外源褪黑素、吲哚丁酸钾、γ-氨基丁酸引发对老化玉米种子萌发及生理特性的影响

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中图分类号：S153;S548 文献标识码：A 文章编号：1007-0435（2025）08-2494-08

Abstract： This study aimed to investigate the effects of melatonin，potassium indolebutyrate，and γ -aminobu tyric acid （GABA） on seed germination and physiological characteristics of aged maize（Zea mays L.） seeds， with a focus on identifying optimal initiators and their concentrations.In this experiment，the aged seeds of ‘Denghai 618⋅ were treated with different concentrations of melatonin （11.6141，23.2282，46.4564，69.6846 and 116.141mg-1L-1 ，potassium indolebutyrate（O.25，O.5，1.O，2.0 and 4.0mg∙L-1） and γ -aminobutyric acid（10，20，30，40 and 50mg⋅L-1 ）to initiate the treatments.The results demonstrated that treatments with 46.4564mg-1L-1 melatonin （MT3） ， 0.5mg⋅L-1 potassium indolebutyrate （ IBAK2） ，and 50mg⋅L-1 GABA （ GABA5） all significantly enhanced germination potential，germination rate，and seedling growth parameters in aged seeds. Notably，the melatonin treatment exhibited the most pronounced efects，showing a 133.62% increase（ ⋅P<0.05 ）in the seed viability index compared to the control.Furthermore，all three initiators enhanced antioxidant enzyme activities，promoted the accumulation of soluble sugars，soluble proteins，and pro line，reduced membrane system damage，and malondialdehyde content P<0.05） . Principal component analysisrevealed that the combined priming efficacy followed the order：melatonin > GABA > potassium indolebutyrate.The application of 46.4564mg-1L-1 melatonin （ MT3; ）was found to be the most efective in restoring the vigor of aged maize seeds.

Key words：Aging seeds;Seed initiation;Melatonin; Potassium indolebutyrate; γ -Aminobutyric acid

玉米（ZeamaysL.）作为中国极为重要的农作物，兼具粮食、经济作物和饲料的多重功能，在国家经济中具有举足轻重的地位。（剩余11442字）