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PP2C protein phosphatase family is one of the largest gene families in the plant genome. Many PP2C family members are involved in the regulation of abiotic stress. We found that  BpPP2C1  gene has highly up-regulated in root under salt stress in  Betula platyphylla . Thus, transgenic plants of  Betula platyphylla  with overexpression and knockout of  BpPP2C1  gene were generated using a zygote transformation system. Under NaCl stress treatment, we measured the phenotypic traits of transgenic plants, chlorophyll-fluorescence parameters, peroxidase (POD) activity, superoxide dismutase (SOD) activity, and malondialdehyde (MDA) content. We found that  BpPP2C1  overexpressed lines showed obvious salt tolerance, while  BpPP2C1  knocked out plants were sensitive to salt stress. Transcriptome analysis identified significantly amount of differentially expressed genes associated with salt stress in  BpPP2C1  transgenic lines, especially genes in abscisic acid signaling pathway, flavonoid biosynthetic pathway, oxidative stress and anion transport. Functional study of  BpPP2C1  in  Betula platyphylla  revealed its role in salt stress.

Functional Study of BpPP2C1 Revealed Its Role in Salt Stress in Betula platyphylla