Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Molecular Mapping To Identify Stable Salinity-Resilient QTLs From the Novel Landrace Akundi in Two Bi-Parental Populations Using SNP-Based 1k-RiCA Genotyping in Rice

Version 1 : Received: 24 May 2023 / Approved: 25 May 2023 / Online: 25 May 2023 (08:58:09 CEST)

How to cite: Maniruzzaman, S.; Rahman, M.A.; Hasan, M.; Rasul, G.G.; Molla, A.H.; Khatun, H.; Iftekharuddaula, K.M.; Akter, S. Molecular Mapping To Identify Stable Salinity-Resilient QTLs From the Novel Landrace Akundi in Two Bi-Parental Populations Using SNP-Based 1k-RiCA Genotyping in Rice. Preprints 2023, 2023051780. https://doi.org/10.20944/preprints202305.1780.v1 Maniruzzaman, S.; Rahman, M.A.; Hasan, M.; Rasul, G.G.; Molla, A.H.; Khatun, H.; Iftekharuddaula, K.M.; Akter, S. Molecular Mapping To Identify Stable Salinity-Resilient QTLs From the Novel Landrace Akundi in Two Bi-Parental Populations Using SNP-Based 1k-RiCA Genotyping in Rice. Preprints 2023, 2023051780. https://doi.org/10.20944/preprints202305.1780.v1

Abstract

Achieving high-yield potential is always the ultimate objective of any breeding program. However, various abiotic stresses like salinity, drought, cold, flood, and heat hampered rice productivity tremendously. Salinity is one of the most important abiotic stresses that adversely affect rice grain yield. The present investigation was undertaken to dissect new genetic loci, which are responsible for salt tolerance at the early seedling stage in rice. A bi-parental mapping population (F2:3) was developed from the cross between BRRI dhan28/Akundi, where BRRI dhan28 (BR28) is a salt-sensitive irrigated (boro) rice mega variety and Akundi is a highly salinity tolerant Bangladeshi origin indica rice landrace that is utilized as a donor parent. We report stable QTLs for salt tolerance from a common donor (Akundi) irrespective of two different genetic backgrounds (BRRI dhan49/Akundi and BRRI dhan28/Akundi). A robust 1k-Rice Custom Amplicon (1k-RiCA) SNP marker genotyping platform was used to genotype this bi-parental population. After eliminating markers with high segregation distortion, 886 polymorphic SNPs built a genetic linkage map covering 1526.5 cM of whole rice genome with an average SNP density of 1.72 cM for the 12 genetic linkage groups. A total of 12 QTLs for nine different salt tolerance-related traits were identified using QGene and inclusive composite interval mapping of additive and dominant QTL (ICIM-ADD) under salt stress on seven different chromosomes. All of these 12 new QTLs found unique, as no other map from the previous study has reported these QTLs in the similar chromosomal location and found them different from extensively studied Saltol, SKC1, OsSalT and salT locus. Twenty-eight significant digenic/epistatic interactions identified between chromosomal regions linked to or unlinked to QTLs. Akundi acts like a new alternate donor source of salt tolerance except for other usually known donors like Nona Bokra, Pokkali, Capsule, and Hasawi used in salt tolerance genetic analysis and breeding programs worldwide, including Bangladesh. Integration of the seven novel and stable QTLs (qSES1, qSL1, qRL1, qSUR1, qSL8, qK8, qK1) reported in this investigation will expedite the cultivar development that is highly tolerant to salt stress.

Keywords

genetic loci; salt tolerant indica germplasm (Akundi); single nucleotide polymorphisms (SNP); 1k-RiCA; Oryza sativa L.

Subject

Biology and Life Sciences, Biochemistry and Molecular Biology

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