Changes in the composition of phenolic compounds and antioxidant properties of grapevine roots and leaves (Vitis vinifera L.) under continuous of long-term drought stress

Abstract

Grapevine seedlings Vitis vinifera L. were grown in a greenhouse under optimum conditions (soil moisture ca 70 %) and under drought stress (soil moisture ca 30 %). Drought stress caused reduction in total phenolic compounds in grapevine leaves and roots, where were identified tree phenolic acids: caffeic acid, p-coumaric acid and ferulic acid. All acids found in leaves and roots occurred in the ester-bound form. Only caffeic acid in leaves appeared in the free and ester-bound form. Caffeic acid was present in the highest concentrations. The content of ferulic acid was the lowest in both tissues. The levels of all phenolic acids in leaves and roots decreased significantly under the drought stress. All the extracts from grapevine leaves and roots had antioxidative properties, but the antiradical activity of the extracts obtained from roots subjected to drought stress was lower to the control. The results of the analysis revealed that long-term drought stress caused a decrease in selected elements of secondary metabolism in such a different plant tissues that are the leaves and roots of the grapevine.

Characterization of the adaptive response of grapevine (cv. Tempranillo) to UV-B radiation under water deficit conditions

“…Similarly, Doupis, et al [16] observed that the activity of antioxidant enzymes in grapevine leaves did not significantly increase under water-stress. More recently, Król, et al [45] have reported that the antioxidant activity of grapevine leaves can even decrease under long-term drought stress, as happened with CAT activity in the present study (Table 3). Such decrease in CAT activity, may involve a decreased capacity to scavenge oxygen peroxide under water deficit conditions.…”

Hooker's or Warty Barberry? Physiological Background Analysis for Choosing the Right one into Ornamental Plantations Endangered by Drought

“…Liu et al (2011), analysing responses of six woody plant species to rising drought level, described the onset of chlorophyll and carotenoid breakdown at mild stress, when free proline accumulation and antioxidant defence started to increase. Similarly to our work and that of Król et al (2014), severe drought caused a decrease in these parameters.…”

“…Grapevine leaves and roots subjected to long-term drought in the study of Król et al (2014) exhibited lower total antioxidant activity of the hydrophilic phase than in watered plants. We observed similar situation in our study.…”

Multifunctional biomolecules with roles in abiotic stress tolerance as well as nutraceutical potential

“…Al Hassan et al (2015) reported that total phenolic content and flavonoids of tomato increased under salinity and water deficit, as reported by Kiarostami et al (2010) in Rosmarinus officinalis under saline conditions and by Petridis et al (2012) in Olea europaea L. under water stress. On the other hand, Król et al (2014) reported that long-term drought stress led to reduction in total phenolic compounds and phenolic acid in grapevine leaves and roots.…”