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Ultrastructure of intercellular hyphae and haustoria of the monokaryotic stage ofPuccinia lagenophorae

Authors
Journal
Microbiological Research
0944-5013
Publisher
Elsevier
Publication Date
Volume
154
Issue
3
Identifiers
DOI: 10.1016/s0944-5013(99)80025-1
Keywords
  • Haustoria
  • Intercellular Hyphae
  • Puccinia Lagenophorae
  • Senecio Vulgaris
  • Ultrastructure

Abstract

Abstract During the aecial infection (monokaryotic stage) of Puccinia lagenophorae, the intercellular hyphae grow densely in the mesophyll and vascular tissues of Senecio vulgaris leaves. An amorphous material is deposited between intercellular hyphae and host cell wall and may act as adhesive material. Intercellular hyphae are characterized by the presence of perforate, partial and complete septa. These hyphae contain one nucleus per compartment and glycogen besides the usual organelles. This stage of infection is characterized by filamentous haustoria. A penetration peg is formed as a continuation of the haustorial mother cell. The haustoria are characterized by a narrow proximal part, which is enclosed by a thick collar and a wide distal part enclosed by a matrix (extrahaustorial matrix), which is an extension of the host cell wall and bound by an invaginated host plasma membrane (extrahaustorial membrane). The haustorium contains a single nucleus, mitochondria, ribosomes, vesicles, endoplasmic reticulum and vacuoles. The most striking feature of this stage is that intercellular hyphae and haustoria of the fungus heavily invade vascular tissue of the host leaf

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