Antioxidant defences in olive trees during drought stress: changes in activity of some antioxidant enzymes

Functional Plant Biology : FPB
Adriano SofoAndrea Masia

Abstract

The effects of drought on the activities of superoxide dismutase (SOD), catalase (CAT), ascorbate peroxidase (APX), guaiacol peroxidase (POD), indoleacetate oxidase (IAAox) and polyphenol oxidase (PPO) were studied in 2-year old Olea europaea L. (cv. 'Coratina') plants grown under high temperatures and irradiance levels and gradually subjected to a controlled water deficit. After 20 d without irrigation, mean predawn leaf water potential fell from -0.37 to -5.37 MPa, and decreases in net photosynthesis and transpiration occurred. The activities of SOD, APX, CAT and POD increased in relation to the severity of drought stress in both leaves and roots. In particular, a marked increase in APX activity was found in leaves of plants at severe drought stress. CAT activity increased during severe water deficit conditions in leaves and fine roots. The patterns of POD and IAA oxidase activity ran in parallel and showed increases in relation to the degree of drought. In contrast, PPO activity decreased during the progression of stress in all the tissues studied. The results show that the ability of olive trees to up-regulate the enzymatic antioxidant system might be an important attribute linked to drought tolerance. This could limit cell...Continue Reading

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Citations

Jun 25, 2020·Functional Plant Biology : FPB·Maryam RezayianHassan Ebrahimzadeh
Aug 15, 2019·Plant, Cell & Environment·Anna K BlockShawn A Christensen
Nov 28, 2017·Tree Physiology·Hagar FoxRakefet David-Schwartz
Feb 6, 2008·Physiologia Plantarum·Sonja Veljovic-JovanovicFlavia Navari-Izzo
Apr 1, 2010·Journal of the Science of Food and Agriculture·Theocharis ChatzistathisGregorios Diamantidis
Apr 16, 2015·Journal of Experimental Botany·Tinne BoeckxAlison H Kingston-Smith
Aug 16, 2017·Journal of Zhejiang University. Science. B·Li-Qiang SuXiao-Feng Wang
Mar 1, 2006·Functional Plant Biology : FPB·Sotiria StavrianakouGeorge Karabourniotis
Oct 18, 2020·Ecotoxicology and Environmental Safety·Marijana MarkovicAnu Kumar
Mar 10, 2010·Journal of Agricultural and Food Chemistry·Chedlia Ben AhmedFerjani Ben Abdullah

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