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Light-activated H+ transport in the vacuole of Valonia ventricosaстатья
Информация о цитировании статьи получена из
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Web of Science
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
- Авторы: Gyenes M., Bulychev A.A., Kurella G.A., Perez Alvarez P.
- Журнал: Journal of Experimental Botany
- Том: 32
- Номер: 6
- Год издания: 1981
- Издательство: Oxford University Press
- Местоположение издательства: United Kingdom
- Первая страница: 1273
- Последняя страница: 1277
- DOI: 10.1093/jxb/32.6.1273
- Аннотация: Using glass capillary microelectrodes for the measurement of potential differences (PD) and antimony microelectrodes for the measurement of pH, we investigated the light-induced changes of PD between the central vacuole and the external medium, of pH in the vacuole (pHv), as well as of pH in the external medium (pHo) of the green marine alga Valonia ventricosa. PD in the dark was about +30 to +40 mV (vacuole positive), pHv 6.3, and the resistance of the protoplast (cell wall-plasmalemma-tonoplast) 17.8 kOhm cm2. Illumination caused an increase of the positive PD (after a few oscillations) up to +80 to +100 mV, acidification of the vacuolar sap, alkalinization of the external medium, and a decrease in the resistance of the protoplast to 7.6 kOhm cm2. The kinetics of the changes of PD, pHv, and pHo were similar to each other. It is concluded that a light-stimulated active H+ flow occurs from the external medium into the central vacuole of Valonia ventricosa as a result of the onset of photosynthetic activity.
- Добавил в систему: Булычев Александр Александрович