PDF Notes: Fenech, 2019_Plant_vitamin C

    Master this deck with 15 terms through effective study methods.

    Generated from uploaded pdf

    Created by @paloika

    What is the main role of ascorbic acid in plants?

    Functions as an antioxidant and cofactor in redox reactions.

    How do humans obtain vitamin C?

    Through dietary sources like fruits and vegetables.

    What happens if ascorbate is deficient in the diet?

    Can lead to scurvy, characterized by skin impairment.

    What is the Smirnoff-Wheeler pathway?

    The primary pathway for ascorbate biosynthesis in plants.

    How does ascorbate affect iron absorption?

    Enhances iron absorption, crucial for various metabolic processes.

    What is the consequence of increasing ascorbate content in fruits?

    Improves fruit quality and stress tolerance.

    What distinguishes the ascorbate biosynthesis in plants from animals?

    Plants use a dehydrogenase instead of an oxidase, avoiding H2O2 production.

    What role does ascorbate play in collagen biosynthesis?

    Acts as a cofactor for enzymes that hydroxylate proline residues.

    What is the relationship between ascorbate and cell wall biosynthesis?

    Ascorbate precursors are also used in forming cell wall components.

    What happens to ascorbate levels during fruit ripening?

    Varies by species; can increase or decrease depending on the fruit.

    What is the effect of high light on ascorbate levels?

    Increases ascorbate biosynthesis to detoxify reactive oxygen species.

    What is the role of GGP in ascorbate regulation?

    Controls the translation of GGP mRNA based on ascorbate levels.

    How does the D-galacturonate pathway relate to ascorbate?

    Provides substrates for ascorbate synthesis during fruit ripening.

    What is the significance of ascorbate in epigenetic control?

    Involved in activating mechanisms that regulate gene expression.

    What are the major sources of ascorbate in the human diet?

    Fruits and vegetables, with tomatoes being a significant contributor.