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Héreil A, Guillaume M, Duboscq R, Carretero Y, Pelpoir E, Bitton F, Giraud C, Karlova R, Testerink C, Stevens R, Causse M. Characterisation of a major QTL for sodium accumulation in tomato grown in high salinity. PLANT, CELL & ENVIRONMENT 2024. [PMID: 39148196 DOI: 10.1111/pce.15082] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/08/2024] [Revised: 07/09/2024] [Accepted: 07/30/2024] [Indexed: 08/17/2024]
Abstract
Soil salinity is a serious concern for tomato culture, affecting both yield and quality parameters. Although some genes involved in tomato salt tolerance have been identified, their genetic diversity has been rarely studied. In the present study, we assessed salt tolerance-related traits at juvenile and adult stages in a large core collection and identified salt tolerance quantitative trait loci (QTLs) by genome-wide association study (GWAS). The results suggested that a major QTL is involved in leaf sodium accumulation at both physiological stages. We were able to identify the underlying candidate gene, coding for a well-known sodium transporter, called SlHKT1.2. We showed that an eQTL for the expression of this gene in roots colocalized with the above ground sodium content QTL. A polymorphism putatively responsible for its variation was identified in the gene promoter. Finally, to extend the applicability of these results, we carried out the same analysis on a test-cross panel composed of the core collection crossed with a distant line. The results indicated that the identified QTL retained its functional impact even in a hybrid genetic context: this paves the way for its use in breeding programs aimed at improving salinity tolerance in tomato cultivars.
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Affiliation(s)
- A Héreil
- UR1052 GAFL, INRAE, Montfavet, France
| | - M Guillaume
- GAUTIER Semences, Route d'Avignon, Eyragues, France
| | - R Duboscq
- UR1052 GAFL, INRAE, Montfavet, France
| | | | - E Pelpoir
- UR1052 GAFL, INRAE, Montfavet, France
| | - F Bitton
- UR1052 GAFL, INRAE, Montfavet, France
| | - C Giraud
- UE A2M, INRAE, Montfavet, France
| | - R Karlova
- Laboratory of Plant Physiology, Plant Sciences Group, Wageningen University & Research, Wageningen, The Netherlands
| | - C Testerink
- Laboratory of Plant Physiology, Plant Sciences Group, Wageningen University & Research, Wageningen, The Netherlands
| | - R Stevens
- UR1052 GAFL, INRAE, Montfavet, France
| | - M Causse
- UR1052 GAFL, INRAE, Montfavet, France
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Grigore MN, Vicente O. Wild Halophytes: Tools for Understanding Salt Tolerance Mechanisms of Plants and for Adapting Agriculture to Climate Change. PLANTS (BASEL, SWITZERLAND) 2023; 12:plants12020221. [PMID: 36678935 PMCID: PMC9863273 DOI: 10.3390/plants12020221] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/16/2022] [Accepted: 12/20/2022] [Indexed: 05/27/2023]
Abstract
Halophytes, wild plants adapted to highly saline natural environments, represent extremely useful-and, at present, underutilised-experimental systems with which to investigate the mechanisms of salt tolerance in plants at the anatomical, physiological, biochemical and molecular levels. They can also provide biotechnological tools for the genetic improvement of salt tolerance in our conventional crops, such as salt tolerance genes or salt-induced promoters. Furthermore, halophytes may constitute the basis of sustainable 'saline agriculture' through commercial cultivation after some breeding to improve agronomic traits. All these issues are relevant in the present context of climate emergency, as soil salinity is-together with drought-the most critical environmental factor in reducing crop yield worldwide. In fact, climate change represents the most serious challenge for agricultural production and food security in the near future. Several of the topics mentioned above-mainly referring to basic studies on salt tolerance mechanisms-are addressed in the articles published within this Special Issue.
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Affiliation(s)
- Marius-Nicușor Grigore
- Faculty of Medicine and Biological Sciences, “Ștefan cel Mare” University of Suceava, Str. Universității 13, 720229 Suceava, Romania
| | - Oscar Vicente
- Institute for the Conservation and Improvement of Valencian Agrodiversity (COMAV, UPV), Universitat Politècnica de València, Camino de Vera s/n, 46022 Valencia, Spain
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