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Unformatted text preview: CLASSIFICATION: Kingdom: Mycota
Basidiomycotina Class: Teliomycetes
Genus: Puccinia Species : graminis
The genus includes about 3000
species of these 147 has been
reported from India.
It causes a rust disease - black
stem rust of Wheat.
stem Puccinia graminis is an obligate
parasite. It is a heterocious parasite.
It It’s life cycle on Wheat and on
Barberry. Wheat is a primary host. Barberry
Barberry is a secondary or
alternate Spore-producing stages (0, I, II,
III, IV) in their life cycles.
III, Puccinia graminis 0 and I on
barberry bushes (Berberis
vulgaris: dicot) II and III on various grasses
(monocot) IV on soil. Acediospores geminates on
Wheat stem or leaf to form
filamentous well developed,
mycelium. Dikaryophase Reproduction:
On Wheat Puccinia reproduces by
The spores are of two kinds:
(i) Uridiospores (2N)
(ii) Telutospores (2N)
(iii) Basidio spores Each cell contains a pair
of nuclei (n + n)
constituting a dikaryon.
To obtain nutrition
haplophase phase develop
haustoria. Uredineal Stage:
Uredineal The hyphae of the dikaryotic
mycelium - aggregate near
the surface of the infected
organ to form a hyphal mass
known as Ureida.
known The tip of each hyphae swells to
form a single binucleate oval
uredospore formed in a group.
uredinium or uredosorus.
uredinium They exert pressure on the
epidermis, finally ruptured in
form of slits through which rusty
coloured Uredospores are seen.
coloured Uredospore Mycelium Puccinia Uredosporangium Puccinia
rusty red in
colour. Telial Stage:
Uredospores are metamorphoses
into Telutospores in the same
Uredosori. Uredosori is known as Telutosori. Telutospores are dark brown or
black in colour.
black Stage III: Telia bearing
teliospores Puccinia Teluto
sporangium Telutospores Telutospores
Dark brown or
black in colour.
The wall is thick,
smooth. Puccinia teluto
•Each cell has two nuclei (one plus strain
and the other of minus strain).
•final stage on primary host
•Telutospore matures, the nuclei in each
cell fuse to form a diploid nucleus
(Kayogamy) (2N). Germination of Teluto spore
On Soil Favourable condition- Proper
Temperature, Germination of Teluto sporeGermination
germination tube - Epibasidium Germination of Teliospore
Germination tube Germinated Teluto spore and formation
of Basidium & Basidio spores
Sterigmata Basidio spore
(+) Or (-)
Hypobasidium Basidium Basidiospores
(+ and -)
upper epidermis of
Barberry leaf and
Pycniosporangium Stages of Puccinia on
Pycniospores stage: On upper
epidermis with +ve and – ve
basidiospores (Sexual reproduction)
(Plasmogamy) Aecidiospore stage: On lower
epidermis, Binucleate Aecidiospore
epidermis, Infection of Puccinia on Barberry
leaf Lower and Upper sides
leaf Puccinia Pycnium on Upper
epidermis Receptive hyphae and Spermatia
Spermatia Receptive hyphae DevelopDevelopment of
orangium Stage I: Aecia bearing
aeciospores (n+n) •Puccinia- Aecio sporangium on lower
epidermis aeciospores infect primary host.
Aeciospores produced on alternate host
(e.g.,Barberry) infect primary host (e.g.,
grasses) AeciosporesAeciosporesround, yellowish
walled, 6 germ
pores. Germinate on
wheat Aecidiosporangium Aeciospores Puccinia- Polymorphic
fungi Polymorphism: Various types of
spores produced during life cycle
according to hosts life cycle and
climatic Known as Polymorphism. Fungi shows polymorphism known
as Polymorphic fungi.
as Puccinia Life Cycle Puccinia life cycle
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This note was uploaded on 11/23/2011 for the course BIO 100 taught by Professor Robinson during the Fall '08 term at BYU.
- Fall '08