Involvement of nitric oxide in light-mediated greening of barley seedlings

Zhang, Lingang; Wang, Yading; Zhao, Liqun; Su-yun, Shi; Zhang, Lixin

doi:10.1016/j.jplph.2005.07.011

Cited by 79 publications

(54 citation statements)

References 26 publications

(41 reference statements)

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“…We also observed that hot5-2 was significantly less vigorous and had reduced chlorophyll when grown under long days (16 h light) (growth conditions used by Feechan et al [2005] in studying pathogen resistance). NO is reported to accumulate in chloroplasts and to stimulate photosynthetic electron transport (Zhang et al, 2006). Thus, NO accumulation could be affected by differences in photoperiod and might alter chloroplast development and chlorophyll biosynthesis.…”

Section: Discussionmentioning

confidence: 99%

“…Thus, NO accumulation could be affected by differences in photoperiod and might alter chloroplast development and chlorophyll biosynthesis. Previous studies indicate that NO broadly participates in the plant life cycle, from germination to seedling and mature plant growth (Beligni and Lamattina, 2000;Bethke et al, 2006;Zhang et al, 2006), and then decreases in senesced leaves . Thus, GSNOR activity can be expected to have an effect on all of these processes.…”

Section: Discussionmentioning

confidence: 99%

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Modulation of Nitrosative Stress byS-Nitrosoglutathione Reductase Is Critical for Thermotolerance and Plant Growth inArabidopsis

et al. 2008

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Nitric oxide (NO) is a key signaling molecule in plants. This analysis of Arabidopsis thaliana HOT5 (sensitive to hot temperatures), which is required for thermotolerance, uncovers a role of NO in thermotolerance and plant development. HOT5 encodes S-nitrosoglutathione reductase (GSNOR), which metabolizes the NO adduct S-nitrosoglutathione. Two hot5 missense alleles and two T-DNA insertion, protein null alleles were characterized. The missense alleles cannot acclimate to heat as darkgrown seedlings but grow normally and can heat-acclimate in the light. The null alleles cannot heat-acclimate as light-grown plants and have other phenotypes, including failure to grow on nutrient plates, increased reproductive shoots, and reduced fertility. The fertility defect of hot5 is due to both reduced stamen elongation and male and female fertilization defects. The hot5 null alleles show increased nitrate and nitroso species levels, and the heat sensitivity of both missense and null alleles is associated with increased NO species. Heat sensitivity is enhanced in wild-type and mutant plants by NO donors, and the heat sensitivity of hot5 mutants can be rescued by an NO scavenger. An NO-overproducing mutant is also defective in thermotolerance. Together, our results expand the importance of GSNOR-regulated NO homeostasis to abiotic stress and plant development. INTRODUCTIONNitric oxide (NO) is a short-lived, endogenously produced radical that acts as a signaling molecule in all higher organisms Wendehenne et al., 2004;Delledonne, 2005;Crawford, 2006;Besson-Bard et al., 2008). Despite its deceivingly simple structure, the rich chemistry of NO in biological systems gives rise to multiple secondary and tertiary reaction products, greatly complicating our mechanistic understanding of NO-related effects (Stamler and Hausladen, 1998;Mancardi et al., 2004;Ridnour et al., 2004). Directly and via its various chemical transformations, NO not only accomplishes signaling functions but also acts as a redox modulator with both antioxidant (by quenching other radical reactions) and pro-oxidant (through the production of reactive nitrogen species; RNS) properties. In addition to effects on redox status, the formation of RNS leads to nitrosation, nitrosylation, and nitration reactions with other molecules. Most of the regulatory effects of NO are thought to be mediated through posttranslational protein modifications, including heme nitrosylation, Tyr nitration, Cys nitrosation, and even glutathiolation (Lindermayr et al., 2005;Aracena-Parks et al., 2006;Wang et al., 2006b;West et al., 2006;Zaninotto et al., 2006).In plants, NO is believed to be produced via two different enzymatic pathways (Guo et al., 2003;Crawford, 2006). In one pathway, it is generated by nitrate reductase through the successive reduction of nitrate to nitrite and further to NO. In the other pathway, L-Arg, plus oxygen and NADPH, is converted to NO and citrulline by the action of a NO synthase, although the actual existence and identity of plant NO synthase is currently unres...

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Modulation of Nitrosative Stress byS-Nitrosoglutathione Reductase Is Critical for Thermotolerance and Plant Growth inArabidopsis

et al. 2008

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“…Enhanced ROS production in mitochondria of animal cells with a silenced NOA1/RIF1 homolog might also explain the observed decline in NO levels (Parihar et al, 2008). However, the observations that the pale phenotype of noa1/rif1 plants can be rescued by application of NO donors (Guo et al, 2003;He et al 2004;Flores-Pé rez et al, 2008) and that NO stimulates chlorophyll biosynthesis and chloroplast differentiation (Graziano et al, 2002;Zhang et al, 2006) suggest that the low NO levels found in the mutant might contribute to the observed pigmentation defects rather than just being a consequence.…”

Section: A Role For Plastids In the Control Of No Levelsmentioning

confidence: 99%

Hunting for Plant Nitric Oxide Synthase Provides New Evidence of a Central Role for Plastids in Nitric Oxide Metabolism

et al. 2009

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Nitric oxide (NO) has emerged as a central signaling molecule in plants and animals. However, the long search for a plant NO synthase (NOS) enzyme has only encountered false leads. The first works describing a pathogen-induced NOS-like plant protein were soon retracted. New hope came from the identification of NOS1, an Arabidopsis thaliana protein with an atypical NOS activity that was found to be targeted to mitochondria in roots. Although concerns about the NO-producing activity of this protein were raised (causing the renaming of the protein to NO-associated 1), compelling data on its biological role were missing until recently. Strong evidence is now available that this protein functions as a GTPase that is actually targeted to plastids, where it might be required for ribosome function. These and other results support the argument that the defective NO production in loss-of-function mutants is an indirect effect of interfering with normal plastid functions and that plastids play an important role in regulating NO levels in plant cells.

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“…A diverse function of NO has been reported in plants. These include stimulation of seed germination (Beligni and Lamattina, 2000), modulation of plant growth and development (Durner and Klessig, 1999), plant maturation and senescence (Leshem et al, 1998;Guo and Crawford, 2005), suppression of floral transition (He et al, 2004), mediation of stomatal movement (García-Mata and Lamattina, 2001;Neill et al, 2002;Guo et al, 2003;Desikan et al, 2004;Bright et al, 2006), and involvement of light-mediated greening (Zhang et al, 2006a). NO has also been involved in responses to abiotic and biotic stresses, such as drought, salt, and heat stresses, disease resistance, and apoptosis (Delledonne et al, 1998;Durner and Klessig, 1999;García-Mata and Lamattina, 2002;Zhao et al, 2004;Zhang et al, 2006b).…”

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confidence: 99%

Nitric Oxide Synthase-Dependent Nitric Oxide Production Is Associated with Salt Tolerance in Arabidopsis

2007

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Nitric oxide (NO) has emerged as a key molecule involved in many physiological processes in plants. To characterize roles of NO in tolerance of Arabidopsis (Arabidopsis thaliana) to salt stress, effect of NaCl on Arabidopsis wild-type and mutant (Atnoa1) plants with an impaired in vivo NO synthase (NOS) activity and a reduced endogenous NO level was investigated. Atnoa1 mutant plants displayed a greater Na 1 to K 1 ratio in shoots than wild-type plants due to enhanced accumulation of Na 1 and reduced accumulation of K 1 when exposed to NaCl. Germination of Atnoa1 seeds was more sensitive to NaCl than that of wild-type seeds, and wild-type plants exhibited higher survival rates than Atnoa1 plants when grown under salt stress. Atnoa1 plants had higher levels of hydrogen peroxide than wild-type plants under both control and salt stress, suggesting that Atnoa1 is more vulnerable to salt and oxidative stress than wild-type plants. Treatments of wild-type plants with NOS inhibitor and NO scavenger reduced endogenous NO levels and enhanced NaCl-induced increase in Na 1 to K 1 ratio. Exposure of wild-type plants to NaCl inhibited NOS activity and reduced quantity of NOA1 protein, leading to a decrease in endogenous NO levels measured by NO-specific fluorescent probe. Treatment of Atnoa1 plants with NO donor sodium nitroprusside attenuated the NaCl-induced increase in Na 1 to K 1 ratio. Therefore, these findings provide direct evidence to support that disruption of NOSdependent NO production is associated with salt tolerance in Arabidopsis.

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Involvement of nitric oxide in light-mediated greening of barley seedlings

Cited by 79 publications

References 26 publications

Modulation of Nitrosative Stress byS-Nitrosoglutathione Reductase Is Critical for Thermotolerance and Plant Growth inArabidopsis

Modulation of Nitrosative Stress byS-Nitrosoglutathione Reductase Is Critical for Thermotolerance and Plant Growth inArabidopsis

Hunting for Plant Nitric Oxide Synthase Provides New Evidence of a Central Role for Plastids in Nitric Oxide Metabolism

Nitric Oxide Synthase-Dependent Nitric Oxide Production Is Associated with Salt Tolerance in Arabidopsis

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