Physiological Control of Chloride Transport in Chara corallina1: II. THE ROLE OF CHLORIDE AS A VACUOLAR OSMOTICUM
AUTOR(ES)
Sanders, Dale
RESUMO
The extent to which Cl− is replaceable as the major anionic constituent of the vacuole of Chara corallina was investigated. It was found that external Cl− is not essential in order for nongrowing cells to increase internal osmotic pressure. After growth of cells in low (9 micromolar) Cl−, the vacuolar Cl− concentration is one-half that of cells grown at normal external Cl− concentration (850 micromolar). In contrast, both internal osmotic pressure and total concentration of the major cations, K+ and Na+, in the same cells were found to be only slightly sensitive to the external Cl− concentration. Thus, it is proposed that, at limiting external Cl− concentration, the cell is able to transport or synthesize another anion for vacuolar use rather than utilize a neutral solute.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=427498Documentos Relacionados
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