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Red-light- and gibberellic-acid-enhanced α-galactosidase activity in germinating lettuce seeds, cv. Grand Rapids : Control by the axis.

Authors
  • Leung, D W
  • Bewley, J D
Type
Published Article
Journal
Planta
Publication Date
Aug 01, 1981
Volume
152
Issue
5
Pages
436–441
Identifiers
DOI: 10.1007/BF00385360
PMID: 24301117
Source
Medline
License
Unknown

Abstract

Dry lettuce (Lactuca sativa L.) "seeds" (achenes) contain α-galactosidase (EC 3.2.122) at a level which is maintained in the imbibed dormant state in darkness. Both red light (R) and gibberellic acid promote an increase in enzyme activity several hours prior to the completion of germination. Germination and enzyme activity are not essentially linked, however, for the latter can increase while the former is inhibited. α-Galactosidase activity increases within the cotyledons and the endosperm following R stimulation, but the axis is essential to perceive the stimulus and to promote and maintain the increase in enzyme activity. A diffusible factor (or factors) is produced by and-or released from irradiated axes, and it migrates to the cotyledons (and possibly endosperm) to promote the increase in α-galactosidase activity. Gibberellic acid, particularly in the presence of benzyladenine, can replace the requirement for irradiated axes.

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