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Annals of Botany 80: 485-489, 1997
© 1997 Annals of Botany Company

Jasmonates Induce Intracellular Alkalinization and Closure ofPaphiopedilumGuard Cells

C. A. GEHRING+,, H. R. IRVING, R. McCONCHIE§, and R. W. PARISH,

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

Received February 14, 1997 ; Accepted May 30, 1997 .

Jasmonates (jasmonic acid or methyl jasmonate) promote stomatal closure inPaphiopedilum Supersuk(RHS, 1973) andP. tonsum(Rchb.f) Stein. Studies on guard cells loaded with pH dependent fluorescent dyes show that jasmonates cause intracellular alkalinization of up to 0.5 pH units within 5 to 15 min. Jasmonate-induced alkalinization always preceded stomatal closure and where alkalinization was not detected no closure occurred. Propionic acid inhibited jasmonate-induced stomatal closure, suggesting that jasmonate-induced intracellular 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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