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Acta Horticulturae Sinica ›› 2025, Vol. 52 ›› Issue (7): 1789-1802.doi: 10.16420/j.issn.0513-353x.2024-0791

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

The Functional Analysis of RcTCP9 Gene in Response to Salt and Drought Stress in Rosa chinensis‘Yueyuehong’

DONG Xuanke1,2, LI Yingyang1,2, MA Yuwan1,2, CAI Yanfang1, DING Qihan1,2, CHEN Haixia1,2, LI Yufan1,2,*(), and CHEN Jiren1,2,*()   

  1. 1 College of Horticulture,Hunan Agricultural University,Changsha 410128,China
    2 Hunan Mid-subtropical Quality Plant Breeding and Utilization Engineering Technology Research Center,Changsha 410128,China
  • Received:2025-05-20 Revised:2025-05-07 Online:2025-07-23 Published:2025-07-23
  • Contact: LI Yufan, and CHEN Jiren

Abstract:

Using cuttings of Rosa chinensis‘Yueyuehong’as materials,the expression patterns were analyzed of the RcTCP9 gene under varying durations of salt and drought stress. Results indicated that the expression of RcTCP9 was significantly upregulated under both stress conditions,demonstrating its active response. The gene was transiently expressed in tobacco,and observations of green fluorescence signals revealed that the encoded protein localized to the nucleus. Using Virus-Induced Gene Silencing(VIGS)and transient overexpression experiments,silencing RcTCP9 led to physiological damage in plants under salt and drought stress,characterized by wilting of leaves and roots,increased ion permeability,and elevated malondialdehyde(MDA)levels,while the activities of catalase(CAT)and peroxidase(POD)decreased. Overexpressed rose petals exhibited reduced cellular membrane damage,lower fading rates,and decreased MDA levels,showing improved resistance. The expression levels of stress tolerance related genes in overexpressed plants under salt and drought stress were determined,and the results showed that the expression of RcTCP9 may enhance plant stress tolerance by regulating the RcPR4-1 and RcNAC091 related pathways. In summary,the RcTCP9 gene plays a significant role in enhancing the tolerance of roses to salt and drought stress.

Key words: rosa, RcTCP9, salt tolerance, drought tolerance, antioxidant