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Raffinose positively regulates maize drought tolerance by reducing leaf transpiration
Ying Liu1,2, Tao Li1,2,3, Chunxia Zhang1,2
1State Key Laboratory of Crop Stress Biology for Arid Areas, College of Life Sciences, Northwest A&F University, Yangling, Shaanxi, 712100, China.
The Plant Journal : for Cell and Molecular Biology
|January 27, 2023
Summary
Increasing raffinose production in maize leaves enhances drought tolerance. Overexpressing the ZmRAFS gene boosts raffinose, reduces water loss, and improves plant survival under drought without impacting growth.
Area of Science:
- Plant Biology
- Biochemistry
- Genetics
Background:
- Drought stress significantly limits global crop production.
- Raffinose, a trisaccharide, is proposed to enhance plant drought tolerance, but direct evidence is lacking.
- The precise biochemical mechanism of raffinose in mitigating drought stress is unknown.
Purpose of the Study:
- To investigate the role of raffinose in maize drought stress tolerance.
- To determine if augmenting raffinose production enhances plant resilience to drought.
- To elucidate the biochemical pathway involving raffinose in drought mitigation.
Main Methods:
- Overexpression of the Zea mays RAFFINOSE SYNTHASE (ZmRAFS) gene in maize.
- Analysis of raffinose content, water loss, and biomass under optimal and drought conditions.
- Characterization of ZmRAFS mutant lines to assess raffinose-deficient phenotypes.
Main Results:
- ZmRAFS overexpression increased raffinose levels, reduced leaf water loss, and enhanced drought tolerance in maize.
- Biomass of overexpressing plants was comparable to controls under normal conditions but superior under drought.
- ZmRAFS mutants showed increased water loss, partially rescued by exogenous raffinose, with no changes in stomatal traits.
Conclusions:
- Overexpression of ZmRAFS in maize enhances leaf water retention and drought tolerance.
- Increased raffinose accumulation confers significant drought resilience without a growth penalty.
- This study provides direct evidence for raffinose's role in mitigating plant drought stress.
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