Related Experiment Videos
Two S-adenosylmethionine synthetase-encoding genes differentially expressed during adventitious root development in
A M Lindroth1, P Saarikoski, G Flygh
1Department of Forest Genetics, Swedish University of Agricultural Sciences, Uppsala. lindroth@ucla.edu
Plant Molecular Biology
|August 8, 2001
Summary
Two S-adenosylmethionine synthetase (SAMS) genes in Pinus contorta show distinct root development expression patterns. PcSAMS1 is crucial for adventitious root initiation, while PcSAMS2 is downregulated during this process.
Area of Science:
- Plant molecular biology
- Biochemistry
- Gene expression analysis
Background:
- S-adenosylmethionine synthetase (SAMS) is vital for plant growth and development.
- Understanding SAMS gene regulation is key to manipulating plant development, particularly root formation.
Purpose of the Study:
- To identify and characterize SAMS cDNAs in Pinus contorta.
- To investigate the differential expression of SAMS genes during root development.
- To explore the functional roles and evolutionary divergence of PcSAMS1 and PcSAMS2.
Main Methods:
- cDNA cloning and sequencing.
- Quantitative gene expression analysis (e.g., RT-qPCR).
- Functional complementation in Saccharomyces cerevisiae.
Main Results:
- Two distinct SAMS cDNAs, PcSAMS1 and PcSAMS2, were identified in Pinus contorta.
- PcSAMS1 shows preferential root expression and specific meristematic activity during adventitious root development.
- PcSAMS2 is expressed in both roots and shoots but downregulated during adventitious root formation, with its activity differing from transcript levels.
- PcSAMS1 exhibits significant divergence from other plant SAMS but retains functionality, while PcSAMS2 is highly conserved among eukaryotic SAMS.
Conclusions:
- PcSAMS1 and PcSAMS2 play distinct roles in Pinus contorta root development.
- Post-transcriptional regulation or other uncharacterized SAMS genes likely influence overall SAMS activity.
- PcSAMS1 represents a highly divergent, yet functional, SAMS enzyme in plants.