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Genome wide association study of MAGIC population reveals a novel QTL for salinity and sodicity tolerance in rice

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Abstract

The present study was conducted to identify the novel QTLs controlling salinity and sodicity tolerance using indica MAGIC rice population. Phenotyping was carried out in salinity (EC ~ 10 dS/m) and sodicity (pH ~ 9.8) at the seedling stage. Among 391 lines, 43 and 98 lines were found tolerant and moderately tolerant to salinity. For sodicity condition, 2 and 45 lines were showed tolerance and moderately tolerance at seedling stage. MAGIC population was genotyped with the help of genotyping by sequencing (GBS) and filtered 27041SNPs were used for genome wide marker trait association studies. With respect to salinity tolerance, 25 SNPs were distributed on chromosomes 1, 5, 11 and 12, whereas 18 SNPs were mapped on chromosomes 6, 4 and 11 with LOD value of > 3.25 to sodicity tolerance in rice. The candidate gene analysis detected twelve causal genes including SKC1 gene at Saltol region for salinity and six associated genes for sodic stress tolerance. The significant haplotypes responsible for core histone protein coding gene (LOC_Os12g25120) and three uncharacterized protein coding genes (LOC_Os01g20710, LOC_Os01g20870 and LOC_Os12g22020) were identified under saline stress. Likewise, five significant haplotypes coding for ribose 5-phosphate isomerise (LOC_Os04g24140), aspartyl protease (LOC_Os06g15760), aluminum-activated malate transporter (LOC_Os06g15779), OsFBX421-Fbox domain containing protein (LOC_Os11g32940) and one uncharacterized protein (LOC_Os11g32930) were detected for sodic stress tolerance. The identified novel SNPs could be the potential candidates for functional characterization. These candidate genes aid to further understanding of genetic mechanism on salinity and sodicity stress tolerance in rice. The tolerant line could be used in future breeding programme to enhance the salinity and sodicity tolerance in rice.

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Acknowledgements

We thank Indian Council of Agricultural Research (ICAR), India and International Rice Research Institute (IRRI), Philippines for funding and sparing breeding materials, the GWAS, MAGIC team at IRRI for sparing GBS data and advice in data analysis and Central Soil Salinity Research Institute Karnal (PME Cell reference no Research Article/95/2019).

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Authors and Affiliations

  1. Central Soil Salinity Research Institute, Karnal, India

    S. L. Krishnamurthy, P. C. Sharma, D. Dewan, B. M. Lokeshkumar, Suman Rathor & A. S. Warraich

  2. Kuvempu University, Shankaraghatta, Shimvamogga, India

    N. M. Vinaykumar

  3. Division of Genetics and Biotechnology, IRRI, Los Baños, Philippines

    Hei Leung

  4. Division of Plant Breeding, IRRI, Los Baños, Philippines

    R. K. Singh

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SLK, PCS, RKS, HL design the experiment, edit the manuscript, SLK, ASW conducted experiments, draft the manuscript and analyze the data, DD, SR NMV, ASW, BML performed the analysis of data, wrote and revised the manuscript.

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Correspondence to S. L. Krishnamurthy, P. C. Sharma or R. K. Singh.

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Krishnamurthy, S.L., Sharma, P.C., Dewan, D. et al. Genome wide association study of MAGIC population reveals a novel QTL for salinity and sodicity tolerance in rice. Physiol Mol Biol Plants 28, 819–835 (2022). https://doi.org/10.1007/s12298-022-01174-8

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