SRA) identified seven marker-trait associations clustered on chromosome 6A, representing a major quantitative trait locus (qSRA-6A) which also displayed high levels of pairwise LD (r 2 = 0.67). Subsequent haplotype analysis revealed significant differences between major groups. Candidate gene analysis revealed loci related to gravitropism, polar growth and hormonal signaling. No differences were observed for root biomass between lines carrying hap1 and hap2 for qSRA-6A, highlighting the opportunity to perform marker-assisted selection for the qSRA-6A locus and directly select for wide or narrow RSA, without influencing root biomass. Our study revealed that the genetic predisposition for deep rooting was best expressed under water-limitation, yet the root system displayed plasticity producing root growth in response to water availability in upper soil layers. We discuss the potential to deploy root architectural traits in cultivars to enhance yield stability in environments that experience limited rainfall. |
Keywords: | GWAS QTL drought adaptation haplotype root angle root architecture seminal roots |
Rights: | © 2019 Alahmad, El Hassouni, Bassi, Dinglasan, Youssef, Quarry, Aksoy, Mazzucotelli, Juhász, Able, Christopher, Voss-Fels and Hickey. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms. |
DOI: | 10.3389/fpls.2019.00436 |
Grant ID: | http://purl.org/au-research/grants/arc/DE170101296 |
Published version: | http://dx.doi.org/10.3389/fpls.2019.00436 |
Appears in Collections: | Agriculture, Food and Wine publications Aurora harvest 4 |
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File | Description | Size | Format | |
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hdl_120181.pdf | Published Version | 4.89 MB | Adobe PDF | View/Open |
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