γ-氨基丁酸和褪黑素对镉胁迫下毛桃幼苗生长及镉积累的影响

Effects of γ-Aminobutyric Acid and Melatonin on Growth and Cadmium Accumulation of Peach Seedlings under Cadmium Stress

  • 摘要:
    目的 探讨外源γ-氨基丁酸(GABA)和褪黑素对镉胁迫下毛桃幼苗生长及镉积累的影响,找出降低桃树镉积累的方法。
    方法 以毛桃幼苗为试验材料,采用盆栽试验方法,通过叶面喷施150 μmol L−1褪黑素及浇灌0.5 mmol L−1 GABA处理,探究0.1 mg L−1镉胁迫下褪黑素和GABA对毛桃幼苗生长及镉积累的影响。
    结果 在镉胁迫下,GABA、褪黑素和GABA + 褪黑素处理均在一定程度上增加了毛桃幼苗的株高、生物量及光合色素(叶绿素a、叶绿素b、叶绿素总量和类胡萝卜素)含量,改变了毛桃幼苗对养分的吸收。此外,GABA和GABA + 褪黑素处理降低了毛桃幼苗的根系和地上部分镉含量,而褪黑素处理只降低了毛桃幼苗根系镉含量,对地上部分镉含量没有显著影响。与镉处理相比,GABA和GABA + 褪黑素处理使毛桃幼苗地上部分镉含量降低了21.85%和26.99%。
    结论 在镉胁迫下,GABA、褪黑素和GABA + 褪黑素均能促进毛桃幼苗的生长,其中GABA和GABA + 褪黑素还能降低毛桃幼苗对镉的积累。

     

    Abstract:
    Objective This study aimed to explore the effects of exogenous γ-aminobutyric acid (GABA) and melatonin on the growth and cadmium (Cd) accumulation in peach seedlings under Cd stress, and to identify the methods of reducing cadmium accumulation in peach trees.
    Method Peach seedlings were used as experimental materials, a pot experiment was conducted, in which the seedlings were treated with foliar spraying of 150 μmol L−1 melatonin and irrigation with 0.5 mmol L−1 GABA to investigate the effects of melatonin and GABA on the growth and Cd accumulation in peach seedlings under 0.1 mg L−1 Cd stress.
    Result Under Cd stress, GABA, melatonin and GABA + melatonin treatments increased the plant height, biomass and photosynthetic pigments (chlorophyll a, chlorophyll b, total chlorophyll, and carotenoid) contents of peach seedlings to a certain extent, and changed the nutrient absorption of peach seedlings. In addition, GABA and GABA + melatonin treatments decreased the contents of Cd in root and shoot of peach seedlings, while melatonin treatment only reduced Cd in root and had no significant effect on Cd in shoot. Compared with Cd treatment, GABA and GABA + melatonin treatments decreased Cd in shoot in peach seedlings by 21.85% and 26.99%, respectively.
    Conclusion Under Cd stress, GABA, melatonin and GABA + melatonin treatments can promote the growth of peach seedlings, and GABA and GABA + melatonin treatment can also reduce the Cd accumulation in peach seedlings.

     

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