Abstract
Increasing crop tolerance to high salinity is an important breeding objective. Some accessions of wild species in the genus Vigna have high salinity tolerance. One accession of V. marina (JP247202) and V. luteola (JP233389) have been previously identified as salt tolerant. However, the mechanisms of tolerance remain elusive and research on the phenotypic responses to salt stress can be a starting point for identifying salt-tolerant mechanisms. This study evaluated plant growth, salt accumulation, PSII effective quantum yield and root system architecture, including total root length, root surface area and root tip number, of three accessions from two Vigna species in response to salt stress. Results showed (1) JP247202 invested in the growth of roots more than shoots under salt stress; (2) JP247202 in salt stress maintained the total root length and surface area as control; (3) JP247202 in salt stress grew more but shorter fine roots, and fewer but longer thick roots; (4) JP247202 in salt stress had a higher amount of water uptake per dry weight; (5) The leaves of JP233389 accumulated high amount of Na without damage, while similar Na accumulation severely damaged the leaves of JP235855, a salt-sensitive accession of V. luteola. In addition, while salt damage started from older leaves in JP235855, it started with younger leaves in JP233389. These findings will facilitate further understanding mechanisms of salt tolerance in V. marina and V. luteola and potentially provide insight into increasing salt tolerance in crop plants.
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Acknowledgements
This work was financially supported by Moonshot Research & Development Program for Agriculture, Forestry and Fisheries by Cabinet Office, Government of Japan (20350204). We appreciate Dr. Matthias Wissuwa and Dr. Juan Pariasca Tanaka for providing a facility for root scans and analyses. We appreciate Dr. Jimmy Burridge for his kind help in correcting and polishing English.
Funding
This work was financially supported by Moonshot Research & Development Program for Agriculture, Forestry and Fisheries by Cabinet Office, Government of Japan (JPJ009273).
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Wang, F., Iki, Y., Tanoi, K. et al. Phenotypic responses in the root of salt-tolerant accessions of Vigna marina and Vigna luteola under salt stress. Genet Resour Crop Evol (2023). https://doi.org/10.1007/s10722-023-01794-3
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DOI: https://doi.org/10.1007/s10722-023-01794-3