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Light Sheet Fluorescence Microscopy of Plant Roots Growing on the Surface of a Gel
Published on: January 18, 2017
Rice develop wavy seminal roots in response to light stimulus
Shu-Jen Wang1, Chia-Hsun Ho, Hsiang-Wen Chen
1Department of Agronomy, National Taiwan University, Taipei 106, Taiwan. shujen@ntu.edu.tw
Plant Cell Reports
|May 17, 2011
Summary
Light exposure causes diverse photomorphology in rice seminal roots, particularly wavy roots in indica varieties. Auxin transport and specific oxylipins are crucial for this light-induced root waving.
Area of Science:
- Plant Biology
- Genetics
- Biochemistry
Background:
- Seminal roots are the primary root structures in germinated rice (Oryza sativa L.).
- Root photomorphology exhibits variety-specific diversity, with light-induced root waving predominantly observed in indica rice varieties.
- Light-induced root waving differs from root curling/coiling under high humidity or nitrogen conditions.
Purpose of the Study:
- To investigate the photomorphology of rice seminal roots.
- To elucidate the roles of auxin and oxylipins in light-induced wavy root development.
- To understand the genetic and molecular mechanisms underlying light-induced root waving.
Main Methods:
- Comparative analysis of seminal root photomorphology across rice varieties.
- Application of inhibitors for auxin polar transport and fatty acid oxygenation.
- Gene expression analysis using reverse transcriptase-polymerase chain reaction (RT-PCR) for fatty acid oxygenation enzymes.
Main Results:
- Light-induced root waving is dependent on the developmental stage.
- The wavy root phenotype results from asymmetric cell growth around the stele.
- Auxin polar transport is essential for light-induced wavy seminal roots.
- Ketol oxylipins, via allene oxide synthase (EC 4.2.1.92), act as intracellular signals for this phenotype.
Conclusions:
- Auxin polar transport is a key regulator of light-induced wavy root formation in rice.
- Oxylipins derived from fatty acid oxygenation play a critical role as signaling molecules in this process.
- Understanding these pathways can inform strategies for improving root architecture in rice.
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