中国蔬菜Issue(6)：162-167,6.DOI:10.19928/j.cnki.1000-6346.2025.4020
高温胁迫下外源褪黑素对番茄幼苗生长及生理特性的影响
Regulation of Exogenous Melatonin on the Growth and Physiological Characteristics of Tomato Seedlings under High Temperature Stress
摘要
Abstract
High-temperature stress is an important environmental factor limiting the growth and development of tomato(Solanum lycopersicum L.),while melatonin(melatonin,MT),as a multifunctional plant growth regulator,plays an important role in enhancing plant stress resistance.This study investigated the regulatory effects of exogenous melatonin(200 μmol·L-1)on the growth and physiological characteristics of tomato seedlings under high-temperature stress(38℃/25 ℃,day/night).The results indicated that high-temperature stress significantly inhibited seedling growth,reducing plant height,stem diameter,leaf length,and leaf width by 25.6％,30.6％,20.6％,and 27.5％,respectively.At the same time,malondialdehyde(MDA)content and relative conductivity increased significantly.Melatonin treatment restored plant height and stem diameter to the control level at normal temperature,and significantly reduced the MDA content on the 6th and 9th days after treatment and the relative conductivity content on the Day 3,Day 6,and Day 9 after treatment,thereby maintaining membrane integrity.High-temperature stress induced increased activities of activities of superoxide dismutase(SOD),catalase(CAT),and peroxidase(POD)in tomato seedlings,and melatonin further enhanced the activities of SOD,CAT,and POD.Additionally,melatonin promoted the accumulation of osmoregulatory substances,and the proline content increased by 67.9％.Comprehensive analysis suggests that melatonin alleviated heat-induced damage by enhancing antioxidant defense and osmoregulation capacity.关键词
番茄/高温胁迫/褪黑素/抗氧化酶/渗透调节Key words
Solanum lycopersicum/high temperature stress/melatonin/antioxidant enzymes/osmotic adjustment引用本文复制引用
冯丽燕,王国强,李鹏,乜兰春,赵文圣..高温胁迫下外源褪黑素对番茄幼苗生长及生理特性的影响[J].中国蔬菜,2025,(6):162-167,6.基金项目
河北省现代农业产业技术体系设施蔬菜创新团队建设项目(HBCT2023100208) （HBCT2023100208）
