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@article {1265,
	title = {Hsf and Hsp gene families in Populus: genome-wide identification, organization and correlated expression during development and in stress responses.},
	journal = {BMC genomics},
	volume = {16},
	year = {2015},
	month = {2015},
	pages = {181},
	abstract = {BACKGROUND: Heat shock proteins (Hsps) are molecular chaperones that are involved in many normal cellular processes and stress responses, and heat shock factors (Hsfs) are the transcriptional activators of Hsps. Hsfs and Hsps are widely coordinated in various biological processes. Although the roles of Hsfs and Hsps in stress responses have been well characterized in Arabidopsis, their roles in perennial woody species undergoing various environmental stresses remain unclear.

RESULTS: Here, a comprehensive identification and analysis of Hsf and Hsp families in poplars is presented. In Populus trichocarpa, we identified 42 paralogous pairs, 66.7\% resulting from a whole genome duplication. The gene structure and motif composition are relatively conserved in each subfamily. Microarray and quantitative real-time RT-PCR analyses showed that most of the Populus Hsf and Hsp genes are differentially expressed upon exposure to various stresses. A coexpression network between Populus Hsf and Hsp genes was generated based on their expression. Coordinated relationships were validated by transient overexpression and subsequent qPCR analyses.

CONCLUSIONS: The comprehensive analysis indicates that different sets of PtHsps are downstream of particular PtHsfs and provides a basis for functional studies aimed at revealing the roles of these families in poplar development and stress responses.},
	issn = {1471-2164},
	doi = {10.1186/s12864-015-1398-3},
	author = {Zhang, Jin and Liu, Bobin and Li, Jianbo and Zhang, Li and Wang, Yan and Zheng, Huanquan and Lu, Mengzhu and Chen, Jun}
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