Abstract
A stably inherited petal degeneration mutant pdm of the Chinese cabbage was obtained from its wild-type ‘FT’ by radiation treatment (60Co γ-rays) and isolated microspore culture. Petals of the pdm mutant were observed to be shriveled, degenerated, not fully expanded, and darker at the flowering stage than those of ‘FT.’ The pdm mutant phenotype was found to be controlled by a single recessive nuclear gene. For linkage analysis and gene map**, 1419 recessive homozygous individuals with the pdm phenotype of the F2 generation were investigated as the map** population. Results showed that the pdm was located between markers Indelhsn26 and SSRhsn123 at a genetic distance of 0.04 and 0.04 cM, respectively, on linkage group A01. Physical distance between Indelhsn26 and SSRhsn123, the two most closely linked markers, was estimated to be approximately 285.2 kb. Twenty-eight genes were predicted in the target region. Using RNA-seq, Bra040093 was predicted to be the most likely candidate gene for pdm. Based on gene annotation, Bra040093 encodes a peroxisomal acyl-coenzyme A oxidase 1 (ACX1). Comparison of the sequences in pdm and ‘FT’ revealed two single-nucleotide polymorphisms in pdm. Expression patterns of Bra040093 between pdm and ‘FT’ were analyzed using quantitative real-time PCR, and the expression level was dramatically higher in ‘FT’ than in pdm. These findings provide a solid foundation and valuable resources for map-based cloning, identification, and functional analysis of pdm and facilitate the understanding of floral development processes in the Chinese cabbage.
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Acknowledgments
This work was supported by grants from the National Natural Science Foundation of China (31201625 and 31272157), the National Sci-Tech Support Plan (2012BAD02B01-9), and the Postgraduate Innovation Cultivation Project of Shenyang Agricultural University.
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Shengnan Huang and Zhiyong Liu contributed equally to this work and share the first authorship.
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Fig. S1
Examples of makers tightly linked to pdm. (a) Polymorphism screened by part of the SSR primers between the two parents; (b) recombinant individuals with SSRhsn92 in the map** population; (c) recombinant individuals with SSRhsn87 in the map** population; (d) recombinant individuals with SSRhsn117 in the map** population; (e) recombinant individuals with SSRhsn123 in the map** population. M: Marker; P1: 11A150; P2: pdm; *: recombinant individuals (TIFF 40549 kb)
Fig. S2
Examination of PCR products by using agarose gel electrophoresis. M: Marker (TIFF 2948 kb)
Fig. S3
Sequence alignment analysis of Bra040093 in pdm and its wild-type ‘FT’ (TIFF 2730 kb)
Table S1
Primer sequences of SSR and Indel markers used in the gene map** of the pdm mutant (XLS 22 kb)
Table S2
Prediction of candidate genes within the gene-mapped region on linkage group A01 (XLS 23 kb)
Table S3
Differentially expressed genes of pdm and its wild-type ‘FT’ (XLS 51 kb)
Table S4
Sequencing results for BraA, BraB, BraC, and BraD in pdm and its wild-type ‘FT’ (DOC 33 kb)
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Huang, S., Liu, Z., Yao, R. et al. Candidate gene prediction for a petal degeneration mutant, pdm, of the Chinese cabbage (Brassica campestris ssp. pekinensis) by using fine map** and transcriptome analysis. Mol Breeding 36, 26 (2016). https://doi.org/10.1007/s11032-016-0452-4
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DOI: https://doi.org/10.1007/s11032-016-0452-4