Influence of nutrient availability on drought-induced changes in the activity o...

• Author(s): David, Maria Manuela ; Barrote, Isabel ; Correia, Maria João
• Date: 2006
• Persistent ID: http://hdl.handle.net/10400.1/1031
• Origin: Sapientia - Universidade do Algarve
• Subject(s): Stress hídrico; Helianthus annuus; Stress oxidativo; Deficiência em nutrientes
• Document Type: Conference Object
• Language: English

Description

We aimed to evaluate if plants with different nutrient availability evidenced a different capacity to overcome drought-induced oxidative stress. Membrane peroxidative damages as MDA concentration and the activity of several antioxidant enzymes were determined in leaves of well watered (WW) and water stressed (WS) H. annuus plants grown either with adequate (Adeq Nutr) or limited (Limit Nutr) nutrient regimes. Constitutive capacity to eliminate ROS was not overall changed by growing plants with different nutrient supply regimes, but a diverse enzyme-dependent response was observed. In response to drought SOD and DHAR activity increased only in plants with limited nutrient supply, while in plants with adequate nutrient supply the activity of these enzymes did not change and were constitutively higher, but the activity APX increased by 50%. The subtle observed changes in the activity of the antioxidant enzymes are discussed, given that no oxidative damage was observed.