Ascorbic acid biosynthesis
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Brazilian Journal of Plant Physiology
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Since the first isolation of ascorbic acid (AsA) in 1928, few papers have been published regarding the biosynthesis of AsA in
plants, especially in fruits. It took as long as 1998, before Wheeler, Jones and Smirnoff, based on a study with Arabidopsis
leaves, proposed what can be considered the main pathway of biosynthesis of AsA, in which L-galactose (L-GAL) is a key
precursor. This paper reports the effectiveness of some precursors (cold or radiolabeled) in the biosynthesis of AsA in different
plants: green sweet pepper, white-pulp guava, red-pulp guava, papaya and strawberry at two ripening stages (mature green and
ripe for papaya and mature green and half red for strawberry) and broccoli. The ‘Smirnoff-Wheeler’ pathway was functioning
and active in all sources studied, as demonstrated by the increase in AsA contents and incorporation of labeled precursors into
AsA. In papaya, the AsA content in the ripe fruit was higher than in the mature green, indicating the synthesis of AsA during
ripening. On the other hand, the AsA content in the mature green strawberry was similar to that of the half red fruits. Our data
demonstrate that L-GAL and L-Galactono-1,4-lactone (L-GL) are effective precursors for the biosynthesis of AsA in fruits and
also provided additional evidence for the participation of D-mannose (D-MAN) and D-glucose-1P in the biosynthesis of AsA
in plants.
Como referenciar
SOARES, A.D.B.; GOMEZ, M.L.P.A.; MESQUITA, C.H.; LAJOLO, F.M. Ascorbic acid biosynthesis: a precursor study on plants. Brazilian Journal of Plant Physiology, v. 16, n. 3, p. 147-154, 2004. DOI: 10.1590/s1677-04202004000300004. Disponível em: http://repositorio.ipen.br/handle/123456789/7593. Acesso em: 30 Dec 2025.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.