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Rooting hastened in onions by ascorbate and ascorbate free radical

✍ Scribed by R. C. de Cabo; J. A. González-Reyes; F. Córdoba; P. Navas

Publisher
Springer
Year
1996
Tongue
English
Weight
325 KB
Volume
15
Category
Article
ISSN
0721-7595

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✦ Synopsis

Treatment of onion bulbs with ascorbate or its free radical hastened root emergence on the basal plate in relation to treatments with water or dehydroascorbate. This stimulation was accompanied by a significant increase of DNA synthesis per primordium. After a 24-h imbibition, ascorbate and ascorbate free radical also increased cell length. Ascorbate and ascorbate free radical apparently activated the onset of cell proliferation in root primordia, resulting in a shortening in G1-S transition. The possible action of the ascorbate system at the plasma membrane level is discussed.

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Kinetics of the reaction of phenoxyl radicals (TO ") from a-tocopherol (TOxH) and with aseorbate (AH) (ascorbylpalmitate (AIH)) has been studied in benzene at 37°C by using ESR steady-state method as a model reaction between vitamin E and vitamin C in biological systems. The rate constants for these