文献类型： 外文期刊

作者： Ashraf, Umair ¹ ; Anjum, Shakeel Ahmad ⁴ ; Rasul, Fahd ⁴ ; Farooq, Muhammad Ansar ⁵ ; Abrar, Muhammad ⁷ ; Abbas, Farhat ⁸ ; Jin, Chuan ⁹ ; Hassan, Waseem ¹⁰ ; Tang, Xiangru ² ; Khan, Zaid ¹¹ ;

作者机构： 1.Univ Educ, Dept Bot, Div Sci & Technol, Lahore 54770, Punjab, Pakistan

2.South China Agr Univ, Coll Agr, Dept Crop Sci & Technol, Guangzhou 510642, Peoples R China

3.Michigan State Univ, Upper Peninsula Res & Extens Ctr, Chatham, MI 49816 USA

4.Univ Agr Faisalabad, Dept Agron, Faisalabad 38040, Punjab, Pakistan

5.Natl Univ Sci & Technol, Inst Environm Sci & Engn, Sch Civil & Environm Engn, Islamabad 44000, Pakistan

6.Ohio State Univ, CFAES Rattan Lal Ctr Carbon Management & Sequestra, Columbus, OH 43210 USA

7.Lanzhou Univ, Coll Ecol, State Key Lab Herbage Improvement & Grassland Agro, Lanzhou 730000, Peoples R China

8.Hainan Acad Agr Sci, Minist Agr & Rural Affairs,Coconstruct Minist & Pr, Key Lab Genet Resources Evaluat & Utilizat Trop Fr, Inst Trop Fruit Trees,Key Lab Trop Fruit Tree Biol, Haikou 571100, Peoples R China

9.Hainan Univ, Sch Ecol, Haikou 570228, Peoples R China

10.Muhammad Nawaz Shareef Univ Agr, Dept Soil & Environm Sci, Multan 60000, Punjab, Pakistan

11.Shenzhen Polytech Univ, Coll Architectural Engn, Shenzhen 518055, Peoples R China

关键词： antioxidants; chlorophyll; heavy metals; photosynthesis; yield; micronutrients

期刊名称：PLANTS-BASEL （ 影响因子：4.1； 五年影响因子：4.5 ）

ISSN： 2223-7747

年卷期： 2025 年 14 卷 16 期

页码：

收录情况： SCI

摘要： Lead (Pb) and cadmium (Cd) severely impair rice growth, yield, and grain quality. This study assessed the role of exogenous gamma-aminobutyric acid (GABA) in mitigating Pb and Cd toxicity in aromatic rice 'Guixiangzhan'. Treatments included the control (no Pb, Cd, or GABA), GABA (1 mM), Pb (800 mg/kg of soil)+GABA, Cd (75 mg/kg of soil)+GABA, Pb+Cd+GABA, Pb, Cd, and Pb+Cd without GABA. GABA improved chlorophyll and carotenoid, protein, proline and GABA contents whilst reducing oxidative stress under Pb/Cd toxicity. GABA application regulated antioxidant enzyme activities, net photosynthesis, and gas exchange, while its effects on nitrate reductase and glutamine synthetase were variable. Compared with Pb+Cd, the grain yields were 34.03%, 31.94%, 15.88%, 24.86%, and 17.32% higher in (Pb, Cd, Pb+Cd)+GABA, Pb, and Cd treatments, respectively. Furthermore, GABA reduced Pb and Cd accumulation in aboveground parts, while Ca, Mg, Fe, Cu, Zn, and Mn levels varied across treatments. Cd translocation was more from root-to-leaves, while Pb translocation was more from leaves-to-grains. Grain Pb and Cd positively correlated with their root, stem, and leaf contents but negatively with mineral nutrients. Overall, exogenous GABA mitigated Pb and Cd toxicity in aromatic rice.