Light-induced starch degradation in non-dormant turions of Spirodela polyrhiza.

Abstract:

: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.

journal_name

Photochem Photobiol

authors

Appenroth KJ,Gabrys H

doi

10.1562/0031-8655(2001)073<0077:lisdin>2.0.co;2

subject

Has Abstract

pub_date

2001-01-01 00:00:00

pages

77-82

issue

1

eissn

0031-8655

issn

1751-1097

journal_volume

73

pub_type

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