Abstract:

To systematically sort out the research context of Tilia amurensis, deepen the understanding of its resource characteristics, and promote the scientific protection and efficient utilization of its resources, this paper comprehensively reviews the research progress of T. amurensis in the past few years from four core fields: physiology, ecology, genetic improvement, and propagation technology. In terms of physiological research, the influence mechanisms of low-temperature stress, salt stress, fertilization management, and light intensity regulation on key physiological characteristics such as osmotic adjustment substances and photosynthetic physiological indicators of T. amurensis leaves were analyzed. In ecological research, the action laws of mixed forestation models and site factors (such as slope, aspect, and soil thickness) on the growth dynamics of T. amurensis, as well as the regulation effects of thinning intensity on the wood quality (such as growth ring density and mechanical strength) of T. amurensis stands were expounded. In the genetic improvement research section, the latest achievements in T. amurensis provenance screening, seed orchard establishment (including key technologies such as ‘dense planting’ and ‘bidirectional retrograde mesh type dislocation method’ configuration), and the selection of superior families and superior clones were summarized. In the propagation technology research section, the technical parameters and application effects of T. amurensis seed propagation (such as seed dormancy release methods and sowing density optimization), grafting propagation (such as the selection of the best grafting time and method), cutting propagation (such as the optimization of substrate and hormone combinations), and tissue culture (such as different medium formulas and explant selection) were summarized in detail. Finally, in light of the current research status and production demands, four major directions for future T. amurensis research were proposed: first, strengthening the systematic collection, evaluation, and long-term preservation of T. amurensis germplasm resources; second, developing tissue culture rapid propagation technology systems for T. amurensis vegetative organs (such as axillary buds and stem segments) and promoting their industrial application; third, expanding the selection and promotion of T. amurensis as an urban greening tree species (with greening indicators such as tree shape and leaf color as breeding goals); fourth, deepening the research on the separation and purification of T. amurensis medicinal active components (such as flavonoids), pharmacological mechanisms, and related drug development, providing scientific support for the multi-functional development of T. amurensis resources.

Key words: Tilia amurensis, low temperature stress, light intensity, site factor, thinning intensity, genetic improvement, cuttage, tissue culture