This book is a manual on general laboratory handling techniques in plant pathology. It will present different conditions that are essential for those who are interested in working in the field of plant pathology in a laboratory. The analysis in this book focuses on various circumstances like general requirements, laboratory equipments, sterilization techniques, the isolation of bacteria etc.
When designing a laboratory there are many aspects to consider. It is important that work should be carried out in a logical order and, that particular parts of the diagnostic protocol are separated from one another. General plant protection laboratory may have the following different rooms and chamber as appropriate. The preparation room is used for preparing media, including sterilizing items in the autoclave, sterilizing petri dishes in an oven, washing glassware and storing glassware, chemicals and other basic items.
This room should have an exhaust fan to remove hot air produced by the autoclave and the oven. The clean room is used for isolating fungi and bacteria from cleaned subsamples of diseased plant tissue into pure cultures. It is also used for growing cultures under clean conditions. The microscopes are located in this room for examining cultures and fungal structures. This room should be air-conditioned, if possible, to protect equipment and cultures. It should also be kept free from dust and insects. If, do not have an airtight clean room or humidity will be too high and fungus (mould) will develop on walls and equipment. A dehumidifier is useful in this room. No soil is allowed in the clean room as soil is a source of fungus-eating mites that can contaminate cultures.
Table of Contents
1. GENERAL REQUIREMENTS AND FACILITIES FOR A PLANT QUARANTINE LABORATORY
2. KNOWING LABORATORY EQUIPMENTS, APPLIANCES, GLASSWARE AND CHEMICALS WITH THEIR SAFE HANDLING TECHNIQUES
3. KILLING, PRESERVATION AND TRANSPORTATION TECHNIQUES FOR INSECT PESTS
4. PREPARATION OF CULTURE MEDIA FOR FUNGI AND BACTERIA
5. STERILIZATIION TECHNIQUES IN LABORATORY
6. ISOLATION OF PLANT PATHOGENIC FUNGI FROM DISEASED PLANT MATERIAL
7. ISOLATION OF PHYTO-PATHOGENIC BACTERIA FROM DISEASED PLANTS
8. ISOLATION OR EXTRACTION METHODS FOR NEMATODES FROM PLANT AND SOIL SAMPLE
9. MAINTENANCE AND STORAGE OF VIRUS ISOLATES
10. PRESERVATION OF DISEASE SAMPLES
11. PURE CULTURE MAINTENANCE OF PLANT PATHOGENS
Research Objectives and Themes
The primary objective of this manual is to provide a comprehensive guide for laboratory handling techniques essential for plant pathology diagnostics, focusing on the safe and effective management of equipment, pathogen isolation, and specimen preservation. The document serves as a standard operating procedure for research and diagnostic laboratories in plant protection.
- Infrastructure and layout requirements for diagnostic laboratories
- Procedures for killing, labeling, and preserving insect pests
- Methods for the preparation of culture media for fungi and bacteria
- Techniques for the isolation of various plant pathogens including fungi, bacteria, and nematodes
- Protocols for maintaining pure cultures and managing viral isolates
Excerpt from the Book
3.1.3. Cleaning specimens
At most time, cleaning the specimens is important for further preservation process. The soil insects and also other insects and their immatures might be unclean at the time of collection. Cleaning can be done in different ways as per quantity of dirt, size and type of specimen. A fine camel-hair brush can work for dirt, pollen dust type materials. Similar dirt can be removed in water to which synthetic detergents has been added. Specimens can be picked by fine forceps and drop at the dish containing clean water or mixed with detergents for some time. Greasy materials in the specimen have to be cleaned with the help of organic solvent. Specimen covered with mold or fungus can be removed by fine brush dipped in carbolic acid. Beetles and other hard insects can be made clean by gently scrubbing with water or weak alcohol. After cleaning specimen it can be returned to the relaxing jar.
Summary of Chapters
1. GENERAL REQUIREMENTS AND FACILITIES FOR A PLANT QUARANTINE LABORATORY: Defines the infrastructure, utility requirements, and logical layout necessary for a functional plant diagnostic laboratory.
2. KNOWING LABORATORY EQUIPMENTS, APPLIANCES, GLASSWARE AND CHEMICALS WITH THEIR SAFE HANDLING TECHNIQUES: Details the specifications, maintenance, and safe usage of essential lab apparatus, ranging from analytical balances to sterilization equipment.
3. KILLING, PRESERVATION AND TRANSPORTATION TECHNIQUES FOR INSECT PESTS: Covers systematic procedures for the collection, relaxing, pinning, and storage of insect specimens.
4. PREPARATION OF CULTURE MEDIA FOR FUNGI AND BACTERIA: Explains the classification of culture media and provides specific protocols for preparing Potato Dextrose Agar and Nutrient Agar.
5. STERILIZATIION TECHNIQUES IN LABORATORY: Outlines physical and chemical methods for maintaining aseptic conditions in the laboratory.
6. ISOLATION OF PLANT PATHOGENIC FUNGI FROM DISEASED PLANT MATERIAL: Describes the steps for surface sterilizing infected tissues and isolating fungal colonies on nutrient media.
7. ISOLATION OF PHYTO-PATHOGENIC BACTERIA FROM DISEASED PLANTS: Focuses on the serial dilution and streaking methods used to obtain pure cultures of pathogenic bacteria.
8. ISOLATION OR EXTRACTION METHODS FOR NEMATODES FROM PLANT AND SOIL SAMPLE: details various techniques for extracting soil and endoparasitic nematodes including the Baermann funnel method.
9. MAINTENANCE AND STORAGE OF VIRUS ISOLATES: Provides methods for long-term storage of viral isolates via drying, lyophilization, or liquid nitrogen.
10. PRESERVATION OF DISEASE SAMPLES: Discusses techniques for dry and wet preservation of plant disease specimens for future reference and comparison.
11. PURE CULTURE MAINTENANCE OF PLANT PATHOGENS: Details advanced techniques for sub-culturing and maintaining pure microbial populations using single-spore or hyphal tip cultures.
Keywords
Plant pathology, laboratory techniques, diagnostic laboratory, pathogen isolation, sterilization, culture media, insect preservation, nematode extraction, plant viruses, pure culture, PDA, Nutrient Agar, biocontrol, biosafety, plant quarantine.
Frequently Asked Questions
What is the primary purpose of this manual?
The manual provides standardized protocols for essential laboratory tasks in plant pathology, including equipment handling, pathogen isolation, and specimen preservation.
Which microorganisms are primarily addressed in the isolation chapters?
The manual focuses on isolating plant pathogenic fungi, phytopathogenic bacteria, and plant-parasitic nematodes.
What does the manual say about laboratory safety?
It emphasizes the necessity of labeling hazardous chemicals as "POISON," proper use of sterilization techniques, and maintaining aseptic conditions in the inoculation chambers.
Which methods are described for insect preservation?
The manual describes both dry preservation (pinning, pointing, carding) and wet preservation in alcohol or formalin.
How is the laboratory layout described for diagnostic work?
It suggests a logical separation of functions, with specific rooms or chambers for media preparation, sterilization, inoculation, and incubation to avoid cross-contamination.
What common media are described for pathogen cultivation?
The manual provides detailed instructions for the preparation of Potato Dextrose Agar (PDA) and Nutrient Agar.
Why is the "clean room" important in a plant pathology lab?
It is essential for isolating fungi and bacteria from diseased tissue and growing pure cultures under sterile, dust-free conditions.
How are nematodes extracted from soil?
The manual describes several methods, prominently the Baermann funnel method, which relies on the movement of motile nematodes through water-saturated soil/tissue samples.
- Citar trabajo
- Ritesh Yadav (Autor), 2019, Manual on general laboratory handling techniques in plant pathology, Múnich, GRIN Verlag, https://www.grin.com/document/457722
