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Acta Horticulturae Sinica ›› 2024, Vol. 51 ›› Issue (11): 2523-2539.doi: 10.16420/j.issn.0513-353x.2023-0469

• Genetic & Breeding·Germplasm Resources·Molecular Biology • Previous Articles     Next Articles

Functional Study of AP2/ERF in Response to Black Rot at Broccoli Seedling Stage

TANG Zheng*(), CHEN Sique, XU Qian, ZHONG Weijie, LIU Qing, ZHU Shiyang   

  1. Key Laboratory of Crop Breeding in South Zhejiang,Key Laboratory of Wenzhou Endemic Crop Biotechnology Innovation,Wenzhou Vocational College of Science & Technology/Wenzhou Academy of Agricultural Sciences,Wenzhou,Zhejiang 325006,China
  • Received:2024-06-27 Revised:2024-08-20 Online:2024-12-12 Published:2024-11-25
  • Contact: TANG Zheng

Abstract:

To explore the response mechanism of black rot and identify disease-resistance related genes through RNA-Seq analysis of broccoli(Brassica oleracea L. var. italica)leaves infected by black rot pathogen. Gene Ontology(GO)analysis showed that up-regulated differentially expressed genes(DEGs)were significantly enriched in stress response and phytohormone signaling pathways after 3,5,and 7 days infected by pathogens compared to uninoculated. At these three time points,the up-regulated genes in overlapped DEGs encoded up to 32 AP2/ERF transcription factors. Their encoded protein sequence ranged from 132 to 344 amino acids in length,and its promoter contained a large number of cis-elements in response to abscisic acid,auxin,jasmonic acid,gibberellin and salicylic acid(SA). SA treatment significantly enhanced the resistance of broccoli to black rot,and strongly induced the expression of AP2/ERF and defense-related genes. BolC1t04894H encodes an EAR type transcriptional suppressor ERF4,which is localized in the nucleus. Transient expression of broccoli ERF4 resulted in sensitivity of tobacco leaves to Xcc treatment. Electrophoretic Mobility Shift Assay(EMSA)result indicated that ERF4 could bind the GCC-box sequence in the promoter of WRKY33. Subsequently,double luciferase reporter system experiments showed that ERF4 inhibited WRKY33 expression. Taken together,the phytohormone signalling pathway are activated in broccoli after black rot pathogen infection,and SA strongly induces the AP2/ERF expression,thereby regulating a series of defense-related genes transcription to response black rot.

Key words: broccoli, AP2/ERF transcription factor, black rot, salicylic acid, disease resistance