Journal
PLANT PHYSIOLOGY AND BIOCHEMISTRY
Volume 109, Issue -, Pages 248-261Publisher
ELSEVIER FRANCE-EDITIONS SCIENTIFIQUES MEDICALES ELSEVIER
DOI: 10.1016/j.plaphy.2016.10.005
Keywords
Leaf senescence; Reactive oxygen species (ROS); Methyl viologen (MV); Antioxidant enzymes; SOD isoforms
Categories
Funding
- National Natural Science Foundation of China [31271655, 31571602]
- National Key Research and Development Plan of China [2016YFD0300200]
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To clarify the interaction between different antioxidant enzymes for monitoring oxidative stress and ROS burst in rice senescent leaves, we investigated the genotype-dependent alteration in temporal patterns of the O-2(center dot-) production rate, H2O2 content, and ROS-scavenging enzyme activities during leaf senescence in two rice genotypes, namely, the premature senescence of flag leaf (psf) mutant and its wild type. Results showed that the psf mutant differed obviously from its wild type in leaf O-2(center dot-) generation rate and H2O2 content accumulation, and the decreased activities of SOD, CAT, and APX in the psf leaves were strongly responsible for the increased ROS level and the accelerated leaf senescence. By contrast, the increase in POD activity was positively correlated with the senescence-related enhancement in O-2(center dot-) generation in rice leaves. Among various SOD isoforms, Mn SOD responded sensitively to the increasing O-2(center dot-) generation rate, whereas Cu/Zn SOD remained stable with the progression of leaf senescence. These findings suggest that the senescence-related decline in total SOD activity was mostly attributable to the downregulation of both the translation and transcription of Mn SOD isoform. This occurrence finally resulted in the collapse of SOD defense system and accelerated leaf senescence for the psf mutant. Furthermore, we presented the possible contribution of several Cu/Zn SOD expression patterns to the senescence-related O-2(center dot-) detoxification in different cell compartments. (C) 2016 Elsevier Masson SAS. All rights reserved.
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