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Increasing plant vigour and tomato fruit yield under salinity by inducing plant adaptation at the earliest seedling stage

AutorParra, Margarita; Albacete, Alfonso ; Martínez-Andújar, Cristina ; Pérez-Alfocea, Francisco
Palabras claveAdaptation to salinity
Horizontal transmission
Ionic regulation
Lycopersicon esculentum
Plant vigour
Polyethylene glycol
Potassium selectivity
Fecha de publicaciónmay-2007
CitaciónEnvironmental and Experimental Botany 60(1): 77-85(2007)
ResumenIn order to reduce the negative effect of salinity on fruit yield, 5-day-old tomato seedlings (Lycopersicon esculentum) were haloconditioned by complete immersion in osmotic/saline solutions composed of PEG (−0.5, −0.75, −1 MPa), with or without 10 mM NaCl, for 1, 3, 5 and 8 days. Under moderate salinity (7.5 dS m−1), the pre-adapted plants produced 23% more shoot biomass and fruit yield than the non-adapted plants. In addition to the induced vigour, the improved tolerance in most pre-treatments was related to lower Na+ and Cl− concentrations in the leaves and increases in leaf K+ contents and K+/Na+ ratio, but the contrary was also observed. Overall, the most effective haloconditioning treatment seems to be the application of −0.75 MPa for 3 days. During the experiment in greenhouse, some vigorous haloconditioned plants were propagated through adventitious apex culture and evaluated under salinity in a short-term experiment. The results suggested that the induced salt tolerance was not horizontally transmitted, indicating that (i) the individuals chosen were not genetically more vigorous, but (ii) it is likely that they responded better to the induced adaptation, and (iii) this adaptation is probably mediated by epigenetic changes taking place in the roots.
DescripciónThe authors dedicate this paper to the memory of the late Professors Manuel Caro (CEBAS-CSIC) and Gilles Guerrier (Université d’Orléans, France).
Versión del editorhttp://dx.doi.org/10.1016/j.envexpbot.2006.06.005
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