Abstract
Background and aims
Plant-growth promoting rhizobacteria (PGPR) can promote plant performance under water deficit, but the physiology and biochemistry of the promoting process induced by PGPR under different water deficits is not well known in maize (Zea mays L).
Methods
A glasshouse study was conducted to determine the effects of Burkholderia sp. LD-11 on morphophysiological traits for plant growth and homeostasis between reactive oxygen species (ROS) and antioxidant enzymes under five regimens in two maize inbred lines.
Results
Soil inoculation with Burkholderia sp. LD-11 promoted biomass accumulation and improved instantaneous water-use efficiency (WUEi), regardless of the soil water availability. It also triggered production of indole-3-acetic acid (IAA), decreasing the accumulation of abscisic acid (ABA) induced by the water deficit, alleviated ROS accumulation, and resulted in a reduction in lipid peroxidation induced by the water deficits. Soil inoculation also enhanced the tolerance to water deficit through reducing stomatal aperture by increasing the sensitivity of stomatal conductance (g s) to small changes in ABA concentration in the leaves.
Conclusions
Soil inoculation with Burkholderia sp. LD-11 enhanced root systems and WUEi, offering a potential avenue for improving maize tolerance to water deficit.
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Abbreviations
- ABA:
-
Abscisic acid
- ACC:
-
1-aminocyclopropane-1-carboxylic acid
- CAT:
-
Catalase
- g s :
-
Stomatal conductance
- IAA:
-
Indole-3-acetic acid
- LWP:
-
Leaf water potential
- MDA:
-
Malondialdehyde
- PFC:
-
Pot soil water capacity
- PGPR:
-
Plant growth promoting rhizobacteria
- Pn :
-
Net leaf photosynthetic rate
- POD:
-
Peroxidase
- PPFD:
-
Photosynthetic photon flux density
- ROS:
-
Reactive oxygen species
- SOD:
-
Superoxide dismutase
- SWC:
-
Soil water content
- Tr :
-
Transpiration rate
- WUEi:
-
Instantaneous water-use efficiency
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Acknowledgments
The authors appreciate three anonymous referees for their valuable comments. We are also thankful to Dr. Yanlei Du for his comments on the manuscript and Mr. Dengfeng Dong for his experimental assistance. This research was supported by the NSFC project (31160287, 31360337), Guangxi Natural Science Foundation (2014GXNSFAA118098), and Project of the Special Basic Work of Ministry (2014FY120100).
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Fan, X., Hu, H., Huang, G. et al. Soil inoculation with Burkholderia sp. LD-11 has positive effect on water-use efficiency in inbred lines of maize. Plant Soil 390, 337–349 (2015). https://doi.org/10.1007/s11104-015-2410-z
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DOI: https://doi.org/10.1007/s11104-015-2410-z