Biotechnology Bulletin ›› 2025, Vol. 41 ›› Issue (4): 278-288.doi: 10.13560/j.cnki.biotech.bull.1985.2024-0744

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Function Study of NtMYC2 Gene on Tobacco Trichome Development

JI Ying-tong(), GAO Jia-ning, QIAN Meng-ying, PAN Ning, ZHANG Jun, CUI Hong, YAN Xiao-xiao()   

  1. College of Tobacco Science, Henan Agricultural University, Zhengzhou 450046
  • Received:2024-08-02 Online:2025-04-26 Published:2025-04-25
  • Contact: YAN Xiao-xiao E-mail:13596329880@163.com;xiaoxyan@henau.edu.cn

Abstract:

Objective The regulatory mechanism of NtMYC2 transcription factor in JA-mediated on tobacco trichomes density improvement was studied. Method NtMYC2 gene was cloned from Nicotiana tabacum L. by homologous cloning method. Bioinformatics analysis and subcellular localization were performed to analyze NtMYC2 genetic characterization. Fluorescence quantitative PCR technology was used to detect its expressions files in different tissues and responses to different concentrations of MeJA treatment. NtMYC2 knockout materials were created to verify the function of regulating glandular trichomes. The yeast two-hybrid system was adopted to clarify the protein interaction between NtMYC2 and NtJAZ11. Result NtMYC2 had two homologous sequences, NtMYC2a and NtMYC2b, with open reading frame lengths of 2 040 and 2 046 bp, and coding protein lengths of 679 and 681 amino acids. The homology evolution analysis found that NtMYC2a was highly homologous to Nicotiana tomentosiformis and NtMYC2b was highly homologous to Nicotiana sylvestris, respectively. Both of them had the close relationship with homologous genes from Solanum lycopersicum, Solanum tuberosum and Capsicum annuum, but the distant relationship from Artemisia annua and Arabidopsis thaliana. The protein sequence alignment found that NtMYC2 had JID, TAD and bHLH domains and belonged to the bHLH gene family. Expression analysis clarified that both NtMYC2a and NtMYC2b had the highest expressions in leaves and the lowest expression levels in roots. Both of them were strongly induced by MeJA. NtMYC2 fusion protein was localized in the nucleus. Moreover, long and short glandular trichomes density ofthe leaf surface of NtMYC2 gene knockout lines decreased significantly, non-secretory trichomes disappeared. Yeast two-hybrid results verified that both NtMYC2a and NtMYC2b interacted with NtJAZ11. Conclusion NtMYC2 is involved in the regulation of JA-mediated tobacco trichomes development with protein interacting with NtJAZ11.

Key words: tobacco, NtMYC2, jasmonic acid, trichomes density, NtJAZ11