Saprophytic growth and Pseudothecia production by Pyrenophora tritici-repentis in plant tissue held at controlled water potentials

Mycelial growth rate and production of pseudothecia by Pyrenophora tritici-repentis in dead wheat leaves at a range of water potentials was measured. In sterilized, reinoculated leaves the fungus grew maximally at the wettest level tested (-0.5 M Pa = -5 bars) and was able to grow at a slow rate at...

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Bibliographic Details
Published in:Phytopathology 1988, Vol.78 (9), p.1205-1210
Main Authors: PFENDER, W. F, PACEY, C. A, ZHANG, W
Format: Article
Language:English
Subjects:
Biological and medical sciences
feuille
Fundamental and applied biological sciences. Psychology
Fungal plant pathogens
growth rate
hojas
indice de crecimiento
leaves
micelio
mycelium
Pathology, epidemiology, host-fungus relationships. Damages, economic importance
Phytopathology. Animal pests. Plant and forest protection
potentiel hydrique
pyrenophora
taux de croissance
tension de absorcion
triticum aestivum
water potential
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Summary:Mycelial growth rate and production of pseudothecia by Pyrenophora tritici-repentis in dead wheat leaves at a range of water potentials was measured. In sterilized, reinoculated leaves the fungus grew maximally at the wettest level tested (-0.5 M Pa = -5 bars) and was able to grow at a slow rate at -10.5 M Pa. In infected nonsterile leaves, growth rates were slower than in sterilized leaves at all water potentials, and growth was detected at -8.5, but not at -10.5 M Pa. Pseudothecia production in nonsterile leaves was equivalent to that in sterilized leaves. Production of pseudothecia was maximum at -0.5 M Pa (wettest level tested), was significantly reduced at -1.6 M Pa, and was limited to a very few, small ascocarps at -2.4 M Pa; none were produced at -3.8 M Pa.
ISSN:0031-949X
1943-7684
DOI:10.1094/Phyto-78-1205