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[Cloning and characterization of CMO gene from Atriplex hortensis]
1Laboratory of Plant Biotechnology, Institute of Genetics, Chinese Academy of Sciences, Beijing 100101, China.
Summary
Researchers isolated and characterized the choline monooxygenase (CMO) gene from the halophyte Atriplex hortensis. Transgenic tobacco plants expressing this gene exhibited enhanced salt and drought tolerance, demonstrating its potential for improving crop resilience.
Area of Science:
- Plant molecular biology
- Biochemistry
- Stress physiology
Context:
- Glycine betaine is a crucial osmoprotectant in plants, synthesized through a two-step process.
- The first step, catalyzed by choline monooxygenase (CMO), is rate-limiting.
- Understanding CMO function is key to enhancing plant stress tolerance.
Purpose:
- To isolate and characterize the choline monooxygenase (CMO) gene from the halophyte Atriplex hortensis (AhCMO).
- To investigate the expression pattern of AhCMO under salt stress.
- To assess the function of AhCMO by expressing it in a heterologous system (tobacco).
Summary:
- A 1.77 kb cDNA clone encoding AhCMO was isolated from a salt stress-induced library of Atriplex hortensis.
- The deduced amino acid sequence showed high homology to spinach and sugar beet CMO, with conserved functional motifs.
- AhCMO expression increased threefold under salt stress, and transgenic tobacco plants showed improved salt and drought tolerance.
Impact:
- This study identifies a key gene involved in glycine betaine synthesis and plant stress tolerance.
- The findings provide a basis for genetic engineering of crops to withstand abiotic stresses like salinity and drought.
- AhCMO represents a potential target for developing more resilient agricultural systems.