Abstract
Key message
Cassava MeCBF1 is a typical CBF transcription factor mediating cold responses but its low expression in apical buds along with a retarded response cause inefficient upregulation of downstream cold-related genes, rendering cassava chilling-sensitive.
Abstract
Low temperature is a major abiotic stress factor affecting survival, productivity and geographic distribution of important crops worldwide. The C-repeat/dehydration-responsive element binding transcription factors (CBF/DREB) are important regulators of abiotic stress response in plants. In this study, MeCBF1, a CBF-like gene, was identified in the tropical root crop cassava (Manihot esculenta Crantz). The MeCBF1 encodes a protein that shares strong homology with DREB1As/CBFs from Arabidopsis as well as other species. The MeCBF1 was localized to the nucleus and is mainly expressed in stem and mature leaves, but not in apical buds or stem cambium. MeCBF1 expression was not only highly responsive to cold, but also significantly induced by salt, PEG and ABA treatment. Several stress-associated cis-elements were found in its promoter region, e.g., ABRE-related, MYC recognition sites, and MYB responsive element. Compared with AtCBF1, the MeCBF1 expression induced by cold in cassava was retarded and upregulated only after 4 h, which was also confirmed by its promoter activity. Overexpression of MeCBF1 in transgenic Arabidopsis and cassava plants conferred enhanced crytolerance. The CBF regulon was smaller and not entirely co-regulated with MeCBF1 expression in overexpressed cassava. The retarded MeCBF1 expression in response to cold and attenuated CBF-regulon might lead cassava to chilling sensitivity.
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Acknowledgements
This research was supported by grants from the National Key Technology R&D Program of China (No. 2015BAD15B01), the National Natural Science Foundation of China (Nos. 31271775; 31571729), and the Earmarked Fund for China Agriculture Research System (No. CARS-12-shzp).
Author contributions
DA performed most of the experiments and drafted the manuscript. QM produced transgenic cassava. HW and JY conducted part of gene and promoter analysis. WZ conducted part of field experiments. PZ coordinated and designed the study and revised most of the article.
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The nucleotide sequences of MeCBF1 and MeCBF2 and their promoters reported in this paper have been deposited in Genbank under accession numbers JN615573, JN615574, JN615575 and JN615576, respectively.
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An, D., Ma, Q., Wang, H. et al. Cassava C-repeat binding factor 1 gene responds to low temperature and enhances cold tolerance when overexpressed in Arabidopsis and cassava. Plant Mol Biol 94, 109–124 (2017). https://doi.org/10.1007/s11103-017-0596-6
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DOI: https://doi.org/10.1007/s11103-017-0596-6