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Molecular mechanism of negative pressure irrigation inhibiting root growth and improving water use efficiency in maize

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Abstract

Aims

This study assessed the effect of stable soil water content on root growth and water use efficiency in maize under a negative pressure irrigation system.

Methods

A two-year pot experiment for maize was carried out under negative pressure irrigation and drip irrigation. The root growth characteristics and water use efficiency by the maize was evaluated. In addition, transcriptome sequencing was conducted to explore the pathways and genes that respond to variations in soil water content.

Results

Negative pressure irrigation more effectively increased the accumulation of above-ground dry matter and root vitality compared to drip irrigation but it reduced the accumulation of root dry matter, and root-shoot ratio. Negative pressure irrigation also reduced levels of superoxide anion, malondialdehyde, proline, soluble protein, and soluble sugar contents, and the activities of superoxide dismutase, peroxidase, catalase and polyphenol oxidase. It was also observed that genes involved in starch and sucrose metabolism, phenylpropanoid biosynthesis, amino sugar and nucleotide sugar metabolism, glycolysis/gluconeogenesis pathways, were downregulated under negative pressure irrigation which suppressed root growth. Three GO terms, channel activity, water transport, and water channel activity, were highly enriched under negative pressure irrigation. Thirteen genes related to water absorption and transport such as ZM00001D003006 and ZM00001D014285 were significantly up-regulated.

Conclusions

Negative pressure irrigation improved the water use efficiency by maize crops and inhibited root growth. Zm00001d024891 and Zm00001d003190 were found to be associated with root growth, whereas ZM00001D003006 and ZM00001D014285 participated in the control of water absorption and water use efficiency.

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Data availability

The datasets generated during and/or analysed during the current study are available in the GEO Gene Expression Omnibus (GEO) database repository, under accession number GSE180352.

Code availability

Not applicable.

References

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Acknowledgements

Thank He Xiaolei and Liu Zhenping for their help in sampling and physiological index determination.

The study was supported by the National Key Research and Development Program of China (2018YFE0112300).

Funding

The study was supported by the National Key Research and Development Program of China (2018YFE0112300).

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Authors and Affiliations

Authors

Contributions

All authors contributed to the study conception and design. Material preparation were performed by Jili Zhang, Peng Wang and Huaiyu Long, data collection and analysis were performed by Jili Zhang, Jinfeng Ji and Xia Wu. The first draft of the manuscript was written by Jili Zhang and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.

Corresponding author

Correspondence to Peng Wang.

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Conflict of interest

The authors have no relevant financial or non-financial interests to disclose. 

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Additional information

Responsible Editor: Janusz J. Zwiazek.

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Zhang, J., Ji, J., Wang, P. et al. Molecular mechanism of negative pressure irrigation inhibiting root growth and improving water use efficiency in maize. Plant Soil 472, 127–143 (2022). https://doi.org/10.1007/s11104-021-05190-7

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  • DOI: https://doi.org/10.1007/s11104-021-05190-7

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