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In vitro function of S rnases in Lycopersicon peruvianum
1Faculty of Life Resources, Catholic University of Taegu, Kyungsan, Korea.
Molecules and Cells
|January 24, 2002
Summary
Researchers purified two S RNases from Lycopersicon peruvianum, finding they inhibit pollen growth. However, inhibitors like ZnSO4 and CuSO4 reversed this effect, suggesting a method to overcome self-incompatibility.
Area of Science:
- Plant reproductive biology
- Molecular genetics
- Biochemistry
Background:
- Gametophytic self-incompatibility (SI) is regulated by S RNases in the stylar tissue of plants like Lycopersicon peruvianum.
- Understanding the function of S RNases is crucial for controlling plant reproduction and breeding.
Purpose of the Study:
- To purify and characterize S RNases from Lycopersicon peruvianum.
- To investigate the role of S RNases in pollen growth inhibition and self-incompatibility.
Main Methods:
- Purification of S RNases (S12 and Sa) using gel filtration and cation-exchange chromatography.
- Assay of RNase activity using torula yeast rRNA.
- In vitro pollen germination tests with and without S RNases and inhibitors (ZnSO4, CuSO4).
Main Results:
- Two S RNases, S12 (21 kDa) and Sa (23.1 kDa), were purified with specific activities of 8,500 and 6,000 units/ml, respectively.
- S RNase inhibited the growth of S12Sa pollen in vitro.
- Inhibitors ZnSO4 and CuSO4 reduced S RNase activity and restored pollen germination, indicating a loss of SI ability.
Conclusions:
- S RNases likely act as inhibitors of pollen growth, playing a key role in the gametophytic self-incompatibility system.
- The inhibition of S RNase activity by specific reagents can overcome self-incompatibility in vitro, offering potential applications in plant breeding.