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  3. Exo84c-regulated degradation is involved in the normal self-incompatible response in Brassicaceae

Exo84c-regulated degradation is involved in the normal self-incompatible response in Brassicaceae

  • Cell Rep. 2024 Mar 4;43(3):113913. doi: 10.1016/j.celrep.2024.113913.
Tong Zhang 1,  Kun Wang 2,  Shengwei Dou 3,  Erlin Gao 4,  Patrick J Hussey 5,  Zongcheng Lin 4,  Pengwei Wang 6
Affiliations

Affiliations

  • 1 National Key Laboratory for Germplasm Innovation & Utilization of Horticultural Crops, College of Horticulture and Forestry Sciences, Huazhong Agricultural University, Wuhan 430070, China; College of Horticulture Science and Engineering, Shandong Agricultural University, Tai'an 271018, China; Hubei Hongshan Laboratory, Wuhan 430070, China.
  • 2 National Key Laboratory for Germplasm Innovation & Utilization of Horticultural Crops, College of Horticulture and Forestry Sciences, Huazhong Agricultural University, Wuhan 430070, China; College of Life Science and Technology, Huazhong Agricultural University, Wuhan 430070, China; Hubei Hongshan Laboratory, Wuhan 430070, China.
  • 3 College of Horticulture Science and Engineering, Shandong Agricultural University, Tai'an 271018, China; Hubei Hongshan Laboratory, Wuhan 430070, China; National Key Laboratory of Crop Genetic Improvement, Huazhong Agricultural University, Wuhan 430070, China.
  • 4 National Key Laboratory for Germplasm Innovation & Utilization of Horticultural Crops, College of Horticulture and Forestry Sciences, Huazhong Agricultural University, Wuhan 430070, China; Hubei Hongshan Laboratory, Wuhan 430070, China.
  • 5 Department of Biosciences, Durham University, South Road, DH1 3LE Durham, UK.
  • 6 National Key Laboratory for Germplasm Innovation & Utilization of Horticultural Crops, College of Horticulture and Forestry Sciences, Huazhong Agricultural University, Wuhan 430070, China; College of Life Science and Technology, Huazhong Agricultural University, Wuhan 430070, China; Hubei Hongshan Laboratory, Wuhan 430070, China. Electronic address: wangpengwei@mail.hzau.edu.cn.
PMID: 38442016 DOI: 10.1016/j.celrep.2024.113913
Abstract

The self-incompatibility system evolves in angiosperms to promote cross-pollination by rejecting self-pollination. Here, we show the involvement of Exo84c in the SI response of both Brassica napus and Arabidopsis. The expression of Exo84c is specifically elevated in stigma during the SI response. Knocking out Exo84c in B. napus and SI Arabidopsis partially breaks down the SI response. The SI response inhibits both the protein secretion in papillae and the recruitment of the exocyst complex to the pollen-pistil contact sites. Interestingly, these processes can be partially restored in exo84c SI Arabidopsis. After incompatible pollination, the turnover of the exocyst-labeled compartment is enhanced in papillae. However, this process is perturbed in exo84c SI Arabidopsis. Taken together, our results suggest that Exo84c regulates the exocyst complex vacuolar degradation during the SI response. This process is likely independent of the known SI pathway in Brassicaceae to secure the SI response.

Keywords

Brassicaceae; CP: Cell biology; CP: Plants; autophagy; degradation; exocyst complex; live cell imaging; secretion; self-incompatibility.

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