Jasmonates Induce Intracellular Alkalinization and Closure ofPaphiopedilumGuard Cells |
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| Authors: | GEHRING C A; IRVING H R; McCONCHIE R; PARISH R W |
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| Institution: | School of Botany, La Trobe University, Bundoora, Melbourne, Victoria, 3083, Australia Department of Pharmaceutical Biology and Pharmacology, Victorian College of Pharmacy, Monash University, 381 Royal Parade, Parkville, Melbourne, Victoria, 3052, Australia |
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| Abstract: | Jasmonates (jasmonic acid or methyl jasmonate) promote stomatalclosure inPaphiopedilum Supersuk(RHS, 1973) andP. tonsum(Rchb.f)Stein. Studies on guard cells loaded with pH dependent fluorescentdyes show that jasmonates cause intracellular alkalinizationof up to 0.5 pH units within 5 to 15 min. Jasmonate-inducedalkalinization always preceded stomatal closure and where alkalinizationwas not detected no closure occurred. Propionic acid inhibitedjasmonate-induced stomatal closure, suggesting that jasmonate-inducedintracellular alkalinization is involved in guard cell movements. BCECF; confocal microscopy; cytosolic pH; guard cells; jasmonic acid; methyl jasmonate; Paphiopedilum Supersuk(R. H. S.); Snarf-1; stomatal movements |
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