Successfully reported this slideshow.
We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads. You can change your ad preferences anytime.
Md. Kamaruzzaman Shakil  Department of Plant PathologyBangladesh Agricultural University,           Mymensingh  I.D .No. 1...
TitleBIO - WARFARE DURING HOSTPATHOGEN INTERACTIONS IN INDIGENOUS CROP PLANTS
Introduction   Plant diseases caused by pathogenic organisms result    in significant economic losses every year. Plants ...
Objectives   To     know    about  host-pathogen    interaction.   To know about various weapons of    fungi,     bacter...
Plant pathogenA plant pathogen is a disease-causingorganism which attacks plants and causesdiseases.Types of plant pathoge...
Major pathogenic organismsFungi : Fungi are primitive plants, that are lacking in chlorophyll.Bacteria : Bacteria are mi...
   Virus:Plant viruses are pathogens which are composed mainly    of a nucleic acid (genome) normally surrounded by a pro...
Bio – warfare :Biological warfare means war in plant body against plantpathogenic organisms by using different defensiveme...
Description of various weapons Appressorium: An appressorium is a flattened, hyphal  "pressing" organ, from which a minut...
Description of various weapons Stylet: The stylet is the primitive mouth-parts of some nematodes. The stylet is adapted f...
Mechanism of penetration & host tissue           disintegration
Mechanism of penetration & host tissue                 disintegration Fungi:     Natural opening – Plants have several ty...
Mechanism of penetration & host tissue disintegrationDirect Penetration: After contact between a germ tube and theplant su...
Mechanism of penetration & host tissue           disintegration
Mechanism of penetration & host tissue              disintegration Virus: Vector is the important factor for viral diseas...
Mechanism of penetration & host tissue           disintegration            After attachment the virus              may ent...
Mechanism of penetration & host tissue           disintegration                   ABNORMAL CELLS          The cells become...
Mechanism of penetration & host tissue              disintegrationNematodes
Mechanism of penetration & host tissue           disintegration Life cycle of root-knot nematode                          ...
Mechanism of penetration & host tissue                  disintegrationProliferation of destruction by nematodes2 hr       ...
Conclusion
"Bio - Warfare During Host Pathogen Interactions in Indigenous Crop Plants" by Md. Kamaruzzaman Shakil
Upcoming SlideShare
Loading in …5
×

"Bio - Warfare During Host Pathogen Interactions in Indigenous Crop Plants" by Md. Kamaruzzaman Shakil

1,497 views

Published on

This presentation Slide was presented by me in final evaluation pf the Course.

  • Be the first to comment

"Bio - Warfare During Host Pathogen Interactions in Indigenous Crop Plants" by Md. Kamaruzzaman Shakil

  1. 1. Md. Kamaruzzaman Shakil Department of Plant PathologyBangladesh Agricultural University, Mymensingh I.D .No. 11Ag.P.Path. JJ 07 M Reg. No. 33141 Ph.- +8801722449614
  2. 2. TitleBIO - WARFARE DURING HOSTPATHOGEN INTERACTIONS IN INDIGENOUS CROP PLANTS
  3. 3. Introduction Plant diseases caused by pathogenic organisms result in significant economic losses every year. Plants represent a rich source of nutrients for many organisms including bacteria, fungi, insects, and nematodes. The infection processes by these pathogenic organisms share many common features. These include dispersal of an infectious particle, host adhesion, recognition, penetration, invasive growth, and lesion development. Human depend on plant in every aspects of life. So, Understanding how plants defend themselves from pathogens and herbivores is essential in order to protect our food supply and develop highly disease- resistant plant species.
  4. 4. Objectives To know about host-pathogen interaction. To know about various weapons of fungi, bacteria, viruses and nematodes. To study about bio-warfare and penetration mechanisms.
  5. 5. Plant pathogenA plant pathogen is a disease-causingorganism which attacks plants and causesdiseases.Types of plant pathogens Necrotrophic pathogen Biotrophic pathogen Hemibiotrophic
  6. 6. Major pathogenic organismsFungi : Fungi are primitive plants, that are lacking in chlorophyll.Bacteria : Bacteria are microscopic, single-celledprokaryotic organisms, without a defined nucleus.
  7. 7.  Virus:Plant viruses are pathogens which are composed mainly of a nucleic acid (genome) normally surrounded by a protein shell (coat). Nematode: Nematodes are small, multicellular wormlike creatures. Many live freely in the soil, but there are some species which parasitize plant roots. Fig. nematode
  8. 8. Bio – warfare :Biological warfare means war in plant body against plantpathogenic organisms by using different defensivemechanisms . Description of various weapons: Haustoria: A specialized absorbing structure of a parasitic plant, such as the rootlike outgrowth of the pathogenic fungi. Fig. haustoria
  9. 9. Description of various weapons Appressorium: An appressorium is a flattened, hyphal "pressing" organ, from which a minute infection peg grows and enters the host. Capsules : The cell capsule is a very large structure of some prokaryotic cells, such as bacterial cells. It is a well- organized layer, not easily washed off, and it can be the cause of various diseases.
  10. 10. Description of various weapons Stylet: The stylet is the primitive mouth-parts of some nematodes. The stylet is adapted for the piercing of cell walls Fig. Stylet of nematode Toxins: In many pathogens, particularly non-obligate pathogens, toxins cause the majority of damage to the host. Enzymes: Some of the pathogen Produce enzymes that break down key structural components of plant cells.
  11. 11. Mechanism of penetration & host tissue disintegration
  12. 12. Mechanism of penetration & host tissue disintegration Fungi: Natural opening – Plants have several types of natural openings utilized by fungi. The most common are stomates. Fig. Stomata wound - Damage to a plant surface may result from animal and insect activities, environmental causes (e.g. hail), and mechanical injury.
  13. 13. Mechanism of penetration & host tissue disintegrationDirect Penetration: After contact between a germ tube and theplant surface, the direct penetration of plant cells requires acombination of mechanical force and enzymatic softening of thecuticle. Fig. Direct penetration
  14. 14. Mechanism of penetration & host tissue disintegration
  15. 15. Mechanism of penetration & host tissue disintegration Virus: Vector is the important factor for viral disease. They have a special molecule called a RECEPTOR to attach to the cellular surface.
  16. 16. Mechanism of penetration & host tissue disintegration After attachment the virus may enter the cell by a process called ENDOCYTOSIS and then be released into the cytoplasm.
  17. 17. Mechanism of penetration & host tissue disintegration ABNORMAL CELLS The cells become round and enlarge and may eventually die when the new viral particles are released
  18. 18. Mechanism of penetration & host tissue disintegrationNematodes
  19. 19. Mechanism of penetration & host tissue disintegration Life cycle of root-knot nematode (~30 days) Giant cells Root tip Vascular cylinder • • ••• • • • •• •• • • • •• • • . • • ••• • •• . • •• • •• • • • •• • Adult Female Egg Infective Mass Eggs hatch juvenile Curr. Opin. Plant Biol. 6:327-333
  20. 20. Mechanism of penetration & host tissue disintegrationProliferation of destruction by nematodes2 hr 4 hr 6 hr 24 hr
  21. 21. Conclusion

×