This document discusses penetration and phenomenon of plant pathogens. It begins with introducing pathogenesis and infection. It then discusses the three phases of penetration: pre-penetration where the pathogen grows on the surface, penetration where the pathogen enters through cell walls or openings, and post-penetration where the pathogen colonizes inside the plant. It also discusses how viruses, bacteria and phytoplasmas rely on vectors like insects to infect plants since they cannot actively penetrate. The document provides an overview of the key concepts around how plant pathogens penetrate and infect plants.

1. GURU NANAK INSTITUTE OF PHARMACEUTICAL SCIENCE AND
TECHNOLOGY
TOPIC : Penetration and Phenomenon of Plant Pathogen
NAME OF THE STUDENT : DRISHTANTI
MAHAJAN
UNIVERSITY ROLL NUMBER: 31308420009
ACADEMIC SESSION : 2022-2023
PAPER NAME: PLANT PATHOLOGY
PAPER CODE: DSEBT-502B
Maulana Abul Kalam Azad University of Technology

2. INTRODUCTION
B. Sc./ SEM 5/2022-23/ /Paper name/ Paper Code/Presentation_1
❑Pathogenesis is the
process of infection or
the disease develops
in plant body.
❑Infection is the
establishment of
a pathogenic
microorganism
within the host,
following
entrance.
PRESENTATION TITLE 2

3. BODY
B. Sc./ SEM 5/2022-23/ /Paper name/ Paper Code/Presentation_1
3 PHAGES OF PENETRATION
3
• PRE- PENETRATION
✓The growth of the pathogen
before actual entry or penetration
into the host.
✓Spores of various pathogenic
fungi germinate on the surface of
the host.
• PENETRATION
➢Plant pathogens penetrate the
plant surfaces by direct
penetration of the cell walls,,
natural opening or through
wounds.
• POST-
PENETRATION
❖Phase include the
development and growth of
the pathogen after
penetration.
❖In this phage, colonization of
the pathogen takes place.

4. BODY
B. Sc. / SEM 5/2022-23/ /Paper name/ Paper Code/Presentation_1
INFECTION PHENOMENON OF PLANT
• This occur when pathogen invades the plant tissue and
establishes a parasitic relationship between itself and
the plant.
• Viruses, bacteria and phytoplasmas are not able to
actively penetrate or enter plant host tissue.
• Therefore, they must rely on other methods to infect
plant tissue and cells.
• Association with insect vectors have been established by
these pathogens to aid inoculation and dispersal.

5. SUMMARY
5
❑In this content we will be learning about Penetration and
Phenomenon of Plant Pathology.
❑We studied the definition of pathogenesis and infection.
❑ We studied about three phases of penetration of pathogenesis
in plants.
❑We studied 3 phages of penetration in details.
❑We studied about infectious phenomenon of plant pathology.

6. REFERENCE
B. Sc. / SEM 5/2022-23/ /PLANT PATHOLOGY/ DSEBT-502 B/Presentation_1
CONCLUSION
• INTRODUCTIO
N
• https://www.
slideshare.net
/nishakataria
10/phenome
non-and-
factors-of-
infection-in-
plants
• PENETRATION
• https://www.you
rarticlelibrary.co
m/biology/plant
s/3-phases-of-
penetration-of-
pathogenesis-in-
plants/23129
• PHENOMENON
• https://cropwatch.unl
.edu/soybean-
management/plant-
disease#:~:text=Infe
ction%3A,infect%20
plant%20tissues%20
and%20cells.