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Acta Horticulturae Sinica ›› 2025, Vol. 52 ›› Issue (10): 2677-2690.doi: 10.16420/j.issn.0513-353x.2024-0755

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

Screening and Analysis of Phyllostachys edulis PheNAC4 Interacting Proteins by Yeast Two-Hybrid System

XIE Lihua1,2, YAO Pengqiang1, LIU Jiaxue1, WANG Zhe1, ZHU Nannan1, CHENG Shiping1,*(), CHENG Zhanchao2,*()   

  1. 1 Henan Province Key Laboratory of Germplasm Innovation and Utilization of Eco-economic Woody Plant,School of Chemical & Environmental Engineering,Pingdingshan University,Pingdingshan,Henan 467000,China
    2 Key Laboratory of Bamboo and Rattan Science and Technology,National Forestry and Grassland Administration,International Center for Bamboo and Rattan,Beijing 100102,China
  • Received:2025-05-22 Revised:2025-07-09 Online:2025-10-25 Published:2025-10-28
  • Contact: CHENG Shiping, CHENG Zhanchao

Abstract:

Previous experiments have shown that the PheNAC4 gene of Phyllostachys edulis(moso bamboo)is down-regulated after salt stress,and its protein sequence is highly similar to other stress-related NAC genes. Overexpression of the PheNAC4 gene reduces the tolerance of transgenic Arabidopsis thaliana to salt stress. To further investigate its regulatory mechanism,PheNAC4 was used as bait to screen for interacting proteins in this study. The results indicated that PheNAC4 is non-toxic to yeast Y2H Gold cells,although it exhibits self-activation activity in the yeast two-hybrid assay. The self-activation activity of PheNAC4 can be inhibited by adding 1 000 ng · L-1 Aureobasidin A(AbA)inhibitor. In the yeast two-hybrid experiment,36 candidate proteins interacting with PheNAC4 were identified through screening and sequence analysis. These candidate proteins are likely involved in the response of moso bamboo to drought and salt stress,as well as in senescence regulation. To validate these interactions,two stress-related candidate proteins,PheR40C1 and PheF3HL,were selected for further investigation. The yeast two-hybrid assay and bimolecular fluorescence complementation(BiFC)experiments were conducted. These experiments confirmed that PheNAC4 forms heterodimers with PheR40C1 and PheF3HL in both yeast and plant cells. Analysis of the expression patterns of the PheR40C1 and PheF3HL genes after salt stress showed that PheR40C1 was down-regulated in the first 12 hour,exhibiting a similar expression pattern to that of the PheNAC4 gene. In contrast,PheF3HL displayed an opposite expression pattern compared to PheNAC4. These results suggest that PheNAC4 may play a crucial role in the salt stress response of moso bamboo through interactions with PheR40C1 and PheF3HL.

Key words: Phyllostachys edulis, interactive protein, stress, PheNAC4, Yeast two-hybrid system