Tissue Culture Response and In Vitro Plant Regeneration of 'Baiyun' (a New Cultivar of Ornamental Crabapple).

'Baiyun' (registration no. 20210210), a new crabapple cultivar, was registered in 2021 by the Nanjing Forestry Unversity. However, the difficult rooting has greatly limited the production of high-quality .