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Abstract:

Solute content of stomata from intact onion cotyledons grown under either greenhouse or growth chamber conditions was followed over the course of a daily light cycle to determine patterns of osmoregulation. Initial opening of stomata was well correlated with guard cell potassium accumulation under both growth conditions. Subsequently, however, there was a consistent decrease in guard cell potassium content despite constant or increasing aperture. Although a secondary increase in potassium was sometimes observed during the second half of the light cycle, guard cell potassium content was poorly correlated with aperture. Sucrose levels in guard cells increased 60% during the period of declining potassium content, suggesting its use as an alternate osmoticum. Guard cells are postulated to use multiple pathways for the production of osmotica over the course of a complete daily cycle of stomatal movements.

Registro:

Documento: Artículo
Título:Use of potassium and sucrose by onion guard cells during a daily cycle of osmoregulation
Autor:Amodeo, G.; Talbott, L.D.; Zeiger, E.
Filiación:INGEBI, Vuelta de Obligado, 1428 Buenos Aires, Argentina
Department of Biology, Lab. of Biomed. and Environ. Sci., University of California, Los Angeles, CA 90024, United States
Palabras clave:Allium cepa; Osmoregulation; Potassium; Stomata; Sucrose
Año:1996
Volumen:37
Número:5
Página de inicio:575
Página de fin:579
DOI: http://dx.doi.org/10.1093/oxfordjournals.pcp.a028983
Título revista:Plant and Cell Physiology
Título revista abreviado:PLANT CELL PHYSIOL.
ISSN:00320781
CODEN:PCPHA
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00320781_v37_n5_p575_Amodeo

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Citas:

---------- APA ----------
Amodeo, G., Talbott, L.D. & Zeiger, E. (1996) . Use of potassium and sucrose by onion guard cells during a daily cycle of osmoregulation. Plant and Cell Physiology, 37(5), 575-579.
http://dx.doi.org/10.1093/oxfordjournals.pcp.a028983
---------- CHICAGO ----------
Amodeo, G., Talbott, L.D., Zeiger, E. "Use of potassium and sucrose by onion guard cells during a daily cycle of osmoregulation" . Plant and Cell Physiology 37, no. 5 (1996) : 575-579.
http://dx.doi.org/10.1093/oxfordjournals.pcp.a028983
---------- MLA ----------
Amodeo, G., Talbott, L.D., Zeiger, E. "Use of potassium and sucrose by onion guard cells during a daily cycle of osmoregulation" . Plant and Cell Physiology, vol. 37, no. 5, 1996, pp. 575-579.
http://dx.doi.org/10.1093/oxfordjournals.pcp.a028983
---------- VANCOUVER ----------
Amodeo, G., Talbott, L.D., Zeiger, E. Use of potassium and sucrose by onion guard cells during a daily cycle of osmoregulation. PLANT CELL PHYSIOL. 1996;37(5):575-579.
http://dx.doi.org/10.1093/oxfordjournals.pcp.a028983