Abstract
Xyloglucan endotransglycosylase/hydrolases (XTHs) are believed to modify the cell wall structure by cleaving a xyloglucan polymer and transferring the newly generated, potentially reducing, terminal to another xyloglucan. We report here the detailed analysis of 37 Populus trichocarpa XTH genes/proteins in their divergence in both the coding and 5′ promoter regions. Our results show that the Populus XTH genes have experienced whole-genome and local duplications and pre- and post-speciation divergence. Genome-wide and segmental duplications seem to be dominant in subfamily I and III, while tandem duplication seems to be the major mechanism for the subfamily II expansion, which also has higher average ratios of K a/K s compared to those in subfamily I and III. There was a general lack of organ-specific gene expression. In contrast, the expression patterns in subfamily II varied in response to various hormone treatments, with II-A being up-regulated and II-B down-regulated after 2 h of hormone treatment. Expression for this subfamily was verified using the 1.5-kb PtXTH22 promoter that was fused with the GUS reporter gene and transformed into Arabidopsis. The PtXTH22 promoter contains auxin response element, ethylene insensitive 3-like factors, and brassinosteroid response cis-elements. Histochemical GUS staining of transgenic Arabidopsis seedlings confirmed that the PtXTH22 promoter was up-regulated by several hormones.
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Abbreviations
- XET:
-
Xyloglucan endotransglycosylase
- XEH:
-
Xyloglucan hydrolase
- XTH:
-
Xyloglucan endotransglycosylase/hydrolases
- BA:
-
6-Benzylaminopurine
- IAA:
-
Indole-3-acetic acid
- SA:
-
Salicylic acid
- GA:
-
Gibberellic acid
- BR:
-
Brassinosteroid
- JA:
-
Jasmonic acid
- ABA:
-
Abscisic acid
- GUS:
-
β-Glucuronidase
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Acknowledgments
This research was supported in part by a Department of Energy-Bioenergy Center grant and by the Consortium for Plant Biotechnology Research, Inc. The BioEnergy Science Center is a US Department of Energy–Bioenergy Research Center supported by the Office of Biological and Environmental Research in the Department of Energy Office of Science.
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ESM 1
The Ct data for each reaction of the XTH genes in Populus (DOC 1625 kb)
ESM 2
The efficiency for each pair primers of the XTH genes in Populus (DOC 41 kb)
ESM 3
The promoter sequences of paralogous genes (DOC 38 kb)
ESM 4
The gene models of the PtXTH genes (DOC 51 kb)
ESM 5
The gene structure analysis of the PtXTH genes (DOC 47 kb)
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Ye, X., Yuan, S., Guo, H. et al. Evolution and divergence in the coding and promoter regions of the Populus gene family encoding xyloglucan endotransglycosylase/hydrolases. Tree Genetics & Genomes 8, 177–194 (2012). https://doi.org/10.1007/s11295-011-0431-1
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DOI: https://doi.org/10.1007/s11295-011-0431-1