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Expression and Accumulation Patterns of Nitrogen-Responsive Lipoxygenase in Soybeans
H. D. Grimes1, T. J. Tranbarger, V. R. Franceschi
1Department of Botany, Washington State University, Pullman, Washington 99164-4238.
Plant Physiology
|October 1, 1993
Summary
Nitrogen levels and forms affect soybean lipoxygenase (LOX-NR) gene expression and protein accumulation. LOX-NR accumulates even in nitrogen deficiency, suggesting roles beyond temporary amino acid storage.
Area of Science:
- Plant Molecular Biology
- Plant Physiology
- Biochemistry
Background:
- Lipoxygenase (LOX) proteins are involved in plant defense and development.
- Nitrogen metabolism is crucial for plant growth and protein synthesis.
- Vegetative storage proteins play roles in nutrient remobilization.
Purpose of the Study:
- To investigate the gene expression and protein accumulation of nitrogen-responsive lipoxygenase (LOX-NR) in soybeans.
- To determine how different nitrogen forms and levels influence LOX-NR.
- To explore the potential role of LOX-NR in nitrogen metabolism and storage.
Main Methods:
- Soybean plants (Glycine max cv Wye) were grown under varying nitrogen conditions (0-16 mM) and nitrogen forms (NH4NO3, NH4+, NO3-, urea).
- mRNA levels of LOX-NR were analyzed using gene expression techniques.
- Protein accumulation of LOX-NR was quantified in various plant tissues (shoot tips, stems, pod walls, leaves) throughout the plant life cycle.
Main Results:
- The form of available nitrogen significantly influenced LOX-NR mRNA levels and protein accumulation.
- A general correlation was observed between increasing available nitrogen and LOX-NR levels in shoot tips and other organs.
- Significant LOX-NR mRNA and protein accumulated even under nitrogen-deficient conditions.
Conclusions:
- LOX-NR expression and accumulation are responsive to nitrogen availability and form in soybeans.
- LOX-NR may function as a temporary amino acid storage site, particularly in developing shoot tips.
- The accumulation of LOX-NR under nitrogen deficiency suggests it may have functions beyond simple amino acid storage.
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