Differential CaKAN3-CaHSF8 associations underlie distinct immune and heat responses under high temperature and high humidity conditions

Sheng Yang, Weiwei Cai, Ruijie Wu, Yu Huang, Qiaoling Lu, Hui Wang, Xueying Huang, Yapeng Zhang, Qing Wu, Xingge Cheng, Meiyun Wan, Jingang Lv, Qian Liu, Xiang Zheng, Shaoliang Mou, Deyi Guan and Shuilin He ()
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Sheng Yang: Fujian Agriculture and Forestry University
Weiwei Cai: Fujian Agriculture and Forestry University
Ruijie Wu: Fujian Agriculture and Forestry University
Yu Huang: Fujian Agriculture and Forestry University
Qiaoling Lu: Fujian Agriculture and Forestry University
Hui Wang: Fujian Agriculture and Forestry University
Xueying Huang: Fujian Agriculture and Forestry University
Yapeng Zhang: Fujian Agriculture and Forestry University
Qing Wu: Fujian Agriculture and Forestry University
Xingge Cheng: Fujian Agriculture and Forestry University
Meiyun Wan: Fujian Agriculture and Forestry University
Jingang Lv: Fujian Agriculture and Forestry University
Qian Liu: Fujian Agriculture and Forestry University
Xiang Zheng: Fujian Agriculture and Forestry University
Shaoliang Mou: Fujian Agriculture and Forestry University
Deyi Guan: Fujian Agriculture and Forestry University
Shuilin He: Fujian Agriculture and Forestry University

Nature Communications, 2023, vol. 14, issue 1, 1-17

Abstract: Abstract High temperature and high humidity (HTHH) conditions increase plant susceptibility to a variety of diseases, including bacterial wilt in solanaceous plants. Some solanaceous plant cultivars have evolved mechanisms to activate HTHH-specific immunity to cope with bacterial wilt disease. However, the underlying mechanisms remain poorly understood. Here we find that CaKAN3 and CaHSF8 upregulate and physically interact with each other in nuclei under HTHH conditions without inoculation or early after inoculation with R. solanacearum in pepper. Consequently, CaKAN3 and CaHSF8 synergistically confer immunity against R. solanacearum via activating a subset of NLRs which initiates immune signaling upon perception of unidentified pathogen effectors. Intriguingly, when HTHH conditions are prolonged without pathogen attack or the temperature goes higher, CaHSF8 no longer interacts with CaKAN3. Instead, it directly upregulates a subset of HSP genes thus activating thermotolerance. Our findings highlight mechanisms controlling context-specific activation of high-temperature-specific pepper immunity and thermotolerance mediated by differential CaKAN3-CaHSF8 associations.

Date: 2023
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DOI: 10.1038/s41467-023-40251-8

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