Hydrolysis of riboflavins in root exudates under iron deficiency and alkaline stress

Détails bibliographiques
Publié dans:	Plant physiology and biochemistry : PPB. - 1991. - 210(2024) vom: 01. Mai, Seite 108573
Auteur principal:	Bosch, Germán (Auteur)
Autres auteurs:	Fuentes, Marta, Erro, Javier, Zamarreño, Ángel M, García-Mina, José M
Format:	Article en ligne
Langue:	English
Publié:	2024
Accès à la collection:	Plant physiology and biochemistry : PPB
Sujets:	Journal Article Alkaline stress Bicarbonate Chlorosis Iron deficiency Lumichrome Riboflavins Root exudates Riboflavin TLM2976OFR plus... Iron E1UOL152H7 Plant Exudates

Description
Résumé:	Copyright © 2024 The Authors. Published by Elsevier Masson SAS.. All rights reserved. Riboflavins are secreted under iron deficiency as a part of the iron acquisition Strategy I, mainly when the external pH is acidic. In plants growing under Fe-deficiency and alkaline conditions, riboflavins have been reported to accumulate inside the roots, with very low or negligible secretion. However, the fact that riboflavins may undergo hydrolysis under alkaline conditions has been so far disregarded. In this paper, we report the presence of riboflavin derivatives and products of their alkaline hydrolysis (lumichrome, lumiflavin and carboxymethylflavin) in nutrient solutions of Cucumis sativus plants grown under different iron regimes (soluble Fe-EDDHA in the nutrient solution, total absence of iron in the nutrient solution, or two different doses of FeSO4 supplied as a foliar spray), either cultivated in slightly acidic (pH 6) or alkaline (pH 8.8, 10 mM bicarbonate) nutrient solutions. The results show that root synthesis and exudation of riboflavins is controlled by shoot iron status, and that exuded riboflavins undergo hydrolysis, especially at alkaline pH, with lumichrome being the main product of hydrolysis
Description:	Date Completed 09.05.2024 Date Revised 09.05.2024 published: Print-Electronic Citation Status MEDLINE
ISSN:	1873-2690
DOI:	10.1016/j.plaphy.2024.108573