Different tissues, including roots, stems, leaves, kernels, buds, and petioles, were collected from 25-year-old ginkgo trees at Nanjing Forestry University, Jiangsu, China. One-year-old seedlings of ginkgo leaves were obtained from April to October for different expression stages. For functional verification experiments, including transient expression and genetic transformation, we used Populus davidiana Dode × Populus bolleana Lauche cv. (“Shanxin Yang”) as a control (CK) poplar.
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