Abstract
Background
Deficiency of vitamin E results in several neurological and age-related disorders in humans. Utilization of maize mutants with favourable vte4-allele led to the development of several α-tocopherol (vitamin E) rich (16–19 µg/g) maize hybrids worldwide. However, the degradation of tocopherols during post-harvest storage substantially affects the efficacy of these genotypes.
Methods and results
We studied the role of lipoxygenase enzyme and Lipoxygenase 3 (LOX3) gene on the degradation of tocopherols at monthly intervals under traditional storage up to six months in two vte4-based contrasting-tocopherol retention maize inbreds viz. HKI323-PVE and HKI193-1-PVE. The analysis revealed significant degradation of tocopherols across storage intervals in both the inbreds. Lower retention of α-tocopherol was noticed in HKI193-1-PVE. HKI323-PVE with the higher retention of α-tocopherol showed lower lipoxygenase activity throughout the storage intervals. LOX3 gene expression was higher (~ 1.5-fold) in HKI193-1-PVE compared to HKI323-PVE across the storage intervals. Both lipoxygenase activity and LOX3 expression peaked at 120 days after storage (DAS) in both genotypes. Further, a similar trend was observed for LOX3 expression and lipoxygenase activity. The α-tocopherol exhibited a significantly negative correlation with lipoxygenase enzyme and expression of LOX3 across the storage intervals.
Conclusions
HKI323-PVE with high tocopherol retention, low -lipoxygenase activity, and -LOX3 gene expression can act as a potential donor in the vitamin E biofortification program. Protein-protein association network analysis also indicated the independent effect of vte4 and LOX genes. This is the first comprehensive report analyzing the expression of the LOX3 gene and deciphering its vital role in the retention of α-tocopherol in biofortified maize varieties under traditional storage.
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Data Availability
All data needed to support the conclusions are included in this article. Additional data related to this paper can be requested from the corresponding author.
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Acknowledgements
First Author is thankful to Indian Council of Agricultural Research (ICAR) for providing Junior Research Fellowship (JRF) during Master’s degree programme.
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Authors acknowledge the Indian Council of Agricultural Research (ICAR) for providing financial support for the study through Consortia Research Platform on Biofortification in Selected Crops for Nutritional Security-Maize.
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SM: Investigation, Formal analysis, Roles/Writing - original draft; VM: Conceptualization, Resources, Supervision, Roles/Writing - original draft, Writing - review & editing; AK: Methodology, Software, Roles/Writing - original draft; RC: Methodology; NG: Methodology; SBR: Methodology; SD: Methodology; AUS: Resources; RUZ: Software; CNN: Conceptualization, Project administration; DKY: Conceptualization; FH: Conceptualization, Funding acquisition, Project administration, Resources, Supervision, Writing - review & editing.
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11033_2023_8820_MOESM2_ESM.tif
Supplementary Material 2. Fig. S2. Heat map of gene co-occurrence (a) and co-expression (b) among VTE4 and LOX proteins. cl364_1 = VTE4; LOX = LOX1; LOC542495 = LOX3; LOX4 = LOX4; LOX5 = LOX5; LOX6 = LOX6; L0 × 7 = LOX7; LOX8 = LOX8; Lox9 = LOX9; LOX10 = LOX10; LOX11 = LOX11; LOX12 = LOX12; GRMZM5G822593_P01 = LOX13
11033_2023_8820_MOESM3_ESM.docx
Supplementary Material 3. Table S1 The details of the vte4 and LOX genes and their proteins used for the protein-protein association studies
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Maman, S., Muthusamy, V., Katral, A. et al. Low expression of lipoxygenase 3 (LOX3) enhances the retention of kernel tocopherols in maize during storage. Mol Biol Rep 50, 9283–9294 (2023). https://doi.org/10.1007/s11033-023-08820-8
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DOI: https://doi.org/10.1007/s11033-023-08820-8