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Acta Horticulturae Sinica ›› 2026, Vol. 53 ›› Issue (4): 1202-1214.doi: 10.16420/j.issn.0513-353x.2025-0057

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

Effects of Ethylene Signal Treansduction Factor CmEIL01 Gene on Volatile Biosynthesis of Melon Fruit

GUO Xinqi, CHEN Qiang, ZHANG Ying, ZHANG Chong*()   

  1. College of Life Science,Shenyang Normal University,Shenyang 110000,China
  • Received:2025-12-04 Revised:2026-02-12 Online:2026-04-25 Published:2026-04-20
  • Contact: ZHANG Chong

Abstract:

EIN3-like(EIL)proteins are crucial nuclear transcription factors in the ethylene signaling pathway,initiating a series of transcriptional cascades that regulate the expression of ethylene target genes. Using GST pull-down combined with liquid chromatography-tandem mass spectrometry(LC-MS/MS)technology,proteins interacting with CmEIL01 were screened in mature melon fruits,and the interaction between CmEIL01 and candidate proteins was further validated. To elucidate the regulatory function of the ethylene signaling factor gene CmEIL01 in the biosynthesis of aroma compounds in oriental melon,nine proteins potentially interacting with CmEIL01 were identified,among which the key gene for fruit ester synthesis,CmAAT1,had the highest predicted confidence value. Yeast two-hybrid(Y2H)and Pull-down analyses also confirmed the interaction between CmEIL01 and CmAAT1 proteins in vitro. Tobacco dual-luciferase reporter assays showed that CmEIL01 significantly activated the promoter activity of the CmAAT1 gene. Transient expression in oriental melon melon fruits revealed that the expression level of CmEIL01 peaked on the sixth day after injection,significantly increasing the expression levels of the homologous gene CmEIL02 and CmAAT1,leading to a notable rise in ethyl acetate content and the contents of hexyl acetate and hexanol were also significantly higher than those in the non-injected fruits. The results suggest that CmEIL01 may participate in the synthesis of aromatic compounds in oriental melon fruits by regulating the expression of the key gene CmAAT1 involved in straight-chain ester synthesis.

Key words: melon, ethylene signal transduction, fruit ripening, CmEIL01, GST pull-down, transient overexpression, volatile synthesis