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Heterologous synthesis of poly-γ-glutamic acid enhanced drought resistance in maize (Zea mays L.)

ABSTRACT: Drought stress is the main factor restricting maize yield. Poly-γ-glutamic acid (γ-PGA) could significantly improve the drought resistance and yield of many crops. However, its high production costs and unclear long-term impact on soil ecology limit its large-scale application. In this study, genes (PgsA, B, C) that participate in γ-PGA synthesis were cloned from Bacillus amyloliquefaciens and transformed into maize for the first time. Under drought stress, transgenic maize significantly increased the ear length, ear weight and grain weight by 50% compared to the control, whereas the above yield characteristics increased by 2.33, 13.06, 19.34 and 18.36%, respectively under normal growth conditions. γ-PGA was mainly expressed in the mesophyll cells of maize leaf rosette structure and improved drought resistance and yield by protecting and increasing the expression of genes for the photosynthetic and carbon fixation. This study is an important exploration for maize drought stress molecular breeding and building resource-saving agriculture.

ORGANISM(S): Zea mays

PROVIDER: GSE207858 | GEO | 2025/12/31

REPOSITORIES: GEO

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Effects of Maize Organ-specific Drought Stress Response on Yields from Transcriptome Analysis

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