Ascorbate free radical stimulates onion root growth by increasing cell elongation

Ascorbate free radical increased the growth of Allium cepa roots by 20%. The nature of this stimulation was not related to cell proliferation, for neither cell cycle nor mitotic index was affected. However, an ascorbate free radical-mediated cell-size increase was observed in both meristematic and e...

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Bibliographic Details
Published in:Botanical gazette (Chicago, Ill.) Ill.), 1991-09, Vol.152 (3), p.282-288
Main Authors: Hidalgo, A. (Universidad de Cordoba, Cordoba, Spain), Garcia-Herdugo, G, Gonzalez-Reyes, J.A, Morre, D.J, Navas, P
Format: Article
Language:English
Subjects:
ACIDE ASCORBIQUE
ACIDO ASCORBICO
ACTIVIDAD ENZIMATICA
ACTIVITE ENZYMATIQUE
Adenosine triphosphatases
ADENOSINETRIPHOSPHATASE
ALLIUM CEPA
ASCORBIC ACID
Biological and medical sciences
Cell cycle
Cell growth
CELL MEMBRANES
CELL STRUCTURE
CELLS
CELLULE
CELULAS
Chemical agents
CONTAMINANTES
CRECIMIENTO
CROISSANCE
ENZYMIC ACTIVITY
ESTRUCTURA CELULAR
Free radicals
Fundamental and applied biological sciences. Psychology
GROWTH
GROWTH RATE
HIDROLASAS
HYDROLASE
HYDROLASES
INDICE DE CRECIMIENTO
MEMBRANAS CELULARES
MEMBRANE CELLULAIRE
Nitrates
Physiology
Plant physiology and development
Plants
PLASMA MEMBRANES
POLLUANT
POLLUTANTS
RACINE
RAICES
Root growth
ROOTS
SEMIDEHYDROASCORBATE
STRUCTURE CELLULAIRE
TAUX DE CROISSANCE
TONOPLAST
Vacuoles
Vegetative apparatus, growth and morphogenesis. Senescence
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Summary:Ascorbate free radical increased the growth of Allium cepa roots by 20%. The nature of this stimulation was not related to cell proliferation, for neither cell cycle nor mitotic index was affected. However, an ascorbate free radical-mediated cell-size increase was observed in both meristematic and elongating cells. Further, both plasma membrane- and tonoplast-associated ATPases were increased by ascorbate free radical, as were uptake of oxygen, nitrate, and sugars. The increase in plasma-membrane ATPase was in proportion to cell enlargement, while the effect on tonoplast was disproportionately greater. The results show an activation of the elongation component of root growth by ascorbate free radical without affecting the production of new meristematic cells.
ISSN:0006-8071
1940-1205
DOI:10.1086/337891