Acta Agriculturae Zhejiangensis ›› 2025, Vol. 37 ›› Issue (2): 311-320.DOI: 10.3969/j.issn.1004-1524.20240346

• Horticultural Science • Previous Articles     Next Articles

Analysis on the effects of CPPU and TDZ on the aroma of Tiangong Moyu grape using WGCNA and the exploration of the key genes

ZHENG Ting(), XIANG Jiang, WEI Lingzhu, WU Jiang, CHENG Jianhui()   

  1. Institute of Horticulture, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, China
  • Received:2024-04-13 Online:2025-02-25 Published:2025-03-20
  • Contact: CHENG Jianhui

Abstract:

In order to study the effect of treatment agents on the aroma of seedless grapes, the early-maturing seedless grape variety Tiangong Moyu was used as the experimental material, and the inflorescence of Tiangong Moyu was treated with forchlorfenuron (CPPU) and thidiazuron (TDZ) combined with gibberellin (GA3). The aroma components in mature grape fruits were determined, and the expression levels of terpenoid metabolism-related genes in fruit development stage were detected. Combined with transcriptome data, the terpenoid components were analyzed by the weighted gene co-expression network analysis (WGCNA), and the genes related to grape aroma formation were screened. The results showed that a total of 35 components were detected in the mature Tiangong Moyu grape fruits, including 13 terpenoids. After CPPU and TDZ treatment, the content of characteristic aroma substances, namely, nerol, geraniol and linalool decreased significantly (P<0.05). The expression of HMGR(HMGR1 and HMGR3), the rate-limiting enzyme gene of terpenoid synthesis mevalonate pathway (MVA), decreased after treatment. The methylerythritol phosphate pathway (MEP) rate-limiting enzyme gene DXR showed a downward-upward trend after CPPU treatment, while it was the opposite in TDZ. WGCNA results showed that linalool, nerol and geraniol were clustered together, which were highly correlated with the turquoise module. The MYB44 gene was significantly down-regulated after treatment, especially after TDZ treatment, which was consistent with the content changes of the three substances. The results provide a theoretical basis for the application of CPPU and TDZ in grape fruit production.

Key words: grape, aroma, forchlorfenuron (CPPU), thidiazuron (TDZ), weighted gene co-expression network analysis (WGCNA)

CLC Number: