Abstract
Cuticular wax is a complex mixture of very-long-chain fatty acid derivatives. The wax on the surface of plants serves as a protective barrier to reduce non-stomatal water loss and environmental damage. However, the loss of wax may lead to a glossy phenotype, which is an favorable trait in leafy vegetables. The mechanism of glossy mutants in non-heading Chinese cabbage (Brassica rapa L. var. communis) has not been studied yet. In this study, scanning electron microscopy (SEM) showed that the cuticular wax on the leaves and stem of a glossy mutant was dramatically reduced compared with that of the wild-type plant. Transmission electron microscopy (TEM) revealed that the cuticle ultrastructure of glossy mutant leaf and stem were altered when compared with the wild type. A cuticle wax analysis showed the total wax content of leaves, as well as alkanes, ketones and alcohols, was decreased. A genetic analysis indicated that the glossy phenotype was controlled by a single gene. Based on a homology analysis, the Brcer1 gene was identified as the candidate gene controlling the glossy phenotype. In the glossy mutant, a 39-bp deletion leads to an mRNA disruption and reduces the expression of the BrCER1 gene. Sequence analysis showed that a loss of function mutation in the Brcer1 gene was different from that of Cgl1, which was previously shown to be responsible for the glossy phenotype in B. oleracea, showing typical parallel selection. These findings provide a better understanding of the cuticular wax biosynthesis pathway and offer important information for molecular-assisted breeding of non-heading Chinese cabbage (B. rapa L. var. communis).
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Acknowledgments
This research was supported by the National Key Research and Developmet Program of China (2017YFD010803), the Fundamental Research Funds for the Central Universities (2662016PY106) and Special Fund for Agro-scientific Research in the Public Interest (201303014). The authors are grateful to Dr. Xuan Yao for critical reading of the manuscript and the anonymous reviewers for their constructive comments for revisions.
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Primers used in this study (DOC 13 kb)
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The natural cultivars used in this study (DOC 21 kb)
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Comparsion of cuticle permeability of leaf between 13S106 (WT) and 13S126 (glossy). The data represent means of mean values ± SE (n = 3). (DOCX 20 kb)
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Relative expression level of BrCER1 gene in leaves of 13S126 (glossy mutant) and 13S106 (WT). The gene in the figure were detected by quantitative RT-PCR. GAPC was used to as an internal control (DOCX 13 kb)
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Ten cultivars in non-heading Chinese cabbage used for validation of Brcer1 gene. WT (13S106); glossy (13S126); 1–5: inbred lines (waxy) 13S103, 13S104, 13,105, PC06, PC07; 6–10: inbred lines (glossy) PC08, 13S123, 13S125, 13S157, 13S170 (GIF 26 kb)
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Evolutionary relationships of CER1 homologous in Cruciferae (GIF 11 kb)
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Wang, C., Li, Y., Xie, F. et al. Cloning of the Brcer1 gene involved in cuticular wax production in a glossy mutant of non-heading Chinese cabbage (Brassica rapa L. var. communis). Mol Breeding 37, 142 (2017). https://doi.org/10.1007/s11032-017-0745-2
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DOI: https://doi.org/10.1007/s11032-017-0745-2