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Identification of QTLs responsible for culturability, and fine-mapping of QTL qCBT9 related to callus browning derived from Dongxiang common wild rice (Oryza rufipogon Griff.)

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Abstract

Compared to japonica, the lower genetic transformation efficiency of indica is a technical bottleneck for rice molecular breeding. Specifically, callus browning frequently occurs during the culture of the elite indica variety 93-11, leading to poor culturability and lower genetic transformation efficiency. Here, 67 QTLs related to culturability were detected using 97 introgression lines (designated as 9DILs) derived from Dongxiang common wild rice (DXCWR, Oryza rufipogon Griff.) with 93-11 genetic background, explaining 4% ~12% of the phenotypic variations. The QTL qCBT9 on chromosome 9 was a primary QTL for reducing callus browning derived from DXCWR. Five 9DILs with light callus browning and high differentiation were screened. We evaluated the callus browning index (CBI) of 100 F2 population crossed of 93-11 and 9DIL71 and the recombinant plants screened from 3270 individuals. The qCBT9 was delimited to a ~148kb region between the markers X16 and X23. RNA-seq analysis of DEGs between 9DIL71 and 93-11 showed three upregulated DEGs (Os09g0526500, Os09g0527900, Os09g0528200,) and three downregulated DEGs (Os09g0526700, Os09g0526800, Os09g0527700) were located in the candidate region of qCBT9. Furthermore, callus browning may be involved in cell senescence and death caused by oxidative stress. The differentiation of indica and japonica in this region suggested that qCBT9 was possibly a vital QTL contributed to better culturability of japonica. Our results laid a foundation for further cloning of the gene for reduced callus browning in O. rufipogon, and also provided a new genetic resource and material basis for improving the culturability and genetic transformation efficiency of cultivated rice.

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Data availability

The RNA-seq data of 93-11 and 9DIL71 have been deposited in the Sequence Read Archive (SRA) under accession code PRJNA1062274.

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Acknowledgements

This project was supported by the National Natural Science Foundation of China (Grant Number 32172016) and Guided Project of Sanya Institute of China Agricultural University (Grant Number SYND-2021-4).

Funding

National Natural Science Foundation of China, 32172016, Kun Zhang , Sanya Yazhou Bay Science and Technology City, SYND-2021-4,Yongcai Fu

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X.L. performed the experiments, analyzed the data and wrote the manuscript. J.S. helped to assess the phenotype. Y.X. helped to identify the genotype of F2 population. M.C., Q.Z. and Y.L. helped to perform the experiments. K.Z. conceived and designed the experiments, analyzed the data, wrote and modified the manuscript. C.S. provided a good experiment platform and guided the experiment. Y.F. conceived and designed the experiments, supervised the research and modified the manuscript. All authors read and approved the final manuscript.

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Correspondence to Kun Zhang.

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Lou, X., Su, J., Xiong, Y. et al. Identification of QTLs responsible for culturability, and fine-mapping of QTL qCBT9 related to callus browning derived from Dongxiang common wild rice (Oryza rufipogon Griff.). Mol Breeding 44, 32 (2024). https://doi.org/10.1007/s11032-024-01470-z

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  • DOI: https://doi.org/10.1007/s11032-024-01470-z

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