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Moso bamboo is a large woody bamboo with the highest ecological, economic, and cultural value among all bamboos in Asia. However, environmental stress influences its growth and development and limits its geographic distribution. Therefore, improving its resistance to environmental stress is extremely important. Dehydration responsive element binding (DREB) transcription factors perform an important role in the regulation of stress-related genes, enhancing the resistance of plants to abiotic stress. In the current study, two novel DREB genes, PeDREB2A and PeDREB1A (Gene ID No. PH01000046G1730 and PH01000668G0350), were isolated from moso bamboo and the sequences were identified and characterized (coding sequence lengths were 795 and 825 bp, respectively). The PeDREB2A and PeDREB1A proteins were estimated to have typical AP2/ERF domains, molecular weights of 28.96 and 28.84 kDa, and isoelectric points of 9.47 and 5.34, respectively. RT-PCR analysis revealed that PeDREB2A and PeDREB1A were tissue-specific genes, expressed in leaves, young stems, and roots, with similar expression levels in leaves and young stems. qRT-PCR analysis of leaves demonstrated that PeDREB2A transcription levels rapidly accumulate following exposure to drought and salt stress, peaking at 12 and 0.5 h, respectively, but only low expression levels were observed under cold stress. PeDREB1A exhibited a strong response to cold stress, reaching a peak in expression 3 h after exposure, but demonstrated only a slight response to drought and salt stress. In roots, PeDREB2A was down-regulated, and PeDREB1A was initially upregulated but then declined, under stress conditions. Two plant expression vectors, pCAMBIA2300- CaMV35S-PeDREB2A and pCAMBIA2300-CaMV35S-PeDREB1A were also successfully constructed.

Cloning and stress response analysis of the PeDREB2A and PeDREB1A genes in moso bamboo (Phyllostachys edulis)