Abstract
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Three TaLTPs were found to enhance chilling tolerance of transgenic Arabidopsis, which were characterized by analyzes of promoter-GUS activity, subcellular localization, chromosomal location and transcriptional profile.
Abstract
Non-specific lipid transfer proteins (nsLTP) are abundantly expressed in plants, however, their functions are still unclear. In this study, we primarily characterized the functions of 3 type I TaLTP genes that were localized on chromosomes 3A, 3B, and 5D, respectively. The transcripts of TaLTPIb.1 and TaLTPIb.5 were induced under chilling, wound, and drought conditions, while TaLTPId.1 was only up-regulated by dark treatment. All the 3 TaLTP genes could be stimulated by the in vitro treatment of salicylic acid, while TaLTPId.1 was also positively regulated by methyljasmonic acid. Furthermore, the promoter-reporter assay of TaLTPIb.1 in the transgenic brachypodium showed a typical epidermis-specific expression pattern of this gene cluster. When fused with EGFP, all the 3 proteins were shown to localize on the plasma membrane in transgenic tobacco, although a signal in chloroplasts was also observed for TaLTPId.1. Heterogeneous overexpression of each of the TaLTP genes in Arabidopsis resulted in longer root length compared with wild type plants under chilling condition. These results suggest that type I TaLTPs may have a conserved functionality in chilling tolerance by lipid permeation in the plasma membrane of epidermal cells. On the other hand, the type I TaLTPs may exert functional divergence mainly through regulatory subfunctionalization.
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This work was financially supported by National Natural Science Foundation of China (No. 31200982), 973 Developmental Program (2014CB138100), and Shandong province programs (20133702120002 and BS2013NY006).
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We declare that we have no financial and personal relationships with other people or organizations that can inappropriately influence our work, there is no professional or other personal interest of any nature or kind in any product, service and/or company that could be construed as influencing the position presented in, or the review of, the manuscript entitled.
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Communicated by Baochun Li.
G. Yu and W. Hou contributed equally to this work.
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Yu, G., Hou, W., Du, X. et al. Identification of wheat non-specific lipid transfer proteins involved in chilling tolerance. Plant Cell Rep 33, 1757–1766 (2014). https://doi.org/10.1007/s00299-014-1655-y
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DOI: https://doi.org/10.1007/s00299-014-1655-y