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Rice cycles between drought and well-watered-adapted phenotypes by changing lateral root formation
Helena Bochmann1,2, Marie Klein1, Amelia Henry3
1Institute of Bio- and Geosciences, IBG-2: Plant Sciences, Forschungszentrum Jülich GmbH, 52425 Jülich, Germany.
Annals of Botany
|August 12, 2025
Summary
Rice lines show varying drought recovery abilities.
Area of Science:
- Plant genetics and physiology
- Agricultural science
- Drought stress research
Background:
- Rainfed agriculture faces intermittent drought and moisture fluctuations.
- Understanding genetic variation in rice (Oryza sativa) for drought recovery is crucial.
- Root-to-shoot growth responses to wet-drought-wet cycles require detailed investigation.
Purpose of the Study:
- Investigate genetic variation in rice root-to-shoot growth under fluctuating moisture.
- Identify rice lines with distinct drought recovery capabilities.
- Focus on detailed root trait analysis for drought resilience.
Main Methods:
- Screened 100 rice accessions under fluctuating moisture for genome-wide association study (GWAS).
- Calculated a Water Recovery Index using crown root number and leaf length in 20 genotypes.
- Conducted greenhouse experiments on contrasting lines to resolve root phenotypes under drought and re-watering.
Main Results:
- GWAS identified drought recovery-associated loci with candidate genes for abiotic stress.
- Crown root growth was most affected by drought-to-re-watering transition.
- Rice line 'ARC 18202' exhibited superior drought tolerance and recovery compared to 'ADT 12', with differences in lateral root formation.
Conclusions:
- In-depth root phenotyping confirmed 'ARC 18202's drought resistance and recovery.
- S-type and L-type lateral root formation under well-watered conditions influences drought response.
- 'ARC 18202's pre-existing thick lateral roots contributed to its resilience.
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