Control of Wild Carrot Somatic Embryo Development by Antioxidants | Zendy

Brent A. Earnshaw | Zendy; Morris A. Johnson | Zendy

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Control of Wild Carrot Somatic Embryo Development by Antioxidants

Author(s) -

Brent A. Earnshaw,

Morris A. Johnson

Publication year - 1987

Publication title -

plant physiology

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 3.554

H-Index - 312

eISSN - 1532-2548

pISSN - 0032-0889

DOI - 10.1104/pp.85.1.273

Subject(s) - daucus carota , ascorbic acid , glutathione , embryo , somatic embryogenesis , vitamin c , somatic cell , endogeny , antioxidant , glutathione reductase , biochemistry , embryogenesis , biology , reductase , cell growth , chemistry , botany , enzyme , microbiology and biotechnology , food science , glutathione peroxidase , gene

As we previously reported for glutathione (GSH), both ascorbic acid (AA) and vitamin E were observed to suppress wild carrot (Daucus carota L.) somatic embryogenesis with little concomitant effect on biomass. Endogenous concentrations of AA were lower during embryo development than during cell proliferation, exhibiting a temporal pattern nearly identical to that of GSH. GSSG (oxidized GSH) reductase was found to be considerably more active in proliferating than in developing cultures, whereas no difference was evident in the case of dehydroascorbate (DHA) reductase. Both GSH and AA concentrations in these cells are governed by 2,4-D. These results show that redox status is a strong determinant of proliferative versus developmental growth and indicate that the mode of action of 2,4-D in this system may be explained at least in part by its influence on endogenous antioxidant levels.

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