外源褪黑素对甜瓜坐果后叶片衰老的缓解效应

打开文本图片集

分类号：S652 文献标志码：A 文章编号：1673-2871（2025）10-091-0

Alleviating effects of exogenous melatonin on leaf senescence of muskmelon after fruit setting

ZHENG Haiqiang，LIU Mengze，LIU Haihe， ZHANG Yanping， CAO Yanxia， ZHU Libao （CollegeofHorticulture，HbeiAgriculturalUiverity，aodingl，Hebeiina）

Abstract：Toinvestigatetheefectsofexogenous melatoninonleafsenescence inmuskmelon，thevarietyNongda103 was usedasthetestmaterial.Duringtheflowering periodoffemale flowers in spring greenhouse conditions，exogenous melatonin solutions of 100，200，300，and 400μmol⋅L-1 were sprayed on the leaves，with distilled water as the control. Physiological indicatorsofchlorophyll，reactiveoxygen speciesmetabolism，andnitrogenmetabolism inleavesatthe fruitingnodewerecomparedandanalyzed.Theresultsshowedthatfrom14to35daysafterthefirsttreatment，compared with the control， the 200μmol⋅L-1 melatonin treatment significantly increased the chlorophyll content by 37.21%-77.36% the chlorophyll fluorescence value Fv/Fm andETRby 11.97% 18.36% and 38.41% 44.63% ，theactivitiesof antioxidant enzymes SOD， POD，and CAT by 12.54%-29.30% ， 18.28%-38.92% ，and 67.05%-207.69% ，the activities of nitrogen metabolism enzymes NR and GS by 20.63% 60.00% and 6.34% 11.84% ，respectively，while the O2- ·production rate was significantly reduced by 34.75%-47.81% .In conclusion， exogenous melatonin can enhance antioxidant enzyme activity， accelerate reactive oxygen species scavening，thereby delaying leaf senescence，and further improve leaf photosynthetic performance and nitrogenmetabolism capacity，promoting plant growth.Under the conditions of this experiment，the 200μmol⋅L-1 melatonin treatment showed the best effect in delaying early leaf senescence.

Keywords：Muskmelon;Melatonin; Aging;Physiological characteristics

厚皮甜瓜为一年生草本植物，是世界范围内重要的园艺作物之一，果实富含大量维生素C、胡萝卜素及钾元素，具有较高的营养价值。（剩余9444字）