Abstract

GABRIEL, Julio; VERAMENDI, Silene; ANGULO, Ada  and  MAGNE, Jury. Response of potato varieties improved (Solanum tuberosum L.) to water stress by drought. J. Selva Andina Biosph. [online]. 2013, vol.1, n.1, pp.33-44. ISSN 2308-3867.

In order to evaluate the antioxidant response to water stress by drought in seven improved varieties, we assessed the enzymatic activity of catalase (CAT), ascorbate peroxidase (ASPX) and guayacol peroxidase (POX). The results showed that the Aurora, Victoria and Jaspe varieties were resistance to water stress by drought and showed higher values in the enzymatic activity of CAT, ASPX and POX, that their own controls. This confirmed that these varieties were more resistant to water stress by drought. In contrast, clones 00-216-3, 00-207-6 and Desirée and Salome varieties, showed resistance and lower values than their controls. However, the Salome variety with 20 days of drought water stress contrary to what was expected showed high levels of enzyme activity compared to controls. This suggested that this variety probably had other mechanisms of resistance to water stress by drought that allowed more dramatic reaction to drought stress. Finally, cuticular permeability showed that Aurora and Victoria varieties had low chlorophyll content in reference to its controls that showed high chlorophyll content.

Keywords : Antioxidant enzymes; enzyme activity; chlorophyll; resistance; severity.

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