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Twenty years of mining salt tolerance genes in soybean

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Abstract

Current combined challenges of rising food demand, climate change and farmland degradation exert enormous pressure on agricultural production. Worldwide soil salinization, in particular, necessitates the development of salt-tolerant crops. Soybean, being a globally important produce, has its genetic resources increasingly examined to facilitate crop improvement based on functional genomics. In response to the multifaceted physiological challenge that salt stress imposes, soybean has evolved an array of defences against salinity. These include maintaining cell homeostasis by ion transportation, osmoregulation, and restoring oxidative balance. Other adaptations include cell wall alterations, transcriptomic reprogramming, and efficient signal transduction for detecting and responding to salt stress. Here, we reviewed functionally verified genes that underly different salt tolerance mechanisms employed by soybean in the past two decades, and discussed the strategy in selecting salt tolerance genes for crop improvement. Future studies could adopt an integrated multi-omic approach in characterizing soybean salt tolerance adaptations and put our existing knowledge into practice via omic-assisted breeding and gene editing. This review serves as a guide and inspiration for crop developers in enhancing soybean tolerance against abiotic stresses, thereby fulfilling the role of science in solving real-life problems.

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Acknowledgements

This work was supported by grants from the Guangdong Provincial Department of Science and Technology 2020 Key Areas Research and Development Programs: Breeding for High-Yield and High-Quality New Soybean Varieties for Tropics and Subtropics (2020B020220008), the Hong Kong Research Grants Council Area of Excellence Scheme (AoE/M-403/16) and the Lo Kwee-Seong Biomedical Research Fund. Ms. Jee Yan Chu copy-edited the manuscript. Any opinions, findings, conclusions, or recommendations expressed in this publication do not reflect the views of the Government of the Hong Kong Special Administrative Region or the Innovation and Technology Commission.

Funding

The work was supported by the Guangdong Provincial Department of Science and Technology 2020 Key Areas Research and Development Programs: Breeding for High-Yield and High-Quality New Soybean Varieties for Tropics and Subtropics (2020B020220008), the Hong Kong Research Grants Council Area of Excellence Scheme [AoE/M-403/16] and Lo Kwee-Seong Biomedical Research Fund awarded to H-ML.

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H-ML conceptualized the manuscript. L-YC, C-HL, and H-SL co-wrote the first draft. L-YC, C-HL, H-SL, M-WL and H-ML reviewed and edited the manuscript.

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Correspondence to Hon-Ming Lam.

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The authors declare no conflicts of interest.

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This article is part of the Topical Collection on Soybean Functional Genomics.

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Leung, HS., Chan, LY., Law, CH. et al. Twenty years of mining salt tolerance genes in soybean. Mol Breeding 43, 45 (2023). https://doi.org/10.1007/s11032-023-01383-3

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  • DOI: https://doi.org/10.1007/s11032-023-01383-3

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