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Journal of Integrative Agriculture  2024, Vol. 23 Issue (8): 2525-2540    DOI: 10.1016/j.jia.2023.12.004
Special Issue: 水稻遗传育种Rice Genetics · Breeding · Germplasm Resources
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Exploring the genetic basis of pre-harvest sprouting in rice through a genome-wide association study-based haplotype analysis
Myeong-Hyeon Min1, Aye Aye Khaing2, Sang-Ho Chu1, Bhagwat Nawade1, Yong-Jin Park1

1 Department of Plant Resources, College of Industrial Sciences, Kongju National University, Yesan 32439, Republic of Korea

2 Department of Agronomy, Yezin Agricultural University, Nay Pyi Taw 15013, Myanmar

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Abstract  

In this study, we employed genome-wide association studies (GWAS) on diverse rice accessions to identify novel PHS-associated haplotypes.  An assessment of 127 cultivated accessions for panicle germination (PHS) and detached grain germination (germination rate of detached grains at the 14th day (D14)) revealed considerable phenotypic variation among rice ecotypes.  GWAS analysis identified 91 significant signals at –log10(P-value)>5, including 15 SNPs for PHS and 76 SNPs for D14.  A subsequent linkage disequilibrium (LD) block-based GWAS analysis detected 227 significant SNPs for both traits, consisting of 18 nonsynonymous substitutions located on the coding regions of nine genes.  Further haplotype analysis identified 32 haplotypes, with 10 specific to cultivated accessions, 19 specific to the wild type, and three shared between them.  A phenotypic assessment of major haplotypes revealed significant differences between resistant (Hap1 and Hap2) and susceptible haplotypes (Hap5, Hap27, and Hap28), distinguished by a G/A SNP within a novel gene, Os04g0545200.  The identified haplotypes offer promising prospects for haplotype-based breeding aimed at enhancing PHS resistance in rice.

Keywords:  rice       PHS        dormancy        germination        GWAS        haplotype        abiotic stress  
Received: 07 August 2023   Accepted: 24 October 2023
Fund: 
This work was supported by the National Research Foundation of Korea (NRF) grants funded by the Ministry of Science and Information and Communication Technology (MSIT), Republic of Korea (NRF-2022R1A4A1030348 and 2023R1A2C1004432) and the Korea Institute of Planning and Evaluation for Technology in Food, Agriculture and Forestry (IPET) through the Digital Breeding Transformation Technology Development Program, funded by the Ministry of Agriculture, Food and Rural Affairs (MAFRA), Republic of Korea (322060031HD020), and the Cooperative Research Program for Agriculture Science and Technology Development, Rural Development Administration, Republic of Korea (RS-2023-00222739).
About author:  #Correspondence Yong-Jin Park, Tel: +82-41-330-1201, Fax: +82-41-330-1209, E-mail: yjpark@kongju.ac.kr

Cite this article: 

Myeong-Hyeon Min, Aye Aye Khaing, Sang-Ho Chu, Bhagwat Nawade, Yong-Jin Park. 2024. Exploring the genetic basis of pre-harvest sprouting in rice through a genome-wide association study-based haplotype analysis. Journal of Integrative Agriculture, 23(8): 2525-2540.

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