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Profiling Thiol Redox Proteome Using Isotope Tagging Mass Spectrometry

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Glutathione and Ascorbic Acid Accumulation in Mango Pulp Under Enhanced UV-B Based on Transcriptome.

Hassam Tahir^1,2, Muhammad Sajjad^1,2, Minjie Qian^1,2

¹Sanya Institute of Breeding and Multiplication, Hainan University, Sanya 572025, China.

Antioxidants (Basel, Switzerland)

|November 27, 2024

Summary

Mango pulp responds to UV-B stress by activating antioxidant pathways. This study details molecular and biochemical changes in mango fruit, revealing how it detoxifies reactive oxygen species (ROS) and conserves antioxidants under environmental stress.

Keywords:

Mangifera indica (Tainong 1)ascorbic acid enhanced UV-B radiation glutathione transcriptome

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Fluorescent Visualization of Mango-tagged RNA in Polyacrylamide Gels via a Poststaining Method

Fluorescent Visualization of Mango-tagged RNA in Polyacrylamide Gels via a Poststaining Method

Published on: June 21, 2019

Area of Science:

Plant Physiology
Molecular Biology
Biochemistry

Background:

UV-B radiation poses a significant environmental stressor for tropical fruits like mango (Mangifera indica).
UV-B exposure induces oxidative stress, disrupting essential physiological processes in fruit pulp.

Purpose of the Study:

To investigate the molecular and biochemical responses of mango pulp to UV-B stress.
To analyze changes in non-enzymatic parameters and the ascorbate-glutathione (AsA-GSH) cycle enzymes during fruit development under UV-B exposure.

Main Methods:

UV-B stress applied at 96 kJ/mol to mango fruit from unripe to mature stages over three years.
Biochemical assays to measure maturity index, reactive oxygen species (ROS), membrane permeability, and AsA-GSH cycle enzyme activities.
Transcriptomic analysis to identify differentially expressed genes (DEGs) in the AsA-GSH pathway, validated by qRT-PCR.

Main Results:

UV-B stress significantly altered non-enzymatic parameters and the activity of key AsA-GSH cycle enzymes, including GR, GGT, GST, GPX, G6PDH, GalLDH, APX, AAO, and MDHAR.
Transcriptomic analysis identified 18 DEGs related to the AsA-GSH cycle, indicating a complex genetic response to UV-B stress.
Mango pulp demonstrated an activated regulatory network for ROS detoxification and antioxidant conservation under UV-B stress.

Conclusions:

UV-B stress triggers a coordinated molecular and biochemical defense mechanism in mango pulp.
Understanding these responses provides insights into enhancing the resilience of tropical fruit crops to environmental stressors.
The study highlights the importance of the AsA-GSH cycle in managing oxidative stress in mango fruit.