Alleviation of heat damage to photosystem II by nitric oxide in tall fescue
- 6 July 2013
- journal article
- Published by Springer Science and Business Media LLC in Photosynthesis Research
- Vol. 116 (1), 21-31
- https://doi.org/10.1007/s11120-013-9883-5
Abstract
Nitric oxide (NO) has been found to mediate plant responses to heat stress. The objective of this study was to investigate the protective role of NO in the recovery process of photosystem II (PSII) in tall fescue (Festuca arundinacea) against heat stress. Treatment of tall fescue leaves with NO donor sodium nitroprusside significantly improved the overall behavior of PSII probed by the chlorophyll a fluorescence transients, while the inhibition of NO accumulation by 2-phenyl-4,4,5,5-tetramethyl-imidazoline-1-oxyl-3-oxide (PTIO, a NO scavenger) plus N G-nitro-l-arginine-methyl ester (L-NAME, NO synthase inhibitor) dramatically disrupted the operation of PSII. Specifically, under heat stress, the exogenous NO reduced the initial fluorescence (F 0), increased the maximal quantum yield (F V/F M), and disappeared the K-step of 0.3 ms. By the analysis of the JIP-test, the exogenous NO improved the quantum yield of the electron transport flux from Q A to Q B (ET0/ABS), and decreased the trapped excitation flux per reaction center (RC) (TR0/RC), electron transport flux per RC (ET0/RC), and electron flux reducing end electron acceptors per RC (RE0/RC). In addition, the exogenous NO reduced the content of H2O2, O 2 •− , and malondialdehyde and electrolyte leakage of tall fescue leaves. These data suggest that exogenous NO could protect plants, increase the amount of activated RC and improve the electron transport from oxygen evolving complex to D1 protein. Moreover, quantitative RT-PCR revealed that, in the presence of hydrogen peroxide, NO induced the gene expression of psbA, psbB, and psbC, which encode proteins belonging to subunits of PSII core reaction center (Psb) complex. These findings indicate that, as an important strategy to protect plants against heat stress, NO could improve the recovery process of PSII by the up regulation of the transcriptions of genes encoding PSII core proteins.Keywords
This publication has 57 references indexed in Scilit:
- Heat Reduces Nitric Oxide Production Required for Auxin-Mediated Gene Expression and Fate Determination in Tree Tobacco Guard Cell ProtoplastsPlant Physiology, 2012
- Nitric oxide participates in cold‐responsive phosphosphingolipid formation and gene expression in Arabidopsis thalianaNew Phytologist, 2010
- Identification and expression analysis of genes in response to high-salinity and drought stresses in Brassica napusActa Biochimica et Biophysica Sinica, 2009
- Heat stress: an overview of molecular responses in photosynthesisPhotosynthesis Research, 2008
- The promoters of Arabidopsis thaliana genes AtCOX17‐1 and ‐2, encoding a copper chaperone involved in cytochrome c oxidase biogenesis, are preferentially active in roots and anthers and induced by biotic and abiotic stressPhysiologia Plantarum, 2006
- Specific loss of the extrinsic 18 KDa protein from Photosystem II upon heating to 47 °C causes inactivation of oxygen evolution likely due to Ca release from the Mn-complexPhotosynthesis Research, 2005
- Photosystem II: the engine of lifeQuarterly Reviews of Biophysics, 2003
- Nitric oxide interferes with plant photo‐oxidative stress by detoxifying reactive oxygen speciesPlant, Cell & Environment, 2002
- Heat stress induces in leaves an increase of the minimum level of chlorophyll fluorescence, Fo: A time-resolved analysisPhotosynthesis Research, 1996
- Too much of a good thing: light can be bad for photosynthesisTrends in Biochemical Sciences, 1992