Relationship between apoplastic ascorbate regeneration and the stimulation of root growth in Allium cepa L.
1994; Elsevier BV; Volume: 100; Issue: 1 Linguagem: Inglês
10.1016/0168-9452(94)90130-9
ISSN1873-2259
AutoresJosé A. González‐Reyes, Francisco J. Alcaı́n, J. A. Caler, Antonio Serrano, Francisco Córdoba, Plácido Navas,
Tópico(s)Advanced oxidation water treatment
ResumoAscorbate free radical stimulated onion root growth when bulbs were incubated at 15°C and 25°C. The fully oxidized form, dehydroascorbate, was inhibitory. Ascorbate only stimulated cell elongation if it underwent appreciable autoxidation at 25°C or at 15°C in the presence of small amounts of Cu2+. When ascorbate oxidation was inhibited, no stimulation of root growth was found at 25°C. Ascorbate oxidation rate was lower in the presence of onion roots, indicating that ascorbate free radical may be used as an electron acceptor for the transplasma membrane redox system regenerating ascorbate. The activation of this system could explain the reported growth stimulation.
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