草业学报2025，Vol.34Issue(4)：93-103,11.DOI:10.11686/cyxb2024181
干旱胁迫及复水对裸果木幼苗生理特性的影响
Effects of drought stress and rehydration on the physiological characteristics of Gymnocarpos przewalskii seedlings
摘要
Abstract
Gymnocarpos przewalskii is an endemic species in the desert region of central Asia.It is tolerant to drought and barrenness,with a strong ability to reduce wind erosion and stabilize sand.Thus,it is a key wild plant for environmental protection in China.The aim of this work was to determine how drought stress affects the physiological characteristics of the leaves of G.przewalskii seedlings,and to evaluate their ability to recover after rewatering,with a view to exploring its drought adaptation mechanism.In these experiments,2-year-old G.przewalskii seedlings were subjected to drought treatments(soil moisture at 40％—50％,30％—40％,20％—30％,10％—20％,and 5％—10％of field capacity)or control conditions(soil moisture at 60％—70％of field capacity)and then rewatered.The leaf water potential,osmotic regulator content,and antioxidant indexes were determined to investigate its responses to drought and rewatering.The results showed that proline(Pro),soluble protein(SP),soluble sugar(SS),and malondialdehyde contents and peroxidase(POD)activity increased significantly as the duration of the drought treatments extended.Superoxide dismutase(SOD)activity first increased and then decreased,and catalase(CAT)activity and leaf water potential showed a decreasing trend during the drought treatments.The SP content and SOD and CAT activities recovered to levels similar to those in the control at the 5th day after rewatering,and other indexes recovered to levels similar to those in the control at the 10th day after rewatering.Under drought stress,G.przewalskii seedlings reduced their osmotic potential by actively accumulating Pro,SP,and SS,and adopted a drought-tolerant state by maintaining a low water potential.In drought-affected seedlings,reactive oxygen species were effectively scavenged because of increased activities of SOD and POD and the accumulation of ascorbic acid.After rewatering,the G.przewalskii seedlings showed a strong ability to recover.These findings provide new information about the drought adaptation mechanism of G.przewalskii,a plant with potential uses in environmental conservation projects.关键词
裸果木/干旱胁迫/复水/渗透调节物质/抗氧化指标Key words
Gymnocarposprzewalskii/drought stress/rehydration/osmoregulatory substances/antioxidant indexes引用本文复制引用
王小风,马步东,黄海霞,罗永忠,齐建伟,邓卓..干旱胁迫及复水对裸果木幼苗生理特性的影响[J].草业学报,2025,34(4):93-103,11.基金项目
国家自然科学基金(32160409)和横向合作项目"沙化土地封禁保护区社会经济效益监测"(03723019)资助. （32160409）
