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Characterization of a rice sucrose-phosphate synthase-encoding gene
J J Valdez-Alarcón1, M Ferrando, G Salerno
1Departamento de Ingeniería Genética de Plantas, Centro de Investigación y Estudios Avanzados del I.P.N., Unidad Irapuato, Guanajuato, Argentina.
Gene
|May 8, 1996
Summary
Researchers isolated and sequenced the rice sucrose phosphate synthase (SPS) gene, sps1. They found the gene is single-copy and its expression varies with leaf development, with no activity detected in roots.
Area of Science:
- Plant Molecular Biology
- Genomics
- Biochemistry
Background:
- Sucrose phosphate synthase (SPS) is a key enzyme in sucrose biosynthesis.
- Understanding plant gene structure and expression is crucial for crop improvement.
Purpose of the Study:
- To isolate and characterize the rice sucrose phosphate synthase 1 (sps1) gene.
- To investigate the structural organization and expression patterns of the rice SPS gene.
Main Methods:
- Gene isolation and sequencing of rice sps1.
- Southern blot analysis for gene copy number determination.
- Comparative amino acid sequence analysis.
- Analysis of sps1 mRNA levels during leaf development.
Main Results:
- The rice sps1 gene comprises 13 exons and 12 introns with a long leader region and a unique promoter.
- SPS is encoded by a single-copy gene in the rice genome.
- Rice SPS shows conserved regions with homologous enzymes from other species but has a variable C-terminal region.
- sps1 mRNA levels fluctuate during leaf development and are absent in roots.
Conclusions:
- The rice sps1 gene has a distinct structural organization.
- The expression of the rice SPS gene is developmentally regulated, primarily in leaves.
- These findings provide insights into the regulation of sucrose metabolism in rice.