Literature summary for 1.6.5.4 extracted from

Stevens, R.; Page, D.; Gouble, B.; Garchery, C.; Zamir, D.; Causse, M.
Tomato fruit ascorbic acid content is linked with monodehydroascorbate reductase activity and tolerance to chilling stress (2008), Plant Cell Environ., 31, 1086-1096.

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Organism

Organism	UniProt	Comment	Textmining
Solanum pennellii	-	-	-

Source Tissue

Source Tissue	Comment	Organism	Textmining
fruit	the MDHAR enzyme is active in different stages of fruit ripening and shows increased activity in the introgression lines containing the wild-type (Solanum pennellii) allele, and responds to chilling injury in tomato along with the reduced/oxidized ascorbate ratio. Low temperature storage of different tomato introgression lines with all or part of the quantitative trait loci for ascorbic acid and with or without the wild MDHAR allele shows that enzyme activity explains 84% of the variation in the reduced ascorbic acid levels of tomato fruit following storage at 4 °C, compared with 38% at harvest under non-stress conditions. A role is indicated for MDHAR in the maintenance of ascorbate levels in fruit under stress conditions. An increased fruit MDHAR activity and a lower oxidation level of the fruit ascorbate pool are correlated with decreased loss of firmness because of chilling injury	Solanum pennellii	-

Substrates and Products (Substrate)

Substrates	Comment Substrates	Organism	Products	Comment (Products)	Rev.	Reac.
NADH + monodehydroascorbate	-	Solanum pennellii	NAD+ + ascorbate	-	?

Synonyms

Synonyms	Comment	Organism
MDHAR	-	Solanum pennellii
monodehydroascorbate reductase	-	Solanum pennellii

Cofactor

Cofactor	Comment	Organism	Structure
NADH	-	Solanum pennellii

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Release 2023.1 (January 2023)