Abstract
Key message
The genetic basis of soybean root system architecture (RSA) and the genetic relationship between shoot and RSA were revealed by integrating data from recombinant inbred population grafting and QTL mapping.
Abstract
Variations in root system architecture (RSA) affect the functions of roots and thus play vital roles in plant adaptations and agricultural productivity. The aim of this study was to unravel the genetic relationship between RSA traits and shoot-related traits in soybean. This study characterized RSA variability at seedling stage in a recombinant inbred population, derived from a cross between cultivated soybean C08 and wild soybean W05, and performed high-resolution quantitative trait locus (QTL) mapping. In total, 34 and 41 QTLs were detected for RSA-related and shoot-related traits, respectively, constituting eight QTL clusters. Significant QTL correspondence was found between shoot biomass and RSA-related traits, consistent with significant correlations between these phenotypes. RSA-related QTLs also overlapped with selection regions in the genome, suggesting the cultivar RSA could be a partial consequence of domestication. Using reciprocal grafting, we confirmed that shoot-derived signals affected root development and the effects were controlled by multiple loci. Meanwhile, RSA-related QTLs were found to co-localize with four soybean flowering-time loci. Consistent with the phenotypes of the parental lines of our RI population, diminishing the function of flowering controlling E1 family through RNA interference (RNAi) led to reduced root growth. This implies that the flowering time-related genes within the RSA-related QTLs are actually contributing to RSA. To conclude, this study identified the QTLs that determine RSA through controlling root growth indirectly via regulating shoot functions, and discovered superior alleles from wild soybean that could be used to improve the root structure in existing soybean cultivars.
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Acknowledgements
This work was supported by grants from the Hong Kong Research Grants Council Area of Excellence Scheme (AoE/M-403/16) and the Lo Kwee-Seong Biomedical Research Fund to H-ML, the Hong Kong Scholars Program (XJ2020019) to CH, and UWA Research Collaboration Awards (2022/GR000814) to YC and H-ML. We would like to thank Ms. Jee Yan Chu for copy-editing this manuscript. Any opinions, findings, conclusions, or recommendations expressed in this publication do not reflect the views of the Government of the Hong Kong Special Administrative Region or the Innovation and Technology Commission.
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This work was supported by Hong Kong Research Grants Council Area of Excellence Scheme (AoE/M‐403/16) and Lo Kwee-Seong Biomedical Research Fund awarded to H-ML, and UWA Research Collaboration Awards (2022/GR000814) to YC and H-ML. CH was supported by the Hong Kong Scholars Program (XJ2020019).
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All authors contributed to the study conception and design. H-ML coordinated and supervised the project. F-LW and CW prepared RI lines materials. ZW, SL and YC designed and set up the semi-hydroponic platform for root phenotyping and phenotypic data collection. ZW, CH, F-LW, C-KM, C-CS, AL and W-SY performed grafting assays and phenotypic data collection. ZW, QW and C-KM performed phenotypic data analyses. ZW, M-WL, YN, CH, ZX, MH and XW performed QTL mapping and locus analyses. YN calculated FST values. LL, WH and TH generated the transgenic soybean lines. ZW and M-WL wrote the first draft of the manuscript. CH, W-SY, YN, ZX, MH and AL commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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Wang, Z., Huang, C., Niu, Y. et al. QTL analyses of soybean root system architecture revealed genetic relationships with shoot-related traits. Theor Appl Genet 135, 4507–4522 (2022). https://doi.org/10.1007/s00122-022-04235-4
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DOI: https://doi.org/10.1007/s00122-022-04235-4