Effects of Salt and Water Stress on Plant Growth and on Accumulation of Osmolytes and Antioxidant Compounds in Cherry Tomato

  • Mohamad AL HASSAN Universitat Politècnica de València, Instituto de Biología Molecular y Celular de Plantas (UPV-CSIC), CPI, edificio 8E, Camino de Vera s/n, 46022 Valencia
  • Marina MARTÍNEZ FUERTES Universitat Politècnica de València, Instituto de Biología Molecular y Celular de Plantas (UPV-CSIC), CPI, edificio 8E, Camino de Vera s/n, 46022 Valencia
  • Francisco José RAMOS SÁNCHEZ Universitat Politècnica de València, Instituto de Biología Molecular y Celular de Plantas (UPV-CSIC), CPI, edificio 8E, Camino de Vera s/n, 46022 Valencia
  • Oscar VICENTE Universitat Politècnica de València, Instituto de Biología Molecular y Celular de Plantas (UPV-CSIC), CPI, edificio 8E, Camino de Vera s/n, 46022 Valencia
  • Monica BOSCAIU Universitat Politècnica de València, Instituto Agroforestal Mediterráneo (UPV), CPI, edificio 8E, Camino de Vera s/n, 46022 Valencia

Abstract

The effects of salt and water stress on growth and several stress markers were investigated in cherry tomato plants. Some growth parameters (stem length and number of leaves) and chlorophyll contents were determined every third day during plant growth, and leaf material was collected after 25 and 33 days of treatment. Both stresses inhibited plant growth; chlorophyll levels, however, decreased only in response to high NaCl concentrations. Proline contents largely increased in leaves of stressed plants, reaching levels high enough to play a major role in cellular osmotic adjustment. Despite reports indicating that tomato does not synthesize glycine betaine, the stress-induced accumulation of this osmolyte was detected in cherry tomato, albeit at lower concentration than that of proline. Therefore, it appears that the plants are able to synthesise glycine betaine as a secondary osmolyte under strong stress conditions. Total sugars levels, on the contrary, decreased in stress-treated plants. Both stress treatments caused secondary oxidative stress in the plants, as indicated by a significant increase in malondialdehyde (MDA) contents. Water stress led to an increase in total phenolics and flavonoid contents and a reduction of carotenoid levels in the leaves; flavonoids also increased under high salinity conditions.

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Author Biographies

Oscar VICENTE, Universitat Politècnica de València, Instituto de Biología Molecular y Celular de Plantas (UPV-CSIC), CPI, edificio 8E, Camino de Vera s/n, 46022 Valencia
Department of Biotechnology, Professor
Monica BOSCAIU, Universitat Politècnica de València, Instituto Agroforestal Mediterráneo (UPV), CPI, edificio 8E, Camino de Vera s/n, 46022 Valencia
Department of Agro-Forest Ecosystems, Professor
Published
2015-04-16
How to Cite
AL HASSAN, M., MARTÍNEZ FUERTES, M., RAMOS SÁNCHEZ, F. J., VICENTE, O., & BOSCAIU, M. (2015). Effects of Salt and Water Stress on Plant Growth and on Accumulation of Osmolytes and Antioxidant Compounds in Cherry Tomato. Notulae Botanicae Horti Agrobotanici Cluj-Napoca, 43(1), 1-11. https://doi.org/10.15835/nbha4319793
Section
Research Articles