Abstract
Key message
A novel QTL, qCIR9.1 , that controls callus induction rate in anther culture was identified on chromosome 9 in rice, and based on RNA-seq data, Os09g0551600 was the most promising candidate gene.
Abstract
Anther culture, a doubled haploid (DH) technique, has become an important technology in many plant-breeding programmes. Although anther culturability is the key factor in this technique, its genetic mechanisms in rice remain poorly understood. In this study, we mapped quantitative trait loci (QTLs) responsible for anther culturability by using 192 recombinant inbred lines (RILs) derived from YZX (Oryza sativa ssp. indica) × 02428 (Oryza sativa ssp. japonica) and a high-density bin map. A total of eight QTLs for anther culturability were detected in three environments. Among these QTLs, a novel major QTL for callus induction rate (CIR) named qCIR9.1 was repeatedly mapped to a ~ 100 kb genomic interval on chromosome 9 and explained 8.39–14.14% of the phenotypic variation. Additionally, RNA sequencing (RNA-seq) was performed for the parents (YZX and 02428), low- (L-Pool) and high-CIR RILs (H-Pool) after 16 and 26 days of culture. By using the RNA of the bulked RILs for background normalization, the number of differentially expressed genes (DEGs) both between the parents and between the bulked RILs after 26 days of culture was drastically reduced to only 78. Among these DEGs, only one gene, Os09g0551600, encoding a high-mobility group (HMG) protein, was located in the candidate region of qCIR9.1. qRT-PCR analysis of Os09g0551600 showed the same results as RNA-seq, and the expression of this gene was decreased in the low-callus-induction parent (YZX) and L-Pool. Our results provide a foundational step for further cloning of qCIR9.1 and will be very useful for improving anther culturability in rice.
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Acknowledgements
We are grateful for the financial support for this work by the Research and Development Plan for Key Areas in Guangdong province (No. 2018B020206002) and the earmarked fund for Modern Agro-Industry Technology Research System of the Ministry of Agriculture and Rural Affairs of the People’s Republic of China (No. CARS-01-17)
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TG and HW designed and supervised the study. CH performed the experiments (phenotypic assessments and qRT-PCR) and drafted the manuscript in Chinese, JZ, CH and LS analysed the data, JZ helpd to analysis (RNA-seq and haplotype analysis) and interpret the results, and write, translate and improve the manuscript, CH, DZ and YH participated in anther culture experiments and phenotypic assessments, ZC, GY and WL provided constructive comments, and all authors read and approved the manuscript.
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Huang, C., Zhang, J., Zhou, D. et al. Identification and candidate gene screening of qCIR9.1, a novel QTL associated with anther culturability in rice (Oryza sativa L.). Theor Appl Genet 134, 2097–2111 (2021). https://doi.org/10.1007/s00122-021-03808-z
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DOI: https://doi.org/10.1007/s00122-021-03808-z