Abstract:Hemerocallis, known as the mother flower of China, is a perennial root flower with important ornamental and medicinal values. Abiotic stresses lead to reduced photosynthetic efficiency, altered concentrations of osmoregulatory substances, increased levels of reactive oxygen species (ROS) and sustained damage to the membrane system, inducing the expression of gene families such as AP2/ERF and WRKY. The effects of drought, flooding, salinity, extreme temperature and heavy metal stress factors on the morphology, physiology, biochemistry and molecular level of Hemerocallis were reviewed, and the resources of Hemerocallis resistance cultivars under various stresses were counted. It was proposed that the effects of region and stress on the metabolic changes of medicinal components of Hemerocallis, the regulatory network of stress-related genes and multiple stress complex molecular breeding should be the key research directions in the future. It would provide a theoretical reference for the development and utilization of Hemerocallis resources and breeding of resistant varieties.
