期刊
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
卷 21, 期 4, 页码 -出版社
MDPI
DOI: 10.3390/ijms21041198
关键词
Malus baccata (L.) Borkh; MbNAC25; cold stress; salt stress
资金
- National Natural Science Foundation of China [31301757]
- Natural Science Fund Joint Guidance Project of Heilongjiang Province [LH2019C031]
- Young Talent Project of Northeast Agricultural University [19QC06]
- Open Project of Key Laboratory of Biology and Genetic Improvement of Horticultural Crops (Northeast Region), Ministry of Agriculture [neauhc201803]
- Postdoctoral Scientific Research Development Fund of Heilongjiang Province, China [LBH-Q16020]
- Fruit Tree Collaborative In novation and Promotion System of Heilongjiang Province
NAC (no apical meristem (NAM), Arabidopsis thaliana transcription activation factor (ATAF1/2) and cup shaped cotyledon (CUC2)) transcription factors play crucial roles in plant development and stress responses. Nevertheless, to date, only a few reports regarding stress-related NAC genes are available in Malus baccata (L.) Borkh. In this study, the transcription factor MbNAC25 in M. baccata was isolated as a member of the plant-specific NAC family that regulates stress responses. Expression of MbNAC25 was induced by abiotic stresses such as drought, cold, high salinity and heat. The ORF of MbNAC25 is 1122 bp, encodes 373 amino acids and subcellular localization showed that MbNAC25 protein was localized in the nucleus. In addition, MbNAC25 was highly expressed in new leaves and stems using real-time PCR. To analyze the function of MbNAC25 in plants, we generated transgenic Arabidopsis plants that overexpressed MbNAC25. Under low-temperature stress (4 degrees C) and high-salt stress (200 mM NaCl), plants overexpressing MbNAC25 enhanced tolerance against cold and drought salinity conferring a higher survival rate than that of wild-type (WT). Correspondingly, the chlorophyll content, proline content, the activities of antioxidant enzymes superoxide dismutase (SOD), peroxidase (POD) and catalase (CAT) were significantly increased, while malondialdehyde (MDA) content was lower. These results indicated that the overexpression of MbNAC25 in Arabidopsis plants improved the tolerance to cold and salinity stress via enhanced scavenging capability of reactive oxygen species (ROS).
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