Ethylene negatively regulates cold tolerance through HbEIN3-HbICE2 regulatory module in Hevea brasiliensis

文献类型： 外文期刊

第一作者： Zeng, Xue-Wei

作者： Zeng, Xue-Wei;Jiang, Wei-Zeng;Zhang, Jian-Long;Ding, Jia-Hui;Qiu, Yi-Min;Wen, Wei;Yang, Huan;Zhang, Qian-Yu;Yuan, Hong-Mei;Zeng, Xue-Wei

作者机构：

期刊名称：PLANT PHYSIOLOGY AND BIOCHEMISTRY （ 影响因子：5.7； 五年影响因子：6.4 ）

ISSN： 0981-9428

年卷期： 2025 年 219 卷

页码：

收录情况： SCI

摘要： Cold stress can result in reduced growth rates, decreased latex production, and restricted areas for the Para rubber tree ( Hevea brasiliensis). However, the molecular mechanisms governing the response of Hevea brasiliensis to cold stress remain elusive. Here, we found that ethylene plays a negative role in Hevea brasiliensis responses to cold stress. Treatment with the ethylene synthesis precursor 1-aminocyclopropane-1-carboxylic acid (ACC) decreased the cold tolerance of Hevea brasilien sis, while exogenous treatment with Ag+ (an ethylene signal inhibitor) had the opposite effect. Additionally, overexpressing HbE IN3 decreased cold stress tolerance in Arabidopsis and Taraxacum koksaghyz plants. Quantitative real-time PCR analysis indicated that HbEIN3-1 and HbEIN3-2 repress the expression of the cold-responsive genes HbCBF1-3 in Hevea brasiliensis. Moreover, HbEIN3-1 and HbEIN3-2 directly bind to the HbC BF1 promoter to suppress its transcription. Further investigation revealed that HbEIN3s interact with and dampen the transcriptional activity of HbICE2, a crucial transcription factor that positively regulates the cold signaling pathway, thereby attenuating the expression of HbICE2-targeted genes. Collectively, these findings indicate that HbEIN3s play a crucial role in ethylene- regulated cold tolerance through the repression of HbC BF1 expression and HbICE2 transcriptional activity.

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