Demonstration of Micropores in Fungal Cross-wall

Hashimoto, Tadayo; Kishi, Tomi; Yoshida, Nagayuki

doi:10.1038/2021353a0

Cited by 17 publications

(4 citation statements)

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“…It would appear that removal of the septal swelling material in the maceration process somewhat enlarges the septal pore. It will be noted that these are distinct from the micropores of Geotrichum candidum described by Hashimoto, Kishi, and Yoshida (1964) and Welsenach and Kerpel (1965). Although the morphology and general cytology are changed the dolipore structure remains unaltered in the Hartig net zone.…”

Section: Discussionmentioning

confidence: 91%

Observations on the Mycorrhizas of Forest Trees. II. The Rhizosphere of Pinus Radiata D. Don

Foster¹,

Marks²

1967

Aust. Jnl. Of Bio. Sci.

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SummaryTwo common mycorrhiza types of Pinus radiata were examined by light and electron microscopy. Large numbers of bacteria and fungal species other than those forming the mycorrhiza as well as diatoms were observed in the mycorrhizosphere. Different morphological types of bacteria were characteristic of different mycorrhizal types, and in some cases the bacteria were associated with lysed regions of the mantle. The distribution of the bacteria within the rhizosphere is discussed in relation to the clay minerals and the carbohydrate and polyphenol metabolisms of the host.Within the mantle and the Hartig net, the hyphae have a structure typical of basidiomycetes, but within the tannin layer the hyphae have an abnormal distorted appearance. This is correlated with changes in cytology and is construed as evidence of the production of polyphenols toxic to fungi.. A possible role of these polyphenols in the control of mycorrhizal associations by selective action on soil fungi entering the rhizosphere is discussed.

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Section: Discussionmentioning

confidence: 91%

Observations on the Mycorrhizas of Forest Trees. II. The Rhizosphere of Pinus Radiata D. Don

Foster¹,

Marks²

1967

Aust. Jnl. Of Bio. Sci.

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“…Among the many thousands of fungal species, plasmodesmata occur in only a few species of Geotricum, Endomyces (the perfect stage of the imperfect Geotrichum), Endomycopsis, Gilbertella, Rhizopus and the chytrids Entophlyctis and Rhizophydium (see Hashimoto, Kishi & Yoshida, 1964;Hawker & Gooday, 1967;Powell, 1974;Marchant, 1976). The plasmodesmata in Entophylyctis and Endomyces contain an appressed ER that is identical in appearance to that observed in higher plants (Fig.…”

Section: Polyphyletic Origin Of Plasmodesmata?mentioning

confidence: 84%

Plasmodesmata and the supracellular nature of plants

1993

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SUMMARY In the classical formulation of Münch (1930), plasmodesmata are considered to form simple cytoplasmic bridges between neighbouring plant cells to create the symplasm. This concept has dominated, if not monopolized, the thinking of plant biologists and in particular plant physiologists over the last few decades. Recent advances in ultrastructural, physiological and molecular studies on plasmodesmata indicate that this simple view is in need of revision. Structurally, the higher plant plasmodesma has been revealed to be a supramolecular complex consisting of membranes and proteins. Functionally, evidence is at hand that this complex structure appears to have evolved not only to control the size exclusion limit for intercellular diffusion of metabolites and small molecules, but also to potentiate and regulate intercellular trafficking of macromolecules, including proteins and nucleic acids. In this regard, plasmodesmal transport may share parallel regulatory mechanisms with nucleocytoplasmic transport. Based on these findings, we advance the hypothesis that plants function as supracellular, rather than multicellular, organisms. As such, the dynamics of the plant body, including cell differentiation, tissue formation, organogenesis and specialized physiological function(s), is subject to plasmodesmal regulation. Plasmodesmata presumably accomplish such regulatory roles by trafficking informational molecules which orchestrate both metabolic activity and gene expression. Current and future studies on the evolutionary origin(s) of plasmodesmata are likely to provide valuable information in terms of the genetic and molecular basis for the supracellular nature of plants.

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“…Normal septal pores are 50-500 /im in diameter but other smaller pores, called plasmodesmata, have been reported by Hashimoto, Kishi and Yoshida (1964) and Hawker, Gooday and Bracker (1966). These smaller pores are found in nonperforate septa of phyeomycetes and are not included in the discussion in this paper.…”

Section: Introductionmentioning

confidence: 93%

Multiperforate Septa in Lichens

Wetmore

1973

New Phytologist

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SUMMARYAscomycetes usually have only one pore in the hyphal septum. This paper reports the first observation of multiperforate septa in lichen fungi using the electron microscope. Multiperforate septa are reported in Peltigera, Peltula and Hydrothyria. The extra pores probably facilitate intercellular transport of nutrients and water within the thallus. Previous reports of multiperforate septa in other lichen genera using the light mieroscope need to be verified by electron micioscope studies.

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Demonstration of Micropores in Fungal Cross-wall

Cited by 17 publications

References 1 publication

Observations on the Mycorrhizas of Forest Trees. II. The Rhizosphere of Pinus Radiata D. Don

Observations on the Mycorrhizas of Forest Trees. II. The Rhizosphere of Pinus Radiata D. Don

Plasmodesmata and the supracellular nature of plants

Multiperforate Septa in Lichens

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