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ORIGINAL RESEARCH
Effects of Gamma-Aminobutyric Acid (GABA)
on Cadmium Accumulation in Rice Seedlings
1
Crop Characteristic Resources Creation and Utilization Key Laboratory of Sichuan Province, Mianyang Academy
of Agricultural Sciences, Mianyang, Sichuan, China
2
Zigong Academy of Agricultural Sciences, Zigong, Sichuan, China
3
The Experimental High School Attached To UESTC, Chengdu, Sichuan, China
4
College of Horticulture, Sichuan Agricultural University, Chengdu, Sichuan, China
Submission date: 2024-10-29
Final revision date: 2025-01-01
Acceptance date: 2025-01-24
Online publication date: 2025-03-27
Corresponding author
Dingyou Liu
Crop Characteristic Resources Creation and Utilization Key Laboratory of Sichuan Province, Mianyang Academy of Agricultural Sciences, Mianyang, Sichuan, China
Crop Characteristic Resources Creation and Utilization Key Laboratory of Sichuan Province, Mianyang Academy of Agricultural Sciences, Mianyang, Sichuan, China
KEYWORDS
TOPICS
ABSTRACT
To reduce cadmium (Cd) accumulation in rice, the effects of gamma-aminobutyric acid (GABA)
on growth and Cd accumulation in rice seedlings were investigated in a pot experiment under Cd
stress. The results indicated that treatment with 1 mg/L Cd significantly decreased the biomass,
photosynthetic pigment content, photosynthesis rate, and antioxidant enzyme activity of rice seedlings.
Consequently, exposure to 1 mg/L Cd-induced stress in rice seedlings, thereby inhibiting the growth
of rice seedlings. Under Cd stress, concentrations of 0.1, 0.25, and 0.5 mmol/L GABA enhanced
the biomass, photosynthetic pigment content, and photosynthesis of rice seedlings, whereas
a concentration of 1 mmol/L GABA did not significantly affect these parameters. Lower concentrations
(0.1 and 0.25 mmol/L) of GABA reduced the antioxidant enzyme activity and Cd contents in the roots,
stems, and sheaths of rice seedlings under Cd stress, whereas higher concentrations (0.5 and 1 mmol/L)
increased these parameters. Specifically, the concentrations of 0.1, 0.25, 0.5, and 1 mmol/L GABA
decreased leaf Cd content by 78.79%, 71.74%, 56.77%, and 28.82%, respectively, compared with the Cd
treatment. Therefore, the concentrations of 0.1 and 0.25 mmol/L GABA not only promote the growth of
rice but also reduce Cd accumulation in rice under Cd stress.
CONFLICT OF INTEREST
The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
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