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Experimental Design for Laser Microdissection RNA-Seq: Lessons from an Analysis of Maize Leaf Development
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Leaflet initiation and blade expansion are separable in compound leaf development.
Fei Du1, Yajin Mo1,2, Alon Israeli3
1State Key Laboratory of Plant Genomics and National Center for Plant Gene Research (Beijing), Institute of Genetics and Developmental Biology, The Innovative Academy of Seed Design, Chinese Academy of Sciences, Beijing, 100101, China.
The Plant Journal : for Cell and Molecular Biology
|September 5, 2020
Summary
Tomato WUSCHEL-RELATED HOMEOBOX gene SlLAM1 is crucial for leaflet blade expansion, not initiation. Leaflet initiation and blade expansion can occur independently during compound leaf development.
Keywords:
Solanum lycopersicumSlLAM1SlWOX1auxinblastozonecompound leafflower developmentleaf meristemtomatoMore Related Videos
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Area of Science:
- Plant developmental biology
- Molecular genetics
- Leaf morphogenesis
Background:
- Compound leaves develop from leaflets, with auxin influencing initiation and expansion.
- Interactions between leaflet initiation and blade expansion in compound leaves remain unclear.
- Tomato (Solanum lycopersicum) offers a model for studying compound leaf complexity.
Purpose of the Study:
- Investigate the role of the WUSCHEL-RELATED HOMEOBOX (WOX) gene SlLAM1 in tomato leaf development.
- Determine how SlLAM1 interacts with auxin signaling pathways to control leaf form.
- Clarify the relationship between leaflet initiation and blade expansion.
Main Methods:
- Analysis of SlLAM1 gene expression patterns in tomato leaves.
- Characterization of SlLAM1 loss-of-function mutants (sllam1).
- Genetic interaction studies between SlLAM1 and auxin signaling components.
Main Results:
- SlLAM1 is expressed in leaf domains and essential for leaflet blade expansion.
- sllam1 mutants exhibit delayed leaflet initiation and altered leaflet arrangement but similar leaflet numbers.
- SlLAM1 shows an epistatic effect over auxin signaling in determining leaf morphology.
- SlLAM1 also impacts floral organ growth and gametophyte fertility.
Conclusions:
- SlLAM1 plays a conserved role in promoting blade expansion across different leaf types.
- Leaflet initiation and blade expansion are separable processes during compound leaf development.
- SlLAM1 is a key regulator integrating developmental signals for leaf and floral organ growth.