Vol. 69 No: 4

Title:
Comparative Salt Responses at Cell and Whole-Plant Levels of Cultivated and Wild Tomato Species and Their Hybrid

Authors:
F. PEREZ-ALFOCEA, G. GUERRIER, M.T. ESTAÑ and MARIA C. BOLARIN

pp: 639-644

Abstract:
Response to increased salinity was compared in whole plants and calli from leaf, stem and root of Lycopersicon esculentum Mill. cv. P-73, Lycopersicon pennellii (Correll) D'Arcy ac PE-47 and their interspecific hybrid. Three NaCl treatments were applied (0, 70 and 140 mM) for 28 d. In both calli and whole plants, L. pennellii was more salt-tolerant than the cultivated species and the hybrid according to the growth responses, although different degrees of salt tolerance were generally found between plants and calli. The Na⁺ and Cl^- accumulations with salinity were higher in L. pennellii than in L. esculentum at both levels of organization. The interspecific hybrid showed an accumulation ability for Na⁺ and Cl^- intermediate to its parents in the shoot of the whole plants and similar to L. pennellii in the callus tissues. Either no decrease or a small decrease of K⁺ concentrations with salinity were found in both whole plants and callus tissues of L. esculentum. However, K⁺ concentrations decreased in the organs and calli of L. pennellii and the hybrid with increasing salinity. Only at the whole plant level did L. pennellii have a Na⁺/K⁺ ratio higher than L. esculentum, showing the hybrid to have values between those of its parents in the shoot.

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