Work

Morphological changes and physiological responses of Lycoris radiata leaves under high temperature treatment

Year: 2025

Type: article

Abstract: Objective This study aims to investigate the morphological changes and physiological responses of Lycoris radiata（L’Herit.）Herb. under high-temperature stress，and preliminarily elucidate the mechanisms underlying high-temperature-induced dormancy，thus providing a scientific basis for stress-resistant cultivation and further research on the summer dormancy mechanisms of this species. Method Using ambient temperature（day/night：25 ℃/20 ℃）as the control（CK），leaf morphology and related physiological parameters were compared under two high-temperature treatments：A（37 ℃/30 ℃）and B（40 ℃/33 ℃）. Result （1）Under room temperature treatment，the phenomenon of “leaf tip yellowing and withering” first appeared on the 20th day，while the complete leaf senescence did not occur.In contrast，under treatments 37 ℃/30 ℃ and 40 ℃/33 ℃ leaf tip yellowing appeared as early as day 7 and day 1，respectively，and complete leaf senescence occurred by day 21 and day 18，respectively.（2）With increasing temperature，relative water content（RWC），total chlorophyll，soluble sugar，and soluble protein content in leaves showed a declining trend，while the content of superoxide anion（O₂·⁻）and peroxidase（POD）activity increased significantly.Activities of superoxide dismutase（SOD） and catalase（CAT）displayed a “rise-then-fall” pattern. Conclusion High-temperature stress significantly influences the leaf growth and physiological metabolism of L. radiata，as evidenced by accelerated leaf senescence，increased water loss，elevated reactive oxygen species（ROS）levels，and marked reductions in chlorophyll，soluble sugars，and soluble proteins.Although L. radiata can mitigate oxidative damage to some extent by enhancing antioxidant enzyme activities and modulating ROS levels，its self-regulation capacity remains limited.

Source: ACTA AGRICULTURAE UNIVERSITATIS JIANGXIENSIS

DOI: 10.3724/aauj.2025131

Authors: Xuying WEI, Ting WEN, Xi WANG, Yiyang CHEN, Xin YOU, Junhuo CAI

Institutions: Jiangxi University of Finance and Economics, Jiangxi Agricultural University

Language: English

Topic: Plant Stress Responses and Tolerance

Subfield: Plant Science

Field: Agricultural and Biological Sciences

Domain: Life Sciences

SDG: Zero hunger

Open Access status: bronze

Funder: National Natural Science Foundation of China