Biotechnology Bulletin ›› 2025, Vol. 41 ›› Issue (8): 220-233.doi: 10.13560/j.cnki.biotech.bull.1985.2025-0057

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Identification of Plasma Membrane H+-ATPase Gene Family in Safflower and Expression Analysis in Response to Low Nitrogen and Low Phosphorus Stress

LA Gui-xiao1,2(), ZHAO Yu-long1,2, DAI Dan-dan1,2, YU Yong-liang1,2, GUO Hong-xia1,2, SHI Gui-xia1,2, JIA Hui1, YANG Tie-gang1,2()   

  1. 1.Institute of Chinese Herbal Medicines, Henan Academy of Agricultural Sciences, Zhengzhou 450002
    2.Provincial Key Laboratory of Conservation and Utilization of Traditional Chinese Medicine Resources, Institute of Chinese Herbal Medicines, Henan Academy of Agricultural Sciences, Zhengzhou 450002
  • Received:2025-01-14 Online:2025-08-26 Published:2025-08-14
  • Contact: YANG Tie-gang E-mail:zju-l@163.com;ytgha@163.com

Abstract:

Objective Genome-wide identification and analysis of the plasma membrane H+-ATPase (PMA) gene family in safflower (Carthamus tinctorius L.) may provide the basis for investigating this gene family and its function in response to low nitrogen and low phosphorus stress. Method Bioinformatics was used to identify and systematically analyze the members of the CtPMA gene family. Real-time fluorescence quantitative PCR (RT-qPCR) was applied to analyze the tissue-specific expression pattens and the responses to low nitrogen and low phosphorus stress. Result A total of 10 CtPMAs (named CtPMA1-CtPMA10) were identified in safflower, encoding proteins ranging from 785 to 958 aa, with relative molecular weight of 85.23 to 105.52 kD, and isoelectric points of 5.26 to 7.91. All were predicted to be localized to the plasma membrane by the subcellular localization. All members contained conserved domains, including the Cation_ATPase_N domain, the E1_E2 ATPase domain, and the HAD-superfamily hydrolase subfamily ⅢA domain. Cis-acting element analysis revealed a lot of regulatory elements related to growth, development, hormones and stress responses. Gene collinearity indicated that whole-genome duplication and segmental duplication played key roles in the evolution of the CtPMA gene family. RT-qPCR results showed that the CtPMA1 and CtPMA7, which were highly expressed in the roots, were significantly induced by low nitrogen and low phosphorus stress. This finding suggests that CtPMA1 and CtPMA7 may play a crucial role in the process of nitrogen and phosphorus uptake in safflower roots. Conclusion A total of 10 CtPMAs members are identified in the safflower genome.These members demonstrate evolutionary conservation and tissue-specific expression patterns. The highly expressed CtPMA1 and CtPMA7 transcripts in the roots were significantly induced under low nitrogen and phosphorus stress. This suggests that safflower may improve the absorption and utilization efficiency of nitrogen and phosphorus by increasing its CtPMAs transcription level in order to resist nutritional stress.

Key words: Carthamus tinctorius L., plasma membrane H+-ATPase gene family, bioinformatics analysis, low nitrogen stress, low phosphorus stress