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- Title
Reduced Glutathione is a Novel Regulator of Vernalization-Induced Bolting in the Rosette Plant Eustoma grandiflorum.
- Authors
Yanagida, Mototsugu; Mino, Masanobu; Iwabuchi, Masaki; Ogawa, Ken'ichi
- Abstract
The transition from the vegetative rosette stage to the reproductive growth stage (bolting) in the rosette plant Eustoma grandiflorum has a strict requirement for vernalization, a treatment that causes oxidative stress. Since we have shown that reduced glutathione (GSH) and its biosynthesis are associated with bolting in another rosette plant Arabidopsis thaliana, we here investigated whether a similar mechanism governs the vernalization-induced bolting of E. grandiflorum. Addition of GSH or its precursor cysteine, instead of vernalization, induced bolting but other thiols, dithiothreitol and 2-mercaptoethanol, did not. The inductive effect of vernalization on bolting was nullified by addition of buthionine sulfoximine (BSO), an inhibitor of GSH synthesis, without decreasing the plant growth rate. BSO-mediated inhibition of bolting was reversed by addition of GSH but not by cysteine. These indicate that vernalization-induced bolting involves GSH biosynthesis and is specifically regulated by GSH. Plant GSH increased during the early vernalization period along with the activity of &ggr;-glutamylcysteine synthetase that catalyzes the first step of GSH biosynthesis, although there was little change in amounts of GSH precursor thiols, cysteine and &ggr;-glutamylcysteine. These findings strongly suggest that vernalization stimulates GSH synthesis and synthesized GSH specifically determines the bolting time of E. grandiflorum.
- Subjects
VEGETATIVE propagation; VERNALIZATION; OXIDATIVE stress; GLUTATHIONE; ARABIDOPSIS thaliana; PLANT growth; BIOSYNTHESIS
- Publication
Plant & Cell Physiology, 2004, Vol 45, Issue 2, p129
- ISSN
0032-0781
- Publication type
Article
- DOI
10.1093/pcp/pch030