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Open AccessArticle

Genome-Wide Identification and Characterization of Heat-Shock Transcription Factors in Rubber Tree

by Yan Li 1,2,3, Wencai Yu 4, Yueyi Chen 2,3, Shuguang Yang 2,3, Shaohua Wu 2,3, Jinquan Chao 2,3, Xinlong Wang 2,3 and Wei-Min Tian 2,3,*
1
College of Tropical Crops, Hainan University, Haikou 570228, China
2
Ministry of Agriculture Key Laboratory of Biology and Genetic Resources of Rubber Tree, Rubber Research Institute, Chinese Academy of Tropical Agricultural Sciences, Haikou 571101, China
3
State Key Laboratory Breeding Base of Cultivation and Physiology for Tropical Crops, Rubber Research Institute, Chinese Academy of Tropical Agricultural Sciences, Haikou 571101, China
4
Yunnan Institute of Tropical Crops, Jinghong 666100, China
*
Author to whom correspondence should be addressed.
Forests 2019, 10(12), 1157; https://doi.org/10.3390/f10121157
Received: 2 November 2019 / Revised: 2 December 2019 / Accepted: 10 December 2019 / Published: 17 December 2019
(This article belongs to the Section Forest Ecophysiology and Biology)
Heat-shock transcription factors (Hsfs) play a pivotal role in the response of plants to various stresses. The present study aimed to characterize the Hsf genes in the rubber tree, a primary global source of natural rubber. In this study, 30 Hsf genes were identified in the rubber tree using genome-wide analysis. They possessed a structurally conserved DNA-binding domain and an oligomerization domain. On the basis of the length of the insert region between HR-A and HR-B in the oligomerization domain, the 30 members were clustered into three classes, Classes A (18), B (10), and C (2). Members within the same class shared highly conserved gene structures and protein motifs. The background expression levels of 11 genes in cold-tolerant rubber-tree clone 93-14 were significantly higher than those in cold-sensitive rubber-tree clone Reken501, while four genes exhibited inverse expression patterns. Upon cold stress, 20 genes were significantly upregulated in 93-114. Of the upregulated genes, HbHsfA2b, HbHsfA3a, and HbHsfA7a were also significantly upregulated in three other cold-tolerant rubber-tree clones at one or more time intervals upon cold stress. Their nuclear localization was verified, and the protein–protein interaction network was predicted. This study provides a basis for dissecting Hsf function in the enhanced cold tolerance of the rubber tree. View Full-Text
Keywords: Hevea brasiliensis Muell. Arg.; heat-shock transcription factor; cold stress; cold-sensitive rubber-tree clones; cold-tolerant rubber-tree clones Hevea brasiliensis Muell. Arg.; heat-shock transcription factor; cold stress; cold-sensitive rubber-tree clones; cold-tolerant rubber-tree clones
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Li, Y.; Yu, W.; Chen, Y.; Yang, S.; Wu, S.; Chao, J.; Wang, X.; Tian, W.-M. Genome-Wide Identification and Characterization of Heat-Shock Transcription Factors in Rubber Tree. Forests 2019, 10, 1157.

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