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Acta Horticulturae Sinica ›› 2026, Vol. 53 ›› Issue (1): 131-148.doi: 10.16420/j.issn.0513-353x.2024-0952

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

Whole-Genome Identification of the CNGC Gene Family in Cymbidium ensifolium and Transcriptional Reponses Under Abiotic Stresses

ZHU Xuanyi1, ZHAO Yuqing1, TANG Feihong1, WU Haiyan1, ZHANG Chun3, ZHAO Kai2, PENG Donghui1, LAN Siren1, ZHOU Yuzhen1,*()   

  1. 1 The Strait Floral Industry Science and Technology Innovation HubKey Laboratory of National Forestry and Grassland Administration for Orchid Conservation and Utilization,College of Landscape Architecture and Art,Fujian Agriculture and Forestry University, Fuzhou 350002, China
    2 College of Life SciencesFujian Normal University, Fuzhou 350117, China
    3 The Forestry Science and Technology Extension StationZhangzhou, Fujian 363000, China
  • Received:2025-03-13 Revised:2025-09-02 Online:2026-01-25 Published:2026-01-26
  • Contact: ZHOU Yuzhen

Abstract:

To further investigate the functional roles of the Cymbidium ensifolium CNGC gene family,a systematic identification and in-depth analysis were conducted utilizing whole-genome data. A total of 13 CeCNGC genes containing CNBD,CaMBD,and IQ motifs were identified,which were classified into five subfamilies. These genes were unevenly distributed across 10 chromosomes,with two pairs of segmental duplications detected. The promoter regions of these genes harbor a large number of cis-acting elements closely associated with hormone responses and abiotic stress regulation. Additionally,their regulatory sequences harbor multiple miRNA binding sites related to abiotic stress responses. Expression analysis revealed that CeCNGC genes were transcribed across different tissues and floral developmental stages,with CeCNGC3/5/10/11/12/13 exhibiting significant tissue-specific transcription patterns. Under drought,low-temperature,and ABA treatments,all CeCNGC genes responded to varying degrees. During drought stress,CeCNGC1/4/5/8/13/10/12/9/11 were up-regulated on the third day,among which CeCNGC1/4/13 exhibited the most significant up-regulation. In contrast,CeCNGC2/3/6/7 were significantly down-regulated on the second day. Under low-temperature stress,the expression levels of CeCNGC2/4/5/7 continuously increased from day 3 to 7. In response to ABA treatment,the expression levels of CeCNGC9/10/12/13 were significantly up-regulated on the first day,whereas CeCNGC1/4/7 were significantly up-regulated on the third day. Notably,CeCNGC2 exhibited a consistent expression pattern under both low-temperature and ABA treatments,with strong induction observed in both conditions.

Key words: Cymbidium ensifolium, CNGC genes, expression patterns, abiotic stress