Diurnal Pattern of Salt Secretion in Leaves of the Black Mangrove, Avicennia marina, on the Sinai Coast of the Red Sea
Diurnal Pattern of Salt Secretion in Leaves of the Black Mangrove, Avicennia marina, on the Sinai Coast of the Red Sea
Date
1993-01
Authors
Ish-Shalom-Gordon, Naomi
Dubinsky, Zvy
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University of Hawaii Press
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Abstract
Avicennia marina (Forsk.) Vierh has a typical diurnal pattern of
salt gland activity, with high secretion rate during the day, a peak at noon,
declining after sunset, and remaining low throughout the night. The main factor
affecting the daily secretion rhythm was radiation, with a 2-hr time lag between
the radiation level and the corresponding secretion. This lag might be a result
of a salt accumulation phase, or of the time needed to build up photosynthetic
product pools, needed to generate ATP through the respiration process, for
active salt secretion. Differences between daily secretion patterns of young and
mature leaves were not significant, and temperature had little effect on controlling
the secretion rhythm.
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Ish-Shalom-Gordon N, Dubinsky Z. 1993. Diurnal pattern of salt secretion in leaves of the black mangrove, Avicennia marina, on the Sinai Coast of the Red Sea. Pac Sci 47(1): 51-58.
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