Describes the stages in life cycle of Puccinia

1. PUCCINIA
Kingdom : Fungi
Division : Eumycota
Sub-Division : Basidiomycotina
Order : Uredinales
Family : Pucciniaceae
Dr Renjana PK
Assistant Professor
Dept of Botany
Govt College, Kodanchery

5.  Rusts
 Obligate parasite
 Autoecoius or heteroecius
 P. graminis – Black rust/stem of wheat
Two hosts- heteroecious – Primary host & alternate host
Wheat
(Dikaryophase) Barberry
(Haplophase)

6. Uredineal
stage
Telial stage
Basidial
stage
Pycnidial/
spermagonial
Aecidial
stage
WHEAT
BARBERRY

7. UREDINEAL
STAGE
 Formed by the
germination of
aeceidiospore
on wheat
 A uredosorus
is formed
 Binucleate,
oval to round
 Reddish
brown pustles-
Red stage
 Means of
secondary
infection

9. TELIALSTAGE
 Formed by the
gradual
replacemnt of
uredosori
 Black stage,
teleutospore
 2-celled,
binucleate,
clavate
 Thick & smooth
walls
 Undergo a
period of rest
 The 2 nuclei
fuse to form a
diploid nucleus

13. BASIDIAL
STAGE
 Germination of teleutospore
 Promycelium becomes the
basidium
 4 basidiospores by meiosis
 Germinates on Barberry
 Forms the haplomycelium
 Produces pycnidium on
stage on upper side &
aecidium on lower side

14. PYCNIDIAL/SPERMA
GONIAL
STAGE
 Flask shaped
pycnidium/spermagoniu
m on the upperside
 Ostiole & periphyses
 Palisade like spermatial
hyphae
 Non moile single celled
spermatia
 Long receptive hyphae
 Transfer of spermatium
of one strain to receptive
hyphae of another strain
 A binucleate cell is
formed

17. AECIDIAL
STAGE
 Dikaryotic mycelium
organises cup shaped
structures
 Lower side, peridium
(wall)
 Aecidiospores in
basipetal succession
 Intercalary cells
 Binucleate, thick walled
 Sub globose to polyhedral
 Liberated aecidiospores
germinate on wheat plants