Abstract
Rice grain size directly affects grain yield and is an important quantitative trait target. Many genes regulating grain size have been mapped and cloned in recent years. These genes not only play a single role on grain size regulation but have mutual interactive effect on grain size. Mining key allele combinations of grain-size regulating genes will favorite the pyramiding of favorable alleles in rice varieties with desired grain size and shape that meet people’s preferences. Here, we studied the effect of seven major grain-size regulating genes (GS3, GS5, GW8/OsSPL16, BG2, GS6, GS2 and TGW3) and their allele combinations on grain size-related traits (grain length, grain width, grain length width ratio, thousand grain weight), and established multiple regression equations to predict rice grain size. We found that alleles of seven genes displayed significant differences in rice grain size. Among the seven genes, GS3 gene played the most important effect in regulating grain size, pyramiding GS3 alleles with other alleles such as GS6-II/III allele could significantly enhance grain size or grain weight. Specific allele combination of GS3-A, GS2-ZH11, GS5-Zhenshan97, GS6-II/III, BG2-9311 and GW8-HJX74 can produce rice varieties with slender grains; allele combination of GS3-A, GS6-I, BG2-Nipponbare and TGW3-CW23 produce grains with higher grain weight. The regression equation model developed in this study provided a useful tool to predict rice grain size. These results would help in breeding rice varieties with ideal traits and high yield by pyramiding favorable alleles.
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Acknowledgements
Financial support for this research was supported by Research Fund of Maoming Branch, Guangdong Laboratory for Lingnan Modern Agriculture (No. 2022KF003). The author thanks the researchers that constructed the RFGB dataset which provide genotype and phenotype information of Rice 3 K.
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This work was supported by Research Fund of Maoming Branch, Guangdong Laboratory for Lingnan Modern Agriculture (2022KF003).
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GY and HL designed the project and revised the manuscript. SZ and JZ performed all the experiments, analyzed the data and wrote the manuscript. YZ helped revise the manuscript. HL, YL and YZ assisted in conducting experiments. All authors read and approved the final manuscript.
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Zhang, S., Zhang, J., Zhang, Y. et al. Mining and effect evaluation and prediction of natural allele combinations of rice grain-size regulating genes. Euphytica 219, 123 (2023). https://doi.org/10.1007/s10681-023-03254-6
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DOI: https://doi.org/10.1007/s10681-023-03254-6