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The ICE-like transcription factor HbICE2 is involved in jasmonate-regulated cold tolerance in the rubber tree (Hevea brasiliensis)

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An ICE-like transcription factor mediates jasmonate-regulated cold tolerance in the rubber tree (Hevea brasiliensis), and confers cold tolerance in transgenic Arabidopsis.

Abstract

The rubber tree (Hevea brasiliensis) is susceptible to low temperatures, and understanding the mechanisms regulating cold stress is of great potential value for enhancing tolerance to this environmental variable. In this study, we find that treatment with exogenous methyl jasmonate (MeJA) could significantly enhance Hevea brasiliensis cold tolerance. In addition, yeast two-hybrid and bimolecular fluorescence complementation (BiFC) experiments show that JASMONATE ZIM-DOMAIN(JAZ) proteins, HbJAZ1 and HbJAZ12, key repressors of JA signaling pathway, interact with HbICE2, a novel ICE (Inducer of CBF Expression)-like protein. HbICE2 was nuclear-localised and bound to the MYC recognition (MYCR) sequence. The transcriptional activation activity of HbICE2 in yeast cells was dependent on the N-terminus, and overexpression of HbICE2 in Arabidopsis resulted in elevated tolerance to chilling stress. Furthermore, dual-luciferase transient assay reveals that HbJAZ1 and HbJAZ12 proteins inhibit the transcriptional function of HbICE2. The expression of C-repeat-binding factor (CBF) signalling pathway genes including HbCBF1, HbCBF2 and HbCOR47 were up-regulated by MeJA. Taken together, our data suggest that the new ICE-like transcription factor HbICE2 is involved in jasmonate-regulated cold tolerance in Hevea brasiliensis.

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Abbreviations

ABA:

Abscisic acid

ARRs:

Cold-regulated type-A response regulators

BiFC:

Bimolecular fluorescence complementation

CBF:

C-repeat-binding factor

CBF/DREB1:

INDUCER OF CBF EXPRESSION (ICE)-C-REPEAT BINDING FACTOR/DRE BINDING FACTOR1

COI1:

CORONATINE INSENSITIVE1

EIN3:

ETHYLENE INSENSITIVE 3

HOS1:

RING E3 ligase high expression of osmotically responsive gene 1

ICE:

Inducer of CBF Expression

JA:

Jasmonate

JAZ:

JASMONATE ZIM-DOMAIN

MAPK:

Mitogen-activated protein kinases

MDA:

malondialdehyde

MeJA:

methyl jasmonate

MYCR:

MYC recognition

OST1:

Open stomata1

SIZ1:

SAP and Miz1

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Funding

This work was supported by the National Natural Science Foundation of China [#31872045 and #31560197], and Youth Foundation of Hainan University [# hdkyxj201703].

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Correspondence to Hong-Mei Yuan.

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The authors declare that they have no conflict of interest.

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Communicated by Ying-Tang Lu.

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Chen, WJ., Wang, X., Yan, S. et al. The ICE-like transcription factor HbICE2 is involved in jasmonate-regulated cold tolerance in the rubber tree (Hevea brasiliensis). Plant Cell Rep 38, 699–714 (2019). https://doi.org/10.1007/s00299-019-02398-x

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  • DOI: https://doi.org/10.1007/s00299-019-02398-x

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