Comparative transcriptomic analysis reveals the roles of overlapping heat-/drought-responsive genes in poplars exposed to high temperature and drought

High temperature (HT) and drought are both critical factors that constrain tree growth and survival under global climate change, but it is surprising that the transcriptomic reprogramming and physiological relays involved in the response to HT and/or drought remain unknown in woody plants. Thus, Pop...

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Published inScientific reports Vol. 7; no. 1; p. 43215
Main Authors Jia, Jingbo, Zhou, Jing, Shi, Wenguang, Cao, Xu, Luo, Jie, Polle, Andrea, Luo, Zhi-Bin
Format Journal Article
LanguageEnglish
Published England Nature Publishing Group 24.02.2017
Subjects
Abscisic acid
Climate change
Desiccation
Heat
High temperature
Leaves
Metabolism
Physiology
Ribonucleic acid
RNA
RNA transport
Roots
Temperature effects
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Summary:High temperature (HT) and drought are both critical factors that constrain tree growth and survival under global climate change, but it is surprising that the transcriptomic reprogramming and physiological relays involved in the response to HT and/or drought remain unknown in woody plants. Thus, Populus simonii saplings were exposed to either ambient temperature or HT combined with sufficient watering or drought. RNA-sequencing analysis showed that a large number of genes were differentially expressed in poplar roots and leaves in response to HT and/or desiccation, but only a small number of these genes were identified as overlapping heat-/drought-responsive genes that are mainly involved in RNA regulation, transport, hormone metabolism, and stress. Furthermore, the overlapping heat-/drought-responsive genes were co-expressed and formed hierarchical genetic regulatory networks under each condition compared. HT-/drought-induced transcriptomic reprogramming is linked to physiological relays in poplar roots and leaves. For instance, HT- and/or drought-induced abscisic acid accumulation and decreases in auxin and other phytohormones corresponded well with the differential expression of a few genes involved in hormone metabolism. These results suggest that overlapping heat-/drought-responsive genes will play key roles in the transcriptional and physiological reconfiguration of poplars to HT and/or drought under future climatic scenarios.
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These authors contributed equally to this work.
ISSN:2045-2322
2045-2322
DOI:10.1038/srep43215