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1 January 2001 Light-induced Starch Degradation in Non-dormant Turions of Spirodela polyrhiza
Klaus-J. Appenroth, Halina Gabrys
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Continuous red light controls starch degradation in turions of Spirodela polyrhiza [Dölger, K., U. K. Tirlapur and K.-J. Appenroth [1997] Photochem. Photobiol. 66, 126–127 (1997)]. This light could be replaced by repeated red light pulses with the reciprocity law fulfilled over a large range of fluence rates. The effect of red light pulses repeated every 24 or 12 h for 6 days was reversible by subsequent far-red light pulses. In contrast, hourly applied red pulses were irreversible by far-red light. This discrepancy was explained by showing the starch degradation activity of far-red pulses themselves. The investigated process was categorized as a phytochrome low fluence response with an unusual property: requirement of light treatment for several days. A partial fulfillment of this requirement was obtained with a red pulse followed by a dark period and a 24 h continuous irradiation. These results suggest the existence of two separate steps in the process of starch degradation in turions: formation of a sprout (=sink) during the pulse-induced germination, and starch degradation in the storage tissue (=source) induced by the second light treatment.

Klaus-J. Appenroth and Halina Gabrys "Light-induced Starch Degradation in Non-dormant Turions of Spirodela polyrhiza," Photochemistry and Photobiology 73(1), 77-82, (1 January 2001).<0077:LISDIN>2.0.CO;2
Received: 27 July 2000; Accepted: 1 October 2000; Published: 1 January 2001

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