Acta Agrestia Sinica ›› 2020, Vol. 28 ›› Issue (5): 1275-1284.DOI: 10.11733/j.issn.1007-0435.2020.05.012

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Effects of seeds soaking with γ-aminobutyric acid on germination and aluminium tolerance of white clover

FU Jing-yan, LIANG Lin-lin, ZHOU Min, LI Zhou   

  1. College of Animal Science and Technology, Sichuan Agricultural University, Chengdu, Sichuan Province 611130, China
  • Received:2020-04-17 Revised:2020-06-17 Online:2020-10-15 Published:2020-09-19

伽马氨基丁酸浸种对铝胁迫下白三叶种子萌发及耐铝性的影响

符京燕, 梁林林, 周敏, 李州   

  1. 四川农业大学动物科技学院草学系, 四川 成都 611130
  • 通讯作者: 李州
  • 作者简介:符京燕(2000-),女,四川达州人,在读本科生,主要从事草类植物抗逆生理研究;E-mail:ison0114@163.com
  • 基金资助:
    国家大学生创新创业训练计划项目(201810626007)资助

Abstract: White clover (Trifolium repens ‘Haifa’) was selected as experimental material in this study,and effects of seeds soaking with gamma-aminobutyric acid (GABA) on germination and tolerance to aluminium (Al3+) stress were studied. The results showed that 1 mmol·L-1 Al3+ solution significantly inhibited seeds germination,and the damage becomes more obvious with the increase of Al3+ concentration. The germination and root length of seeds soaking with GABA significantly increased under Al3+ stress with the most obvious effect under 4 mmol·L-1 Al3+ stress. The antioxidant enzyme activity and non-enzymatic antioxidants content of seeds soaking with GABA significantly increased as well,thereby reducing oxidative damage effectively and improving cell membrane stability during germination under Al3+ stress. In addition,seeds soaking with GABA also significantly increased genes expression of dehydrins under Al3+ stress. Therefore,GABA-induced Al3+ tolerance could be related to the enhancement of antioxidant defense to reduce oxidative damage caused by stress and the up-regulation of dehydrins genes expression during white clover seeds germination.

Key words: Abiotic stress, Antioxidant, Oxidative damage, Dehydrins, AsA-GSH cycle

摘要: 本研究以‘海发’白三叶(Trifolium repens ‘Haifa’)为供试材料,研究伽马氨基丁酸(γ-aminobutyric acid,GABA)浸种预处理对铝(aluminium,Al3+)胁迫下白三叶种子萌发及耐Al3+性的影响。研究表明,1 mmol·L-1的Al3+溶液即能显著抑制白三叶种子的萌发,随着Al3+浓度的加大这种抑制作用也越明显。GABA浸种预处理显著提高Al3+胁迫下白三叶种子的萌发和根长,且在4 mmol·L-1的Al3+胁迫下效果最明显。GABA浸种也显著提高Al3+胁迫下抗氧化酶活性及非酶抗氧化物质含量,从而有效降低Al3+胁迫导致的氧化伤害,提高细胞膜稳定性。此外,GABA浸种也进一步上调了Al3+胁迫诱导的脱水蛋白基因表达。因此,GABA提高Al3+胁迫下白三叶种子的萌发可能与增强抗氧化防御以减轻胁迫造成的氧化损伤及上调脱水蛋白基因表达有关。

关键词: 非生物胁迫, 抗氧化, 氧化伤害, 脱水蛋白, 抗坏血酸-谷胱甘肽循环

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