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Insights into the heat-responsive transcriptional network of tomato contrasting genotypes

Published online by Cambridge University Press:  10 March 2021

Sirine Werghi ,
Charfeddine Gharsallah ,
Nishi Kant Bhardwaj ,
Hatem Fakhfakh  and
Faten Gorsane Open the ORCID record for Faten Gorsane [Opens in a new window]
Sirine Werghi
Affiliation:
Laboratory of Molecular Genetics, Immunology and Biotechnology, Faculty of Sciences of Tunis, University of Tunis El Manar, Tunis2092, Tunisia
Charfeddine Gharsallah
Affiliation:
Laboratory of Molecular Genetics, Immunology and Biotechnology, Faculty of Sciences of Tunis, University of Tunis El Manar, Tunis2092, Tunisia
Nishi Kant Bhardwaj
Affiliation:
Avantha Centre for Industrial Research & Development, Paper Mill Campus, Yamuna Nagar135001, India
Hatem Fakhfakh
Affiliation:
Laboratory of Molecular Genetics, Immunology and Biotechnology, Faculty of Sciences of Tunis, University of Tunis El Manar, Tunis2092, Tunisia Faculty of Sciences of Bizerte, University of Carthage, Zarzouna7021, Tunisia
Faten Gorsane*
Affiliation:
Laboratory of Molecular Genetics, Immunology and Biotechnology, Faculty of Sciences of Tunis, University of Tunis El Manar, Tunis2092, Tunisia Faculty of Sciences of Bizerte, University of Carthage, Zarzouna7021, Tunisia
*
*Corresponding author. E-mail: fatengorsane@gmail.com, faten.gorsne@fsb.u-carthage.tn
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Abstract

During recent decades, global warming has intensified, altering crop growth, development and survival. To overcome changes in their environment, plants undergo transcriptional reprogramming to activate stress response strategies/pathways. To evaluate the genetic bases of the response to heat stress, Conserved DNA-derived Polymorphism (CDDP) markers were applied across tomato genome of eight cultivars. Despite scattered genotypes, cluster analysis allowed two neighbouring panels to be discriminate. Tomato CDDP-genotypic and visual phenotypic assortment permitted the selection of two contrasting heat-tolerant and heat-sensitive cultivars. Further analysis explored differential expression in transcript levels of genes, encoding heat shock transcription factors (HSFs, HsfA1, HsfA2, HsfB1), members of the heat shock protein (HSP) family (HSP101, HSP17, HSP90) and ascorbate peroxidase (APX) enzymes (APX1, APX2). Based on discriminating CDDP-markers, a protein functional network was built allowing prediction of candidate genes and their regulating miRNA. Expression patterns analysis revealed that miR156d and miR397 were heat-responsive showing a typical inverse relation with the abundance of their target gene transcripts. Heat stress is inducing a set of candidate genes, whose expression seems to be modulated through a complex regulatory network. Integrating genetic resource data is required for identifying valuable tomato genotypes that can be considered in marker-assisted breeding programmes to improve tomato heat tolerance.

Keywords

CDDP markersheat stressmiRNAsTFsSolanum lycopersicum
Type
Research Article
Information
Plant Genetic Resources , Volume 19 , Issue 1 , February 2021 , pp. 44 - 57
Copyright
Copyright © The Author(s), 2021. Published by Cambridge University Press on behalf of NIAB

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