Water Stress Enhances Expression of Genes Encoding Plastid Terminal Oxidase and Key Components of Chlororespiration and Alternative Respiration in Soybean Seedlings
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Xin Sun
,
Cui-Qin Yang
Plastid terminal oxidase (PTOX) is a plastid-localized plastoquinone (PQ) oxidase in plants. It functions as the terminal oxidase of chlororespiration, and has the potential ability to regulate the redox state of the PQ pool. Expression of the PTOX gene was up-regulated in soybean seedlings after exposure to water deficit stress for 6 h. Concomitantly expression of the NDH-H gene, encoding a component of the NADPH dehydrogenase (NDH) complex which is a key component of both chlororespiration and NDH-dependent cyclic electron transfer (CET), was also up-regulated. Transcript levels of the proton gradient regulation (PGR5) gene, which encodes an essential component of the PGR5-dependent CET, were not affected by water stress, while the expression of the alternative oxidase (AOX1) gene, which encodes a terminal oxidase of alternative respiration in mitochondria, was also up-regulated under water stress. Therefore, our results indicate that water stress induced the up-regulation of genes encoding key components of chlororespiration and alternative respiration. Transcript levels of the AOX1 gene began to increase in response to water stress before those of PTOX suggesting that alternative respiration may react faster to water stress than chlororespiration.
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Articles in the same Issue
- Excelsoside: A New Benzylic Diglycoside from the Leaves of Milicia excelsa
- Elatumic Acid: A New Ursolic Acid Congener from Omphalocarpum elatum Miers (Sapotaceae)
- Synthesis and Antimicrobial Activities of Oxazepine and Oxazocine Derivatives
- A New Isoxazolic Compound Acts as α7 Nicotinic Receptor Agonist in Human Umbilical Vein Endothelial Cells
- Water Stress Enhances Expression of Genes Encoding Plastid Terminal Oxidase and Key Components of Chlororespiration and Alternative Respiration in Soybean Seedlings
- Plant-Mediated Stereoselective Biotransformation of Phenylglyoxylic Acid Esters
- Spatiotemporal Expression Profile of the Pumilio Gene in the Embryonic Development of Silkworm
- In vitro Antiproliferative Effect of Helix aspersa Hemocyanin on Multiple Malignant Cell Lines
- (Z)-3-Dodecenoic Acid Is the Main Component of Full-Body n-Hexane Extracts from Two Acacia Gall-Inducing Thrips (Thysanoptera) and May Function as an Alarm Pheromone
- The Flavonols Quercetin, Myricetin, Kaempferol, and Galangin Inhibit the Net Oxygen Consumption by Immune Complex- Stimulated Human and Rabbit Neutrophils
