褪黑素处理对盐胁迫下马铃薯生长和光合作用的影响

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中图分类号：S532 文献标志码：A 文章编号：1673-2871（2025）12-102-08

Effects of melatonin treatment on the growth photosynthesis of SolanumtuberosumL.undersalt stress

Abstract： To mitigate the effectsof salt stress on the growth yield of potato，a pot experiment was conducted using the potato cultivar Favorita as the test material.A 150mmol⋅L-1 NaCl solution was used to simulate a salt-stressed environment.Two controlgroups weresetup：Control1（CKl，non-salt-stressed plantssprayed withdeionized）were established by spraying salt-stressed potato seedlings with melatonin at concentrations of 50，1oo，150， 200μmol⋅L-1 ，respectively.Thisstudyaimedtoinvestigatetheeffctsofdiferentmelatoninconcentrationsonthegrowth，development， photosyntheticcharacteristicsofpotatoundersaltstressTheresultsshowed thatfoliarapplicationofmelatoninatvarious concentrations could improve the salt stress resistance of potato.Compared with CK2，the maximum increases in plant height，stem diameter， leaf thickness of melatonin-treated potato were 39.05% ， 66.99% ， 128.07% ，respectively.Forphotosyntheticparameters，themaximumincreasesinchlorophyllcontent，netphotosyntheticrate，stomatal conductance，intercellular CO2 concentration， transpiration rate were 63.95% 61.08% 34.78% 28.07% ， 55.21% respectively.Regardingyield-related traits，themaximumincreases inabovegrounddrymas，aboveground freshmass， number of tubers per plant， average single tuber mass were 266.87% ， 97.96% ， 150% ， 114.47% ，respectively. Amongall melatonin treatments， T3（150μmol⋅L-1） exhibitedthehighest increments inall measured indices.Inconclusion，foliar application of melatonin can enhance the salt stress resistance of Favorita potato，with beingthe optimalconcentration.Thefindings provideanapplicationstrategyforgrowthregulators inpotatocultivationonsaline-alkali l offer theoretical support for the breeding of salt-tolerant potato cultivar.

KeyWords：Solanum tuberosumL.; Salt stress;Melatonin;Growth;Photosynthesis

马铃薯（SolanumtuberosumL.）是茄科茄属的一年生草本植物，属于浅根系作物，耐盐性较差，土地盐渍化导致马铃薯病害严重、减产甚至绝收，严重影响马铃薯产量及品质，也对经济效益造成巨大损失[。（剩余9451字）