文献类型： 外文期刊

作者： Mu, Demei ¹ ; Lin, Weitie ¹ ; Luo, Jianfei ¹ ;

作者机构： 1.South China Univ Technol, Sch Biol & Biol Engn, Guangdong Key Lab Fermentat & Enzyme Engn, Guangzhou 510006, Peoples R China

2.Anhui Acad Agr Sci, Agr Engn Res Inst, Hefei 230001, Peoples R China

关键词： Plant growth regulators; Native rhizobacteria; Spirodela polyrhiza; Heavy metal tolerance

期刊名称：JOURNAL OF PLANT GROWTH REGULATION （ 影响因子：4.8； 五年影响因子：4.8 ）

ISSN： 0721-7595

年卷期： 2023 年

页码：

收录情况： SCI

摘要： Plant growth regulators (PGRs) are well known for their ability to improve plants' tolerance to heavy metals. However, in these treatments, the contribution of native rhizobacteria on heightened tolerance to heavy metals is usually not considered, and thus PGR ability is overestimated. In this study, using duckweed Spirodela polyrhiza as indicating plant and according to the responses of it grown under nonsterile and sterile conditions, native rhizobacteria were able to cooperate with PGRs and thereby improved duckweed's tolerance to Cd stress. All the randomly selected bacterial isolates and salicylic acid exerted synergistic effects that improved Cd tolerance, suggesting that active rhizobacteria are not necessarily plant growth-promoting rhizobacteria (PGPRs). Comparative physiological and transcriptomic analyses showed that the cooperation between the native bacterium Pseudomonas and salicylic acid can greatly reduce Cd accumulation and decrease oxidative stress, thus lowering the requirement of antioxidant defense in duckweed; moreover, the synthesis of flavonoids that facilitates reactive oxygen species scavenging in duckweed was significantly induced. This study recommends that the contribution of native rhizobacteria on improved plant tolerance to heavy metals should be considered when applying PGRs.