Chitosan signaling in guard cells requires endogenous salicylic acid.

Autor:	Prodhan MY; a Graduate School of Environmental and Life Science , Okayama University , Okayama , Japan., Issak M; a Graduate School of Environmental and Life Science , Okayama University , Okayama , Japan., Nakamura T; a Graduate School of Environmental and Life Science , Okayama University , Okayama , Japan., Munemasa S; a Graduate School of Environmental and Life Science , Okayama University , Okayama , Japan., Nakamura Y; a Graduate School of Environmental and Life Science , Okayama University , Okayama , Japan., Murata Y; a Graduate School of Environmental and Life Science , Okayama University , Okayama , Japan.
Jazyk:	angličtina
Zdroj:	Bioscience, biotechnology, and biochemistry [Biosci Biotechnol Biochem] 2017 Aug; Vol. 81 (8), pp. 1536-1541. Date of Electronic Publication: 2017 Jun 06.
DOI:	10.1080/09168451.2017.1332979
Abstrakt:	An elicitor chitosan (CHT) induces stomatal closure but the mechanism remains to be clarified. A phytohormone salicylic acid (SA) is crucial for elicitor-induced defense signaling in plants. Here we investigated whether endogenous SA is required for CHT signaling in guard cells. In the SA-deficient nahG mutant, treatment of CHT did not induce either apoplastic reactive oxygen species (ROS) production or stomatal closure but co-treatment of CHT and SA induced both apoplastic ROS production and stomatal closure, indicating the involvement of endogenous SA in CHT-induced apoplastic ROS production and CHT-induced stomatal closure. Furthermore, CHT induced transient cytosolic free calcium concentration increments in the nahG mutant in the presence of exogenous SA but not in the absence of exogenous SA. These results provide evidence that endogenous SA is a crucial element in CHT-induced stomatal closure.
Databáze:	MEDLINE
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