Salt stress differently affects growth, water status and antioxidant enzyme activities in Solanum lycopersicum and its wild relative Solanum chilense
Juan Pablo Martínez A E H , Alejandro Antúnez B , Héctor Araya C , Ricardo Pertuzé D , Lida Fuentes E , X. Carolina Lizana F and Stanley Lutts G
+ Author Affiliations
- Author Affiliations
A Instituto de Investigaciones Agropecuarias (INIA-La Cruz), Chorrillos 86, La Cruz, Casilla 3, Región de Valparaíso, Chile.
B Instituto de Investigaciones Agropecuarias (INIA-La Platina), Santa Rosa 11610, La Pintana, Casilla 3, Santiago, Chile.
C Facultad de Medicina, Universidad de Chile, Santiago, Avenida Independencia 1027, Santiago, Chile.
D Facultad de Ciencias Agrarias, Universidad de Chile, Avenida Santa Rosa 11315, Santiago, Chile.
E Centro Regional de Estudios en Alimentos Saludables (CREAS), Conicyt Regional, Gore Región de Valparaíso, R12C1001, Avenida Universidad 330, sector Curauma, Valparaíso, Chile.
F Instituto de Producción y Sanidad Vegetal, Facultad de Ciencias Agrarias. Universidad Austral de Chile, Campus Isla Teja, Valdivia, Chile.
G Groupe de Recherche en Physiologie Végétale, Université catholique de Louvain (UCL), Croix du Sud 5, Boîte 13, B-138 Louvain-la-Neuve, Belgium.
H Corresponding author. Email: jpmartinez@inia.cl
Australian Journal of Botany 62(5) 359-368 https://doi.org/10.1071/BT14102
Submitted: 27 November 2013 Accepted: 21 June 2014 Published: 9 September 2014
Abstract
The effect of saline stress (NaCl, 40, 80 and 160 mmol L−1 of NaCl) on growth, plant water status and leaf antioxidant enzyme activities was investigated in a commercial cultivar of cherry tomato (Solanum lycopersicum var. cerasiforme L.) and in a wild-related species collected in a salt-affected area of North Chile (Solanum chilense Dun.). Salt stress was applied in a nutrient solution at the vegetative stage during 40 days. The highest NaCl concentration reduced shoot relative growth, fresh and dry weight and leaf area in the cultivated S. lycopersicum but had less impact on S. chilense. Both species were able to efficiently perform osmotic adjustment but S. chilense also exhibited an increase in leaf succulence. The oxidative stress estimated through malondialdehyde quantification was always higher in the cultivated S. lycopersicum, both in the absence and in the presence of salt. Total superoxide dismutase activity (EC 1.15.1.1) increased in response to the highest dose of NaCl in S. chilense but remained constant in S. lycopersicum. Salinity induced an increase in ascorbate peroxidase (EC 1.11.1.11) in S. chilense but reduced it in S. lycopersicum. It is concluded that S. chilense displays efficient strategies to cope with high NaCl doses and that management of the oxidative status is a key mechanism allowing this species to tolerate salinity.
Additional keywords: halophyte, salinity, tomato.
References
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