Effects of Spraying Exogenous γ-aminobutyric Acid on Growth and Yield of Rice with Different Salt Tolerance under Salt Stress
Received date: 2024-07-29
Online published: 2025-03-12
In order to explore the effects of exogenous γ-aminobutyric acid (GABA) spraying on the yield and physiological traits of different salt tolerance rice varieties, the salt-tolerant variety Lianjian 5 and the salt-sensitive variety Lianjing 7 were used as experimental materials. Under salt stress of 0.2% (2 g/kg), three different concentrations of exogenous GABA spraying treatments (50 μmol/L, 100 μmol/L, and 150 μmol/L) were set, with water spraying as the control. The results showed that spraying exogenous GABA could alleviate the inhibitory effects of salt on rice growth, with the treatment of spraying with 150 μmol/L GABA showing the best effect. Compared with the salt-sensitive variety, the salt-tolerant variety showed more significant improvement after exogenous GABA spraying, characterized by larger leaf area, higher content of chlorophyll a and chlorophyll b, SPAD value, and photosynthetic rate. Additionally, salt-tolerant variety also exhibited higher activities of superoxide dismutase(SOD) and peroxidase(POD), higher potassium (K+) content, and lower sodium(Na+) content, while the contents of endogenous GABA and abscisic acid(ABA) also increased. In summary, spraying exogenous GABA can increase the content of endogenous GABA and ABA in salt tolerant rice varieties, thereby ensuring photosynthetic capacity, antioxidant enzyme activity, and ion balance, maintaining better agronomic traits, and ultimately increasing yield under salt-stress conditions.
Key words： rice; exogenous GABA; salt stress; agronomic traits; physiological traits; yield
SHU Chenchen, ZHOU Tianyang, GU Yibiao, CUI Ruilong, LIU Chang, GU Junfei . Effects of Spraying Exogenous γ-aminobutyric Acid on Growth and Yield of Rice with Different Salt Tolerance under Salt Stress[J]. China Rice, 2025 , 31(2) : 35 -42 . DOI: 10.3969/j.issn.1006-8082.2025.02.006
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