NDLI: Inhibition of darkness-induced stomatal closure by ethylene involves a removal of hydrogen peroxide from guard cells of Vicia faba

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Inhibition of darkness-induced stomatal closure by ethylene involves a removal of hydrogen peroxide from guard cells of Vicia faba

Content Provider	Springer Nature Link
Author	Song, X. G. She, X. P. Wang, J.
Copyright Year	2012
Abstract	Ethylene regulates many aspects of plant growth and development; however, its effect on the behavior of the stomata is still largely obscure. Here, the association between ethylene inhibition of darkness-induced stomatal closure and hydrogen peroxide (H$_{2}$O$_{2}$) levels in Vicia faba guard cells was studied. Like ascorbic acid (ASA), the most important reducing substrate for H$_{2}$O$_{2}$ removal, catalase (CAT), one of H$_{2}$O$_{2}$-scavenging enzymes, and diphenylene iodonium (DPI), an inhibitor of the H$_{2}$O$_{2}$-generating enzyme NADPH-oxidase, both ethylene-releasing compound 2-chloroethylene phosphonic acid (ethephon, ETH) and 1-aminocyclopropane-1-carboxylic acid (ACC), the immediate precursor of ethylene, were found to inhibit stomatal closure by darkness and to reduce H$_{2}$O$_{2}$ levels in guard cells, indicating that ethylene-caused inhibition of darkness-induced stomatal closure involves reduction in the H$_{2}$O$_{2}$ level in guard cells. Additionally, similar to ASA and CAT, ACC/ETH not only suppressed H$_{2}$O$_{2}$-induced stomatal closure and H$_{2}$O$_{2}$ level in guard cells treated with exogenous H$_{2}$O$_{2}$ in the light, but also reopened the stomata, which had been closed by darkness, and reduced H$_{2}$O$_{2}$ level that had been generated by darkness, showing that ethylene causes H$_{2}$O$_{2}$ removal from guard cells. However, the above-mentioned effect of ACC/ETH was dissimilar from that of DPI, which not only was incapable to reduce H$_{2}$O$_{2}$ level induced by exogenous H$_{2}$O$_{2}$ but also could not abolish H$_{2}$O$_{2}$ that had been generated by darkness. Thus, we suggest that ethylene probably induces H$_{2}$O$_{2}$ removal and reduces H$_{2}$O$_{2}$ level in guard cells and finally inhibits stomatal closure induced by darkness. Furthermore, the mechanism of H$_{2}$O$_{2}$ removal caused by ethylene was also discussed.
Starting Page	372
Ending Page	380
Page Count	9
File Format	PDF
ISSN	10214437
Journal	Russian Journal of Plant Physiology
Volume Number	59
Issue Number	3
e-ISSN	16083407
Language	English
Publisher	SP MAIK Nauka/Interperiodica
Publisher Date	2012-04-15
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Vicia faba darkness ethylene guard cell hydrogen peroxide stomatal closure Plant Physiology Plant Sciences
Content Type	Text
Resource Type	Article
Subject	Plant Science

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