Abstract
Key message
Genetic models, QTLs and candidate gene for silique density on main inflorescence of rapeseed were identified.
Abstract
Silique density is one of the critical factors to determine seed yield and plant architecture in rapeseed (Brassica napus L.); however, the genetic control of this trait is largely unknown. In this study, the genetic model for silique density on main inflorescence (SDMI) of rapeseed was estimated according to the phenotypic data of P1 (an inbreed line with high SDMI), P2 (an inbreed line with low SDMI), F1, F2, BC1P1 and BC1P2 populations, revealing that SDMI is probably controlled by multi-minor genes with or without major gene. The QTLs for SDMI and its component characters including silique number on main inflorescence (SNMI) and main inflorescence length (MIL) were consequently mapped from a DH population derived from P1 and P2 by using a genetic linkage map constructed by restriction site-associated DNA sequencing (RAD seq) technology. A total of eight, 14 and three QTLs were identified for SDMI, SNMI and MIL under three environments, respectively, with an overlap among SDMI and SNMI in 55.7–75.4 cm on linkage group C06 which corresponding to 11.6–27.3 Mb on chromosome C06. Genomic resequencing was further conducted between a high- and a low-SDMI pool constructed from the DH population, and QTL-seq analysis identified a 0.15 Mb interval (25.98–26.13 Mb) from the C06-QTL region aforementioned. Transcriptome sequencing and qRT-PCR identified one possible candidate gene (BnARGOS) from the 0.15 Mb interval. This study will provide novel insights into the genetic basis of SD in rapeseed.
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The plant material and datasets employed in this study are available from the corresponding author on reasonable request.
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We thank for the financial support from the following findings.
Funding
This study was funded by the National Key R&D Program of China (2022ZD0400802) and Sichuan and Chongqing joint key R & D project (cstc2021jscx-cylhX0003).
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JM and WQ directed the experiment and revised the manuscript. XM and JW carried out the project and wrote the first draft of the manuscript. YG, PF, WN and RL conducted the phenotypic evaluation.
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Ma, X., Wang, J., Gu, Y. et al. Genetic analysis and QTL mapping for silique density in rapeseed (Brassica napus L.). Theor Appl Genet 136, 128 (2023). https://doi.org/10.1007/s00122-023-04375-1
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DOI: https://doi.org/10.1007/s00122-023-04375-1