12/5/2023 0 Comments Purple plum tree scientific name![]() ![]() The light intensity was 1500 to 2000 Lux. The culture medium used was MS (Murashige and Skoog media) + naphthalene acetic acid (NAA) 0.1 mg/L + butyl acrylate (BA) 0.8 mg/L. The stem segments should be soaked in a solution of 0.1% HgCl 2 for 10 min, washed three to four times with sterile water, and inoculated on the starter medium. The stems should be cut 2 to 3 cm with buds. Then, the leaves should be removed and washed under tap water. ![]() Shoots with buds of ‘Xiahong’ that grew healthily in May and June should be selected. Preliminary experiments suggest the application of the following tissue culture propagation techniques. Therefore, tissue culture is a more effective way to propagate them ( Zenna, 2020). Cuttings from this cultivar have poor adventitious root formation, a low rate of survival, and a slow growth rate during propagation. This cultivar is cold-resistant, which renders it suitable for planting in USDA Cold Hardiness Zones 4 through 10. Its growth period is ≈270 d, and the red leaf period is more than 250 d in Nantong, Jiangsu, China (lat. ![]() ‘Xiahong’ has a long period during which its leaves are red. The final deciduous stage occurs ≈28 d later ( Li et al., 2013). The leaves of ‘Xiahong’ usually fall ≈17 to 24 d later than those of other purple-leaf plum cultivars during the initial deciduous leaf stage. ‘Xiahong’ also has a late deciduous period. It retains an excellent condition of new budbreak and extension of young leaves in the summer, whereas other cultivars are affected by hot temperatures to varying degrees. In addition, ‘Xiahong’ has one unique characteristic. However, the rest of the leaves remain purple (FAN2-N77A). Although the mature leaves of most other purple-leaf plum cultivars turn green (FAN3-135C) in the summer, only the central part of ‘Xiahong’ leaves fade and turn bluish purple (FAN2-N92A) ( Li et al., 2007 Zhang et al., 2013). The ornamental characteristics of ‘Xiahong’ are leaves that are large and intensively red (FAN2-59A). Currently, ‘Xiahong’ is widely used in landscape architecture in southeastern China. ‘L0630’ was officially designated ‘Xiahong’ in 2013, and it was released by the Jiangsu Yanjiang Institute of Agricultural Sciences (Nantong, Jiangsu, China) in 2014. The project team finally identified the excellent purple-leaf plum ‘L0630’ from the bud transformation of Chinese purple-leaf plum and found it to be a cultivar that is worth popularizing. The process of both the second and final selection involved a comprehensive evaluation of the parent plant materials, vegetatively propagated plants, and multipoint tests for more than 10 years. These superior plants were used to conduct multipoint (multiple location) observations. During the period of primary selection, the pre-selected trees with marked numbers were systematically investigated and evaluated for 3 years, and preselected trees that had excellent and stable characteristics were selected as primary superior plants. Outstanding single seedlings or branches were then marked and numbered individually as pre-selected trees during the whole plum growing season. During the first step of pre-selection, we conducted a field survey in the nursery. In our project, the selection and breeding of new cultivars of purple-leaf plum strictly followed the process of pre-selection, primary selection, second selection, and final selection. Therefore, the bud transformation always changes by one branch. However, until the mutant bud germinates and grows into a branch, significant morphological differences from the original variety can easily be observed. Bud selection is a type of somatic mutation that occurs in the meristematic cells of the bud. The Purple-leaf Plum Resource Nursery was established to use the directional selection method of bud transformation. Our research team began to introduce and breed different cultivars of plum in 2002, with the goal of producing new cultivars of the purple-leaf plum. ![]()
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