Comparison of drought and heat resistance strategies between Solanum lycopersicum and its wild relative Solanum chilense
(2022) Solanaceae 2022 — Location: Thessaloniki, Grèce (1.November.2022)
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- Drought and high temperature significantly limit plant growth and productivity in tomato (Solanum lycopersicum). The elucidation of tolerance strategies in wild relatives is a powerful approach to understand local adaptations for potential crop improvement. Solanum chilense is able to cope with harsh environment in its area of origin and could represent an abundance of genetic diversity for tomato improvement. However, physiological basis of drought and heat tolerance in Solanum chilense has received only minor attention until now. In this study, we compared the effects of drought, high temperature, and their combination in two cultivars of S. lycopersicum and six populations of S. chilense. Plants were grown at 21/19°C or 28/26°C under well-watered and water-stressed conditions. Plant growth, physiological responses, and expression of stress-responsive genes were investigated. The effects of water stress, high temperature, and their combination differed according to the accession, suggesting differences in stress resistance between species and populations. Water stress affected plants more negatively than temperature from a morpho-physiological point of view, while the expression of stress-responsive genes was more affected by temperature. Accessions clustered in two groups regarding resistance to water stress and high temperature. The expression of stress-responsive genes was more stable in resistant accessions than in sensitive ones in response to water stress and high temperature. Altogether, our results suggest that water stress and high temperature resistance in S. chilense did not depend on single traits but on a combination of morphological, physiological, and genetic traits.
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Blanchard-Gros, R., Bigot, S., Martinez, J.-P., & Quinet, M. (2022). Comparison of drought and heat resistance strategies between Solanum lycopersicum and its wild relative Solanum chilense. Solanaceae 2022, Thessaloniki, Grèce. https://hdl.handle.net/2078.5/268669