首页|外源γ-氨基丁酸对喜树镉积累的影响

外源γ-氨基丁酸对喜树镉积累的影响

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为了降低喜树对镉的积累,本研究采用盆栽试验,研究了外源γ-氨基丁酸(GABA)对喜树镉积累的影响.结果表明,浓度为1 mg·L-1的镉处理降低了喜树生物量,对喜树产生了胁迫.在镉胁迫条件下,浓度为0.1 mmol·L-1和0.5 mmol·L-1的GABA提高了喜树植株生物量,并提高了根冠比.就镉积累而言,不同浓度0.1、0.5、1.0和2.0 mmol·L-1的GABA均降低了喜树根系和地上部分镉含量、镉积累量和富集系数.浓度为0.1 mmol·L-1的GABA的降镉作用最好,使喜树根系和地上部分镉含量分别较对照降低了 31.77%和62.82%.此外,不同浓度的GABA在一定程度上降低了喜树的转运系数.因此,外源GABA能够在一定程度上促进镉胁迫下喜树的生长,并降低喜树对镉的积累,其中,浓度为0.1 mmol·L-1的GABA降镉效果最好.
Effect of Exogenous γ-aminobutyric Acid on Cadmium Accumulation in Camptotheca acuminata
To reduce the cadmium(Cd)accumulation in Camptotheca acuminate,a pot experiment was conducted to study the effects of exogenous γ-aminobutyric acid(GABA)on the Cd accumulation in C.acuminate.The results showed that the concentration of 1 mg·L-1Cd treatment decreased the biomass of C.acuminate,and produced the stress to C.acuminate.Under Cd stress,the concentrations of 0.1 mmol·L-1 and 0.5 mmol·L-1 GABA increased the biomass of C.acuminate and increased the root-shoot ratio.For the Cd accumulation,the different concentrations 0.1,0.5,1.0 and 2.0 mmol·L-1 of GABA decreased the Cd contents,Cd accumulation amounts and bioconcentration factors in both roots and shoots of C.acuminate.The concentration of 0.1mmol·L-1 GABA had the best reduction effect of Cd,which decreased the Cd contents in roots and shoots of C.acuminate by 31.77%and 62.82%,respectively,compared with the control.In addition,different concentrations of GABA reduced the translocation factor of C.acuminate to a certain extent.There-fore,exogenous GABA can promote the growth of C.acuminate under Cd stress and reduce the Cd accumulation in C.a-cuminate to a certain extent,among which.the concentration of 0.1 mmol·L-1 of GABA has the best effect on Cd re-duction.

γ-aminobutyric acid(GABA)cadmium stressCamptotheca acuminata

曹玉桃、雷青、金鑫、周珂萱、李艳、蔡永寿

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九寨沟风景名胜区管理局 阿坝藏族羌族自治州 623402

四川农业大学园艺学院 成都 611130

绵阳师范学院生态安全与保护四川省重点实验室 绵阳 621000

γ-氨基丁酸 镉胁迫 喜树

2024

湖北林业科技
湖北省林业科学研究院

湖北林业科技

影响因子:0.398
ISSN:1004-3020
年,卷(期):2024.53(5)