Abstract
Key message
The ripening-induced MaBSD1 acts as a transcriptional activator, and might be involved in banana fruit ripening partly through directly activating the expression of two ripening-associated genes, MaEXP1/2.
Abstract
BSD (BTF2-like transcription factors, synapse-associated proteins and DOS2-like proteins) transcription factors are characterized by a typical BSD domain. However, little information is available concerning their possible roles in plant growth and development, especially in fruit ripening. In the present study, one BSD gene, designated as MaBSD1, was isolated from banana fruit. MaBSD1 has an open reading frame (ORF) of 921 bp which encodes a polypeptide of 306 amino acid residues with molecular weight of 34.80 kDa, and isoelectric point (pI) of 4.54. Subcellular localization and transcriptional activation assays showed that MaBSD1 was localized in both the nucleus and cytoplasm and possessed transcriptional activity. RT-qPCR and promoter activity analysis indicated that MaBSD1 was ethylene and ripening inducible, and the accumulation of MaBSD1 transcript was correlated well with the evolution of ethylene production and ripening process. Moreover, transient assay showed that MaBSD1 could activate the expression of two cell wall modification-related genes, MaEXP1/2, via directly interacting with their promoters. Together, these data suggest that ripening-induced MaBSD1 acts as a transcriptional activator and might be associated with banana fruit ripening, at least partially through directly activating the expression of MaEXP1/2, expanding the limited information concerning the BSD transcription factor in relation to fruit ripening.
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Abbreviations
- BSD:
-
BTF2-like transcription factors, synapse-associated proteins and DOS2-like proteins
- EXP:
-
Expansin
- GFP:
-
Green fluorescence protein
- ORF:
-
Open reading frame
- RT-qPCR:
-
Real-time quantitative polymerase chain reaction
- TF:
-
Transcription factor
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Acknowledgments
We thank Professor Seiichiro Hasezawa (Department of Integrated Biosciences, the University of Tokyo), Professor Shouyi Chen (Institute of Genetics and Developmental Biology, Chinese Academy of Sciences), and Professor Junping Gao (Department of Ornamental Horticulture, China Agricultural University) for the generous gift of tobacco BY-2 suspension cells and the transient expression vectors, respectively. This work was supported in part by the China Agriculture Research System (grant No. CARS-32-09) and Guangdong Modern Agricultural Industry Technology System (grant No. LNSG2011-12).
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The authors declare that they have no conflict of interest.
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Communicated by Prakash Lakshmanan.
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Ba, Lj., Shan, W., Xiao, Yy. et al. A ripening-induced transcription factor MaBSD1 interacts with promoters of MaEXP1/2 from banana fruit. Plant Cell Rep 33, 1913–1920 (2014). https://doi.org/10.1007/s00299-014-1668-6
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DOI: https://doi.org/10.1007/s00299-014-1668-6