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Staining plant cells with silver. III. The mechanism
L Herickhoff1, S Stack, J Robertson
1Department of Biology, Colorado State University, Fort Collins 80523.
Summary
Differential silver staining intensity is linked to protein side groups. This study shows salt-nylon (SN) silver staining of onion root tips relies on tyrosine hydroxyl groups, revealing a staining mechanism.
Area of Science:
- Cytology
- Biochemistry
- Plant Science
Background:
- Differential silver staining is used in cytology, but its chemical basis is not fully understood.
- Variations in staining intensity suggest differences in protein side groups reacting with silver, such as amine, carboxyl, phosphate, sulfhydryl, and hydroxyl moieties.
Purpose of the Study:
- To investigate the specific chemical groups involved in salt-nylon (SN) silver staining.
- To elucidate the mechanism behind differential silver staining in cytological preparations.
Main Methods:
- Onion root tip squashes were subjected to salt-nylon (SN) silver staining.
- Analysis focused on identifying the chemical groups responsible for the staining reaction.
Main Results:
- The study found that salt-nylon (SN) silver staining intensity is not uniform across all cytological structures.
- Results indicate a primary dependence on the presence of tyrosine hydroxyl groups for SN silver staining.
Conclusions:
- Tyrosine hydroxyl groups are the key chemical moieties involved in salt-nylon (SN) silver staining.
- A proposed mechanism for SN silver staining based on these findings provides insight into differential staining processes.