Adaptation to Water and Salt Stresses of Solanum pimpinellifolium and Solanum lycopersicum var. cerasiforme

[EN] Solanum pimpinellifoliumandSolanum lycopersicumvar.cerasiformerepresent a valuable tool for tomato breeding, particularly for tolerance to abiotic stresses. Water stress and salinity are major constraints to tomato's cultivation, and for which limited genetic variability has been reported within the cultivated species. We evaluated four accessions ofS. pimpinellifoliumand four ofS. l.var.cerasiformefor their adaptation to water deficit and salinity. The CO(2)assimilation rate, stomatal conductance, substomatal CO(2)concentration, transpiration rate, and leaf chlorophyll concentration were evaluated, as well as morphological and agronomic traits. The accessions showed a remarkable inter- and intra-species response variability to both stresses. TwoS. pimpinellifoliumaccessions and oneS. l.var.cerasiformeshowed unaltered physiological parameters, thus indicating a good adaptation to water deficit. TwoS. l.var.cerasiformeaccessions showed an interesting performance under salt stress, one of which showing also good adaptation to water stress. In general, both stresses showed a negative impact on leaf size and fruit fresh weight, especially in the big-sized fruits. However, flowering, fruit setting and earliness remained unaltered or even improved when compared to control conditions. Stressed plants yielded fruits with higher degrees Brix. Response to stresses seemed to be linked to origin environmental conditions, notwithstanding, variability was observed among accessions of the same region.This research was funded by the Spanish Ministerio de Economia y Competitividad and the Fondo Europeo de Desarrollo Regional/European Regional Development Fund, grant number AGL2015-71011-R. Authors also thank the G2P-SOL (Linking genetic resources, genomes, and phenotypes of Solanaceous crops) and BRESOV (Breeding for resilient, e fficient, and sustainable organic vegetable production) projects for support. G2P-SOL and BRESOV projects have received funding from the European Union's Horizon 2020 research and innovation program under grant agreements 677379 (G2PSOL), and 774244 (BRESOV). David Alonso is grateful to Universitat Politecnica de Valencia for a predoctoral (PAID-01-16) contract under the Programa de Ayudas de Investigacion y Desarrollo.Martínez-Cuenca, M.; Pereira-Días, L.; Soler Aleixandre, S.; López-Serrano, L.; Alonso-Martín, D.; Calatayud, Á.; Díez, MJ. (2020). Adaptation to Water and Salt Stresses of Solanum pimpinellifolium and Solanum lycopersicum var. cerasiforme. Agronomy. 10(8):1-19. https://doi.org/10.3390/agronomy10081169119108Cramer, G. R., Urano, K., Delrot, S., Pezzotti, M., & Shinozaki, K. (2011). 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