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PHOTOSYNTHATE PARTITIONING INTO Digitaria decumbens LEAF STARCH VARIES RHYTHMICALLY WITH RESPECT TO THE DURATION OF PRIOR INCUBATION IN CONTINUOUS DIM LIGHT *
Author(s) -
Britz Steven J.,
Hungerford Wayne E.,
Lee David R.
Publication year - 1985
Publication title -
photochemistry and photobiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.818
H-Index - 131
eISSN - 1751-1097
pISSN - 0031-8655
DOI - 10.1111/j.1751-1097.1985.tb01641.x
Subject(s) - starch , digitaria , incubation , biology , photosynthesis , botany , circadian rhythm , horticulture , food science , biochemistry , neuroscience
— In bright light the proportion of photosynthate stored as starch in leaves of Digitaria decumbens Stent, (pangolagrass) depends in a cyclic fashion on the duration of prior incubation in dim light. We suggest that a circadian rhythm, which runs during dim light conditions, controls the partitioning of photosynthate during subsequent bright light conditions. Varying the interval of dim light prior to transfer to bright light reveals this rhythm. The results emphasize the importance of endogenous timing mechanisms in relation to day and night length and the control of photoassimilate distribution and plant growth.