Abstract
Nitric oxide (NO) effects on heat resistance of wheat (Triticum aestivum L.) coleoptiles induced by 24-epibrassinolide (24-EB) have been investigated. Coleoptiles’ survival after damaging heating (43°С, 10 min) increased when they were treated preliminarily with 5–200 nM of 24-EB. After 24-EB treatment, transient amplification of nitric oxide (NO) and also ROS (superoxide anion-radical (O •−2 ) and hydrogen peroxide) generation by coleoptiles was noted. Coleoptiles pretreatment with inhibitors of nitrate reductase and an enzyme similar to animal NO-synthase partially removed the increase of NO content caused by the action of 24-EB. Amplification of superoxide anion-radical generation caused by 24-EB was depressed under the influence of imidazole (NADPH-oxidase inhibitor). Calcium antagonists (EGTA and neomycin) largely neutralized the 24-EB-induced increase in generation of both O •−2 and NO. The increase in NO content in coleoptile tissues caused by 24-EB was almost completely leveled by antioxidants and partly by imidazole. 24-EB-induced enhancement of the superoxide anion-radical generation was partially suppressed by the action of NO scavenger PTIO (2-phenyl-4,4,5,5-tetramethylimidazoline-1-oxyl-3-oxide) and the inhibitors of nitrate reductase and an enzyme similar to animal NO-synthase. Positive 24-EB effect on the heat resistance of wheat coleoptiles was leveled by PTIO, inhibitors of enzymes that generate NO, antioxidants, an inhibitor of NADPH-oxidase imidazole, and calcium antagonists. A conclusion was made on the role of NO in brassinosteroid signal transduction inducing heat resistance development of coleoptiles and on the functional interaction between NO, ROS, and calcium ions as the signal mediators.
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Abbreviations
- BS:
-
brassinosteroids
- 24-EB:
-
24-epibrassinolide
- DMTU:
-
dimethylthiourea
- L-NAME:
-
NG-nitro-L-arginine methyl ester (NO-synthase inhibitor)
- NBT:
-
nitroblue tetrazolium
- PTIO:
-
2-phenyl-4,4,5,5-tetramethylimidazoline-1-oxyl-3-oxide (NO scavenger)
- SNP:
-
sodium nitroprusside
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Original Russian Text © Yu.V. Karpets, Yu.E. Kolupaev, 2018, published in Fiziologiya Rastenii, 2018, Vol. 65, No. 2, pp. 111–120.
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Karpets, Y.V., Kolupaev, Y.E. Participation of Nitric Oxide in 24-Epibrassinolide-Induced Heat Resistance of Wheat Coleoptiles: Functional Interactions of Nitric Oxide with Reactive Oxygen Species and Ca Ions. Russ J Plant Physiol 65, 177–185 (2018). https://doi.org/10.1134/S1021443718010053
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DOI: https://doi.org/10.1134/S1021443718010053