Development of extraradical mycelium of Scutellospora reticulata under root-organ culture: spore production and function of auxiliary cells.
Identifieur interne : 003764 ( Main/Corpus ); précédent : 003763; suivant : 003765Development of extraradical mycelium of Scutellospora reticulata under root-organ culture: spore production and function of auxiliary cells.
Auteurs : Stéphane Declerck ; Dimitri D'Or ; Céline Bivort ; Francisco A. De SouzaSource :
- Mycological research [ 0953-7562 ] ; 2004.
English descriptors
- KwdEn :
- MESH :
- growth & development : Mycelium, Mycorrhizae, Plant Roots.
- microbiology : Plant Roots.
- physiology : Spores, Fungal.
Abstract
The development of the extraradical mycelium and auxiliary cells and spore production of Scutellospora reticulata in association with Ri T-DNA transformed carrot roots was followed under root-organ culture conditions. Extraradical mycelium development followed classical lag-exponential-plateau phases, with an additional late decline phase in number of auxiliary cells. Spore production started in parallel with a critical extraradical mycelium biomass produced, continued long after root growth ceased and during the late decline in auxiliary cells number. Isolated auxiliary cells were shown to exhibit hyphal re-growth, but not root colonization, either in situ or in vitro. These results showed that root and extraradical mycelium development were intimately associated in a sequence where both grew together during active root growth, followed during root aging by a period in which only the fungus developed. Spore production appeared dependent on a critical extraradical mycelium biomass and on the re-allocation of resources from both the intraradical mycelium and the auxiliary cells via the hyphal network.
DOI: 10.1017/s0953756203008761
PubMed: 15035509
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pubmed:15035509Le document en format XML
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Extraradical mycelium development followed classical lag-exponential-plateau phases, with an additional late decline phase in number of auxiliary cells. Spore production started in parallel with a critical extraradical mycelium biomass produced, continued long after root growth ceased and during the late decline in auxiliary cells number. Isolated auxiliary cells were shown to exhibit hyphal re-growth, but not root colonization, either in situ or in vitro. These results showed that root and extraradical mycelium development were intimately associated in a sequence where both grew together during active root growth, followed during root aging by a period in which only the fungus developed. 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Extraradical mycelium development followed classical lag-exponential-plateau phases, with an additional late decline phase in number of auxiliary cells. Spore production started in parallel with a critical extraradical mycelium biomass produced, continued long after root growth ceased and during the late decline in auxiliary cells number. Isolated auxiliary cells were shown to exhibit hyphal re-growth, but not root colonization, either in situ or in vitro. These results showed that root and extraradical mycelium development were intimately associated in a sequence where both grew together during active root growth, followed during root aging by a period in which only the fungus developed. 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