scholarly journals The nucleolus of wheat stem rust uredospores

1969 ◽  
Vol 47 (12) ◽  
pp. 1887-1889 ◽  
Author(s):  
Stephen Mitchell ◽  
Michael Shaw
Keyword(s):  
Electron Microscopy ◽  
Ribosomal Rna ◽  
Stem Rust ◽  
Ribonucleic Acid ◽  
Acid Formation ◽  
Puccinia Graminis ◽  
Wheat Stem Rust ◽  
Puccinia Graminis Tritici ◽  
Mean Diameter

Electron microscopy shows that the nuclei in immature uredospores of Puccinia graminis tritici possess prominent nucleoli with a mean diameter of 1.7 ± 0.4 μ. The nucleoli in mature uredospores are much smaller (0.5 μ). This reduction in size of the nucleoli may indicate that ribosomal RNA (ribonucleic acid) formation is repressed as uredospores mature.

The Constitution of a Glucomannan from Wheat Stem Rust (Puccinia graminis tritici) Urediospores1

1959 ◽  
Vol 81 (3) ◽  
pp. 684-688 ◽  
Author(s):  
N. Prentice ◽  
L. S. Cuendet ◽  
W. F. Geddes ◽  
F. Smith
Keyword(s):  
Stem Rust ◽  
Puccinia Graminis ◽  
Wheat Stem Rust ◽  
Puccinia Graminis Tritici

FORMATION OF TREHALOSE AND POLYOLS BY WHEAT STEM RUST (PUCCINIA GRAMINIS TRITICI) UREDOSPORES

1962 ◽  
Vol 40 (1) ◽  
pp. 1248-1251 ◽  
Author(s):  
H. J. Reisener ◽  
H. R. Goldschmid ◽  
G. A. Ledingham ◽  
A. S. Perlin
Keyword(s):  
Stem Rust ◽  
Puccinia Graminis ◽  
Wheat Stem Rust ◽  
Puccinia Graminis Tritici

Null

scholarly journals Chemical Composition of Uredospores of Wheat Stem Rust (Puccinia graminis tritici)

Nature ◽  
1954 ◽  
Vol 174 (4442) ◽  
pp. 1151-1151 ◽  
Author(s):  
NEVILLE PRENTICE ◽  
L. S. CUENDET
Keyword(s):  
Chemical Composition ◽  
Stem Rust ◽  
Puccinia Graminis ◽  
Wheat Stem Rust ◽  
Puccinia Graminis Tritici

Electron microscopy of susceptible and resistant near-isogenic (sr6/Sr6) lines of wheat infected by Puccinia graminis tritici. III. Ultrastructure of incompatible interact

1979 ◽  
Vol 57 (23) ◽  
pp. 2626-2634 ◽  
Author(s):  
D. E. Harder ◽  
D. J. Samborski ◽  
R. Rohringer ◽  
S. R. Rimmer ◽  
W. K. Kim ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Stem Rust ◽  
Stem Rust Resistance ◽  
Temperature Sensitive ◽  
Puccinia Graminis ◽  
Cell Necrosis ◽  
Mitochondrial Membranes ◽  
Wheat Stem Rust ◽  
Mesophyll Cells ◽  
Mother Cells

The interaction between avirulent wheat stem rust and wheat mesophyll cells containing the temperature-sensitive Sr6 gene for stem rust resistance was studied by electron microscopy. Mesophyll cells that were invaded at 26 °C (conditioning compatibility) did not develop any signs of incompatibility after they were transferred to 19 °C, at which temperature incompatibility is normally expressed. In host tissue that appeared to be invaded after the change from 26 to 19 °C, the early ultrastructural symptoms of incompatibility were a more electron-dense and often perforated invaginated host plasmalemma, disruptions of the noninvaginated host plasmalemma, vacuolation of the cytoplasm, and accumulations of electron-dense material along the membranes of the vacuoles. At later stages in the development of incompatible interactions, the electron-dense accumulations along the vacuole membranes increased in size and occurred along chloroplast and mitochondrial membranes. Eventually, the entire protoplasts were electron dense and collapsed. In haustoria and haustorial mother cells, incompatibility was usually expressed by a uniform increase in electron density of the cytoplasm. In the Sr6/P6 interaction at 19 °C, host cell necrosis was not always accompanied by fungal necrosis or vice versa. In Sr5/P5 interactions, which were examined for comparison, the intracellular symptoms of incompatibility were similar to those of the Sr6/P6 interactions.

Nucleoli in differentiated germ tubes of wheat rust uredospores

1970 ◽  
Vol 48 (9) ◽  
pp. 1693-1695 ◽  
Author(s):  
Larry D. Dunkle ◽  
William P. Wergin ◽  
Paul J. Allen
Keyword(s):  
Electron Microscopy ◽  
Heat Shock ◽  
Nuclear Envelope ◽  
Outer Membrane ◽  
Ribosomal Rna ◽  
Stem Rust ◽  
Wheat Stem Rust ◽  
Cytoplasmic Structures ◽  
Germ Tubes ◽  
Wheat Rust

Nucleoli observed by electron microscopy are illustrated in germ tubes of wheat stem rust uredospores which have been induced by heat shock to differentiate infection structures. The presence of nucleoli in these structures suggests that this obligate parasite may possess the capacity of synthesizing ribosomal RNA independently of its host. In addition to nucleoli, heterochromatin is characteristically observed appressed to the inner membrane of the nuclear envelope. This material is associated with distinct cytoplasmic structures which are appressed to the outer membrane of the nuclear envelope and resemble developing centrioles in other fungi.

scholarly journals Physiologic Differentiation of Wheat Stem Rust on Rye

1978 ◽  
Vol 31 (5) ◽  
pp. 545 ◽  
Author(s):  
NH Luig ◽  
BH Tan
Keyword(s):  
Secale Cereale ◽  
Stem Rust ◽  
Puccinia Graminis ◽  
Wheat Stem Rust ◽  
Puccinia Graminis Tritici

Five self-fertile lines of Secale cereale possessing single genes conferring resistance to stem rust were successfully used to differentiate between strains of Puccinia graminis tritici. In an earlier study four of these lines were shown to differentiate between Australian cultures of P. graminis secalis. Gene H transferred from Wrens-5 rye to one of the five lines appears to be identical with gene Sr27 in Acosta's wheat-Imperial rye translocation stock WRT 238.5.

FORMATION OF TREHALOSE AND POLYOLS BY WHEAT STEM RUST (PUCCINIA GRAMINIS TRITICI) UREDOSPORES

1962 ◽  
Vol 40 (9) ◽  
pp. 1248-1251 ◽  
Author(s):  
H. J. Reisener ◽  
H. R. Goldschmid ◽  
G. A. Ledingham ◽  
A. S. Perlin
Keyword(s):  
Stem Rust ◽  
Puccinia Graminis ◽  
Wheat Stem Rust ◽  
Puccinia Graminis Tritici
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