Abstract
Global warming and worsening environmental problems have worsened the heat resistance of peony and difficult maintenance and management. The high temperature stress caused by the environment has become an important environmental factor for the growth and development of peony. The article summarizes the morphology, yield, physiological and biochemical indicators and research status of peony under high temperature stress; summarizes the research status of peony heat tolerance evaluation index screening, germplasm heat tolerance evaluation and heat-resistant peony breeding, in order to promote tolerance Selection and breeding process of hot peony germplasm resources. At present, related researches on peony mainly focus on pharmacological effects and germplasm resources. The physiological mechanism of high temperature and breeding of heat-resistant varieties of peony are relatively lagging behind. In-depth study of the physiological mechanism of high temperature in peony combined with multi-omics will help to adopt technical measures to improve the heat tolerance of high plants and reduce heat damage, so as to speed up the selection and breeding of heat-resistant peony germplasm, and meet the survival and medicine of peony in harsh environments. Use and other needs.
Highlights
Peony (Paeonia suffruticosa Andr.) is an ornamental flower of the peony group of the genus Paeoniaceae[1]
Zhang and Wu[8,15] sprayed three exogenous substances on peony seedlings in the late stage of high temperature stress (>4 d), and the results showed that the concentrations were 40 mg/L abscisic acid (ABA) and 100 mol/L salicylic acid (SA), 40 mmol/L calcium chloride (CaCl2) can significantly improve the dry quality of each part of peony and relieve high temperature damage
The selection of cross parents affects the compatibility of crosses, leading to problems such as fertilization obstacles, stunted growth, and reduced resistance
Summary
Peony (Paeonia suffruticosa Andr.) is an ornamental flower of the peony group of the genus Paeoniaceae[1]. Li et al.[11] found that with the prolongation of high temperature treatment, the leaf stalks of potted ‘Fengdan’ became soft and drooping, and the root vigor of the plant inoculated with AM fungus (Arbuscular Mycorrhizal) was higher than that of the control; Guo et al.[12] Inoculate 2 kinds of AM fungi, compare their leaf anatomical structure (palisade tissue and sponge tissue), the study found that the AM fungus G. mosesii's ‘Fengdan’ leaf cells are arranged more tightly and plants are compared with AM fungus G. mosesii The growth is better; Ren et al.[13] used epibrassinolide (EBR) at a concentration of 1.0 mg/L to treat the ultrastructure of ‘fengdan’ leaves under heat stress, and found that the cell membrane, chloroplast and other structures were compared The control is more complete It shows that heat-resistant peony varieties have stronger ability to resist heat damage, and AM fungus or EBR treatment can reduce the damage of peony cell structure. The study of exogenous hormones provides a basis for alleviating the problem of high temperature stress in peony
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