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Poly-γ-glutamic Acid Promoted Maize Root Development by Affecting Auxin Signaling Pathway and the Abundance and Diversity of Rhizosphere Microbial Community by Haizhen Ma; Panpan Li; Ning Xiao; Tao Xia is a Agricultural and Biological Sciences article available to read on EtoBox.

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## Abstract ## Background The root systems of higher plants play an important role in plant growth and development. In our present study, it was found that poly-γ-glutamic acid (γ-PGA), an environmentally friendly biomacromolecule, significantly improved root development in maize. ## Results After treatment with γ-PGA for 7 days, the fresh weight of maize roots was significantly increased and the differences between γ-PGA treated group and control group were mainly caused by the number (higher by 71.87% compared to the control) and length of lateral roots. RNAseq and RT-PCR analyses showed that γ-PGA treatment upregulated the expression of genes related to the synthesis of auxins and auxin signal in maize roots. In addition, γ-PGA promoted the accumulation of plant growth-promoting bacteria, such as Azospirillum, Azohydromonas, Ramlibacter, and Sphingobium (Proteobacteria), Streptomyces (Actinobacteria), Parasegetibacter (Bacteroidetes), and Gemmatimonas (Gemmatimonadetes) in rhizosphere soil and the secretion of auxins. The results of this study deepened our understanding of the effects and mechanism of γ-PGA on maize root development, and as well as highlighted the possibility of

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Author

Haizhen Ma; Panpan Li; Ning Xiao; Tao Xia

Publisher

Springer Science and Business Media LLC

Published

2022

Language

EN

Field

Agricultural and Biological Sciences (Life Sciences)