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Plant function and evolutionary biology
RESEARCH ARTICLE

Methylglyoxal metabolism is altered during defence response in pigeonpea (Cajanus cajan (L.) Millsp.) against the spotted pod borer (Maruca vitrata)

Sukhmanpreet Kaur A , Satvir Kaur Grewal https://orcid.org/0000-0001-7217-1069 A * , Gaurav Kumar Taggar B and Rachana D. Bhardwaj https://orcid.org/0000-0002-1537-0974 A
+ Author Affiliations
- Author Affiliations

A Department of Biochemistry, Punjab Agricultural University, Ludhiana, India.

B Pulses Section, Department of Plant Breeding and Genetics, Punjab Agricultural University, Ludhiana, India.

* Correspondence to: satvir_pau@pau.edu

Handling Editor: Nieves Fernandez-Garcia

Functional Plant Biology 51, FP23155 https://doi.org/10.1071/FP23155
Submitted: 17 July 2023  Accepted: 26 December 2023  Published: 25 January 2024

© 2024 The Author(s) (or their employer(s)). Published by CSIRO Publishing

Abstract

Pigeonpea (Cajanus cajan) production can be affected by the spotted pod borer (Maruca vitrata). Here, we identified biochemical changes in plant parts of pigeonpea after M. vitrata infestation. Two pigeonpea genotypes (AL 1747, moderately resistant; and MN 1, susceptible) were compared for glyoxalase and non-glyoxalase enzyme systems responsible for methylglyoxal (MG) detoxification, γ-glutamylcysteine synthetase (γ-GCS), glutathione–S-transferase (GST) and glutathione content in leaves, flowers and pods under control and insect-infested conditions. MN 1 had major damage due to M. vitrata infestation compared to AL 1747. Lower accumulation of MG in AL 1747 was due to higher activities of enzymes of GSH-dependent (glyoxylase I, glyoxylase II), GSH-independent (glyoxalase III) pathway, and enzyme of non-glyoxalase pathway (methylglyoxal reductase, MGR), which convert MG to lactate. Decreased glyoxylase enzymes and MGR activities in MN 1 resulted in higher accumulation of MG. Higher lactate dehydrogenase (LDH) activity in AL 1747 indicates utilisation of MG detoxification pathway. Higher glutathione content in AL 1747 genotype might be responsible for efficient working of MG detoxification pathway under insect infestation. Higher activity of γ-GCS in AL 1747 maintains the glutathione pool, necessary for the functioning of glyoxylase pathway to carry out the detoxification of MG. Higher activities of GST and GPX in AL 1747 might be responsible for detoxification of toxic products that accumulates following insect infestation, and elevated activities of glyoxylase and non-glyoxylase enzyme systems in AL 1747 after infestation might be responsible for reducing reactive cabanoyl stress. Our investigation will help the future development of resistant cultivars.

Keywords: carbonyl stress, glutathione, induced defence response, insect resistance, Maruca vitrata, methylglyoxal detoxification, pigeonpea.

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