Abstract
Basidioma is the fruiting body of mushroom species. The deep understanding on the mechanism of basidioma development is valuable for mushroom breeding and cultivation. From winter mushroom (Flammulina velutipes), one of the top five industrially cultivated mushrooms, a novel putative Zn(II)2Cys6 transcription factor LFC1 with negative regulatory function in basidioma development was identified. The transcript level of lfc1 was dramatically decreased during basidioma development. Neither overexpression nor knockdown of lfc1 affected hyphal vegetative growth. However, knockdown of lfc1 could promote basidioma development and shorten cultivation time by 2 days, while overexpression of lfc1 delayed the optimal harvest time by 3 days. In the lfc1 knockdown strain, in which the lfc1 expression was reduced by 72%, mushroom yield and biological efficiency could be increased at least by 24%. Knockdown of lfc1 did not affect the shape of caps but significantly increased basidioma length and number, while its overexpression did not affect basidioma length but dramatically reduced basidioma number. In addition, rather than producing basidiomata with round caps as in wild type, the caps of basidiomata in the lfc1 overexpression mutants were significantly larger and the cap edge was wrinkled. RNA-seq analysis revealed that 455 genes had opposite transcriptional responses to lfc1 overexpression and knockdown. Some of them were previously reported as genes involved in basidioma development, including 3 hydrophobin encoding genes, 2 lectin encoding genes, FVFD16, an Eln2 ortholog encoding gene, and 3 genes encoding membrane components. As LFC1 homologs are widely present in mushroom species, lfc1 can be useful in mushroom breeding.
Key Points • A novel transcription factor LFC1 negatively regulates fruiting in winter mushroom • LFC1 regulated transcription of more than 400 genes. • Reduction of LFC1 expression could shorten cultivation time and increase yield. • lfc1 could be a potentially useful reference gene for mushroom breeding. |
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This study was funded by the National Natural Science Foundation of China (31970081), the National Key Basic Research Program of China (2014CB138302), and the special funds of Gansu Province for guiding scientific and technological innovation and development (2017zx-10).
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SL conceived and conducted the research. BX provided strains and genome sequences. TW performed experiments and wrote the manuscript. SL and CH edited the manuscript. SW, LZ, ZZ, and ZZ analyzed data. All the authors read and approved the manuscript.
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Wu, T., Hu, C., Xie, B. et al. A putative transcription factor LFC1 negatively regulates development and yield of winter mushroom. Appl Microbiol Biotechnol 104, 5827–5844 (2020). https://doi.org/10.1007/s00253-020-10642-8
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DOI: https://doi.org/10.1007/s00253-020-10642-8