Variation in antioxidant metabolism of young and mature leaves of Arabidopsis thaliana subjected to drought

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Abstract

Young and mature leaves of 4-week-old Arabidopsis plants were exposed to drought stress up to -2.54MPa of water potential (ψw) by withholding water supply for 7 days. The efficiency of photosystem (PS) II photochemistry, Fv/Fm, and chlorophylls (Chls) remained unaltered and quantum yield of PSII electron transport (ΦPSII) decreased slightly in drought-stressed young leaves, whereas F v/Fm decreased slightly and ΦPSII and Chls decreased by 40 and 24%, respectively, in drought-stressed mature leaves. Both young and mature leaves exhibited a considerable increase in non-photochemical quenching (NPQ) and xanthophyll-mediated photoprotection capacity in response to drought stress, with a greater level of NPQ in mature leaves. Although the drought-induced increase in non-enzymatic antioxidants in young and mature leaves, enzymatic antioxidants including catalase, peroxidase (POD), superoxide dismutase (SOD) and glutathione reductase (GR) substantially increased only in drought-stressed mature leaves. Plants recovered rapidly 24h after resupplying water, as indicated by that ψw, Fv/Fm and pigment contents returned to well-watered control levels, however, the activities of POD, SOD and GR remained high. The fact that drought-stressed mature leaves suffer more stress than drought-stressed young leaves suggests that developmental stages of leaves might contribute to the differential prevention of oxidative damage in plants exposed to drought.

Original languageEnglish
Pages (from-to)459-466
Number of pages8
JournalPlant Science
Volume166
Issue number2
DOIs
StatePublished - Feb 2004

Keywords

  • Antioxidant enzymes
  • Chlorophyll fluorescence quenching
  • Drought stress
  • Xanthophylls

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