NaCI处理对南瓜幼苗生长的影响及耐盐机制分析

打开文本图片集

中图分类号：S642.1 文献标志码：A 文章编号：1673-2871（2026）01-087-07

Abstract：To investigate the physiologicalregulatory mechanismofsalt stressonpumpkin growthand development，two pumpkinlines（360-3and20-8）with significantlydifferent salt tolerance wereusedasexperimental materials.A seedling-stage salt stress experiment was conducted tosystematicallyanalyze their physiological response characteristics. ThreeNaCl treatment concentrations of O， 20o，and 300mmol⋅L-1 were applied to examine the effects of salt stress on seedling growth，physiologicalmetabolism，andantioxidantenzymeactivity.Theresultsshowedthatwiththeincreaseof NaCl concentration，theseedling heightofboth lines decreased significantly，withagreater reductionobserved in20-8. The relative watercontent（RWC）of leaves anddry freshmass decreased with the increaseof saltconcentration; However， RWC inthesalt-tolerant line 36O-3remainedstable and was significantly beterthan thatofO-8.Salt stressaggravated cell membranedamage，andtherelativeelectricalconductivityof thetwopumpkinmaterials increased significantlywith the increase of salt concentration.In the response to antioxidant enzyme activity，under the treatment of 300mmol⋅L-1Na. Cl，the activity of superoxide dismutase，peroxidase，and catalase in 360-3 were significantly increased by 230.91% ， 284.72% ，and 40.82% ，respectively， compared with the control，which were substantially higher than 103.03% 24.96% ， and 22.89% of20-8，respectively.The hydrogen peroxide content of the two materialsunder NaCl increased by 37.07% and 39.95% ，respectively，indicating that salt-tolerant line 36o-3 more effectively alleviates oxidative damagethroughitsantioxidantsystem.Inconclusion，line36O-3exhibitsstrongersalttolerancethan20-8，mainlydueto its superior water retention capacity and enhanced antioxidant enzyme activity under salt stress.

Keywords：Pumpkin; Salt stress;Antioxidant enzyme;Physiological response

土壤盐渍化是指土壤表层或心土层中积累了过多的可溶性盐分，导致土壤盐分含量过高，从而影响作物的正常生长和发育1。（剩余9083字）