NDLI: Protection effect of nitric oxide on photosynthesis in rice under heat stress

Content Provider	Springer Nature Link
Author	Song, Lili Yue, Lulu Zhao, Huaqiang Hou, Meifang
Copyright Year	2013
Abstract	The effect of exogenous applied nitric oxide on photosynthesis under heat stress was investigated in rice seedlings. High temperature resulted in significant reductions of the net photosynthetic rate (P $_{N}$) due to non-stomatal components. Application of nitric oxide donors, sodium nitroprusside (SNP) or S-nitrosoglutathione (GSNO), dramatically alleviated the decrease of P $_{N}$ induced by high temperature. Chlorophyll fluorescence measurement revealed that high temperature caused significant increase of the initial fluorescence (F $_{o}$) and non-photochemical quenching (NPQ) whereas remarkable decrease of the maximal fluorescence (F $_{m}$), the maximal efficiency of PSII photochemistry (F $_{v}$/F $_{m}$), the actual PSII efficiency (Φ$_{PSII}$), and photochemical quenching (q $_{p}$). In the presence of SNP or GSNO pretreatment, the increase of F $_{o}$ and decrease of F $_{m}$, F $_{v}$/F $_{m}$, Φ$_{PSII}$ and q $_{p}$ were markedly mitigated, but NPQ was further elevated. Moreover, with SNP or GSNO pretreatment, H$_{2}$O$_{2}$ accumulation and electrolyte leakage induced by heat treatment were significantly reduced, whereas zeaxanthin content and carotenoid content relative to chlorophyll were elevated. The potassium salt of 2-(4-carboxyphenyl)-4,4,5,5-tetramethylimidazoline-1-oxyl-3-oxide (cPTIO), a specific NO scavenger, arrested NO donors mediated effects. These results suggest that NO can effectively protect photosynthesis from damage induced by heat stress. The activation effect of NO on photosynthesis may be mediated by acting as ROS scavenging, or/and alleviating oxidative stress via maintaining higher carotenoid content relative to chlorophyll or/and enhancing thermal dissipation of excess energy through keeping higher level of zeaxanthin content under heat stress.
Starting Page	3323
Ending Page	3333
Page Count	11
File Format	PDF
ISSN	01375881
Journal	Acta Physiologiae Plantarum
Volume Number	35
Issue Number	12
e-ISSN	18611664
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2013-09-11
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Nitric oxide Heat stress Photosynthesis Chlorophyll fluorescence Plant Physiology Plant Genetics & Genomics Plant Biochemistry Plant Pathology Plant Anatomy/Development Agriculture
Content Type	Text
Resource Type	Article
Subject	Physiology Plant Science Agronomy and Crop Science

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