The infection process of Fusarium oxysporum in cotton root tips

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1995
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Rodríguez Gálvez, Edgar Raymundo
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Protoplasma. 1995, 189(1-2), pp. 61-72. ISSN 0033-183X. eISSN 1615-6102. Available under: doi: 10.1007/BF01280291
Zusammenfassung

Conidia of Fusarium oxysporum f. sp. vasinfectum started to germinate on the roots of cotton (Gossypium barbadense L.) 6 h after inoculation and formed a compact mycelium covering the root surface. 18 h later, penetration hyphae branched off and infected the root. The number of penetration hyphae increased with the number of conidia used for inoculation. The optimal temperature for penetration was between 28 and 30° The highest numbers of penetration hyphae were found in the meristematic zone, 40 percent less in the elongation and root hair zones, and none in the lateral root zone. The fine structure of the infection process was studied in protodermal cells of the meristematic zone and in rhizodermal cells of the elongation zone. The penetration hyphae were well preserved after freeze substitution and showed a Golgi equivalent consisting of three populations of smooth cisternae. Plant reactions were found already during fungal growth on the root surface. In the meristematic zone, a thickening of the plant cell wall due to an apposition of dark and lightly staining material below the hyphae occurred. This wall apposition increased in size around the hypha invading the plant cell and led to the formation of a prominent wall apposition with finger-like projections into the host cytoplasm. In the elongation zone, the deposits around the penetration hypha appeared less thick and the dark inclusions were less pronounced. High pressure freezing of infected cells revealed, that F. oxysporum penetrates and grows within the host cells without inducing damages such as plasmolysis, cell degeneration or even host necrosis. We suggest that F. oxysporum has an endophytic or biotrophie phase during colonization of the root tips.

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Fachgebiet (DDC)
570 Biowissenschaften, Biologie
Schlagwörter
Fusarium oxysporum, Cotton roots, Penetration hyphae, Golgi equivalent, Cell wall apposition, High pressure freezing
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ISO 690RODRÍGUEZ GÁLVEZ, Edgar Raymundo, Kurt MENDGEN, 1995. The infection process of Fusarium oxysporum in cotton root tips. In: Protoplasma. 1995, 189(1-2), pp. 61-72. ISSN 0033-183X. eISSN 1615-6102. Available under: doi: 10.1007/BF01280291
BibTex
@article{RodriguezGalvez1995infec-6663,
  year={1995},
  doi={10.1007/BF01280291},
  title={The infection process of Fusarium oxysporum in cotton root tips},
  number={1-2},
  volume={189},
  issn={0033-183X},
  journal={Protoplasma},
  pages={61--72},
  author={Rodríguez Gálvez, Edgar Raymundo and Mendgen, Kurt}
}
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    <dcterms:abstract xml:lang="eng">Conidia of Fusarium oxysporum f. sp. vasinfectum started to germinate on the roots of cotton (Gossypium barbadense L.) 6 h after inoculation and formed a compact mycelium covering the root surface. 18 h later, penetration hyphae branched off and infected the root. The number of penetration hyphae increased with the number of conidia used for inoculation. The optimal temperature for penetration was between 28 and 30° The highest numbers of penetration hyphae were found in the meristematic zone, 40 percent less in the elongation and root hair zones, and none in the lateral root zone. The fine structure of the infection process was studied in protodermal cells of the meristematic zone and in rhizodermal cells of the elongation zone. The penetration hyphae were well preserved after freeze substitution and showed a Golgi equivalent consisting of three populations of smooth cisternae. Plant reactions were found already during fungal growth on the root surface. In the meristematic zone, a thickening of the plant cell wall due to an apposition of dark and lightly staining material below the hyphae occurred. This wall apposition increased in size around the hypha invading the plant cell and led to the formation of a prominent wall apposition with finger-like projections into the host cytoplasm. In the elongation zone, the deposits around the penetration hypha appeared less thick and the dark inclusions were less pronounced. High pressure freezing of infected cells revealed, that F. oxysporum penetrates and grows within the host cells without inducing damages such as plasmolysis, cell degeneration or even host necrosis. We suggest that F. oxysporum has an endophytic or biotrophie phase during colonization of the root tips.</dcterms:abstract>
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