Appraisal of Salt Tolerance under Greenhouse Conditions of a Cucurbitaceae Genetic Repository of Potential Rootstocks and Scions

Soil salinization due to climate change and intensive use of water and soil is increasing exponentially.Cucurbitaceaespecies are cultivated worldwide and the identification of salinity tolerant genotypes to be used as rootstock or scion for securing yield stability in salt affected agricultural areas is a research priority. In the present greenhouse study, we assessed the response to salinity (0 mM a non-salt control and 150 mM NaCl dissolved in the nutrient solution) in the seedlings of 30 genotypes of cucurbits grown in a floating hydroponic system. The species tested included 16 genotypes ofCucumis meloL. (CM1-16), 6Citrullus vulgarisSchrad. (CV1-6), 2 interspecific hybrids ofCucurbita maximaDuch. xCucurbita moschataDuch. (CMM-R1 and 2), 4 bottle gourd (Lagenaria siceraria(Molina) Standl. (LS1-4)), 1Cucurbita moschataDuch. (CMO51-17), and 1 luffa(Luffa cylindricaMill. (LC1)) species. Results highlighted different morphological and physiological traits between the species and genotypes and a different response to salt stress. We identifiedC. maxima x C.moscatainterspecific hybrid CMM-R2, melon genotypes CM6, CM7, CM10, and CM16 together with watermelon genotypes CV2 and CV6 and bottle gourd LS4 as salt tolerant genotypes and possible candidates as salt resistant rootstock to be introduced in grafting programs.