MdLOG gene promoter deletion fragment and application of MdLOG gene promoter deletion fragment in detection of salt tolerance of malus plants

The invention discloses an MdLOG gene promoter deletion fragment and application of the MdLOG gene promoter deletion fragment in detection of salt tolerance of malus plants. The application of the MdLOG gene promoter deletion fragment as the molecular marker in any one of the following steps: detecting the salt tolerance of the rootstock of the malus plant, detecting the salt damage index of the malus plant, detecting whether the malus plant is a salt-tolerant plant or not, detecting whether the malus plant can be used as the salt-tolerant rootstock or not, and detecting whether the malus plant can be used as the salt-tolerant rootstock or not. The MdLOG gene promoter deletion fragment is a DNA (Deoxyribose Nucleic Acid) fragment as shown in SEQ ID No. 3. The MdLOG gene promoter fragment deletion phenomenon is in positive correlation with the salt tolerance, salt-tolerant plants in offspring can be rapidly screened by utilizing the deletion and existence of the fragment, and the method has important significa