alexa Cytosolic alkalization and cytosolic calcium oscillation in Arabidopsis guard cells response to ABA and MeJA.
Microbiology

Microbiology

Journal of Antivirals & Antiretrovirals

Author(s): Islam MM, Hossain MA, Jannat R, Munemasa S, Nakamura Y,

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Abstract Abscisic acid (ABA)- and methyl jasmonate (MeJA)-induced stomatal closure are accompanied by cytosolic alkalization in guard cells. However, it remains to be clarified how the alkalization functions in not only ABA signaling but also MeJA. We investigated cytosolic alkalization in guard cells during ABA-, MeJA- and Ca(2+)-induced stomatal closure of wild type, abi1-1, abi2-1, ost1-2 and coi1 using a pH-sensitive fluorescent dye, BCECF-AM. ABA induced cytosolic alkalization in guard cells of wild-type and coi1 but not in ost1-2 guard cells whereas MeJA elicited cytosolic alkalization in wild-type and ost1-2 guard cells but not in coi1. Neither ABA nor MeJA induced cytosolic alkalization in abi1-1 and abi2-1 guard cells. Exogenous Ca(2+) induced stomatal closure accompanied by cytosolic alkalization in guard cells of wild-type, abi1-1, abi2-1, ost1-2 and coi1 plants. An agent to acidify cytosol, butyrate, suppressed Ca(2+)-induced cytosolic alkalization and ABA-, MeJA- and Ca(2+)-induced cytosolic Ca(2+) oscillation in wild-type guard cells to prevent stomatal closure. These results indicate that cytosolic alkalization and cytosolic Ca(2+) oscillation coordinately function in ABA and MeJA signaling in Arabidopsis guard cells. This article was published in Plant Cell Physiol and referenced in Journal of Antivirals & Antiretrovirals

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