Altered growth of Fusarium oxysporum f. sp. chrysanthemi in an in vitro dual culture system with the vesicular arbuscular mycorrhizal fungus Glomus intraradices growing on Daucus carota transformed roots

Mycorrhiza ◽  
1995 ◽  
Vol 5 (6) ◽  
pp. 431-438 ◽  
Author(s):  
M. St-Arnaud ◽  
C. Hamel ◽  
B. Vimard ◽  
M. Caron ◽  
J. A. Fortin
Keyword(s):  
Daucus Carota ◽  
Culture System ◽  
Glomus Intraradices ◽  
Arbuscular Mycorrhizal Fungus ◽  
Mycorrhizal Fungus ◽  
Arbuscular Mycorrhizal ◽  
Dual Culture ◽  
Transformed Roots ◽  
Vesicular Arbuscular

Nitrogen transfer and assimilation between the arbuscular mycorrhizal fungus Glomus intraradices Schenck & Smith and Ri T-DNA roots of Daucus carota L. in an in vitro compartmented system

2004 ◽  
Vol 50 (4) ◽  
pp. 251-260 ◽  
Author(s):  
Jean-Patrick Toussaint ◽  
Marc St-Arnaud ◽  
Christiane Charest
Keyword(s):  
Glutamine Synthetase ◽  
Daucus Carota ◽  
Glomus Intraradices ◽  
Arbuscular Mycorrhizal Fungus ◽  
Mycorrhizal Fungus ◽  
Arbuscular Mycorrhizal ◽  
Extraradical Mycelium ◽  
Daucus Carota L ◽  
Hyphal Compartment

Nitrogen metabolism was examined in monoxenic cultures of carrot roots (Daucus carota L.) colonized with the arbuscular mycorrhizal (AM) fungus Glomus intraradices Schenck & Smith. Glutamine synthetase and glutamate dehydrogenase activities were significantly increased in mycorrhizal roots for which only the extraradical mycelium had exclusive access to NH4NO3 in a distinct hyphal compartment inaccessible to the roots. This was in comparison with the water controls but was similar to the enzyme activities of non-arbuscular-mycorrhizal (non-AM) roots that had direct access to NH4NO3. In addition, glutamate dehydrogenase activity was significantly enhanced in AM roots compared with non-AM roots. Carrot roots took up 15NH4+ more efficiently than 15NO3–, and the extraradical hyphae transfered 15NH4+ to host roots from the hyphal compartment but did not transfer 15NO3–. The extraradical mycelium was shown, for the first time, to have a different glutamine synthetase monomer than roots. Our overall results highlight the active role of AM fungi in nitrogen uptake, transfer, and assimilation in their symbiotic root association.Key words: arbuscular mycorrhizal fungus, Ri T-DNA carrot roots, in vitro root-organ culture, nitrogen metabolism.

scholarly journals Micropropagated Banana Infected with Meloidogyne javanica Responds to Glomus intraradices and Phosphorus

HortScience ◽  
1997 ◽  
Vol 32 (1) ◽  
pp. 101-103 ◽  
Author(s):  
Jorge Pinochet ◽  
Carolina Fernández ◽  
María de Carmen Jaizme ◽  
Pedro Tenoury
Keyword(s):  
Glomus Intraradices ◽  
Root Colonization ◽  
Arbuscular Mycorrhizal Fungus ◽  
Mycorrhizal Fungus ◽  
Arbuscular Mycorrhizal ◽  
Meloidogyne Javanica ◽  
Root Knot Nematode ◽  
Growth And Nutrition ◽  
Vesicular Arbuscular ◽  
Low Potassium

The effects of the interaction between the vesicular-arbuscular mycorrhizal fungus Glomus intraradices Schenk and Smith and the root-knot nematode Meloidogyne javanica (Treub) Chitwood on growth and nutrition of micropropagated `Grand Naine' banana (Musa AAA) were studied under greenhouse conditions. Inoculation with G. intraradices significantly increased growth of plants in relation to nonmycorrhizal plants and was more effective than P fertilization in promoting plant development. Mycorrhizal colonization did not affect nematode buildup in the roots, although plants with the nematode and mycorrhiza were more galled. Meloidogyne javanica had no effect on the percentage of root colonization in mycorrhiza-inoculated plants. No element deficiency was detected by foliar analysis. All elements were within sufficiency levels for banana with exception of N, which was low. Potassium levels were lower in mycorrhizal plants, while Ca and Mg levels were higher with mycorrhiza than without, with or without the nematode. Early inoculation with G. intraradices appears to favor growth of banana plants by enhancing plant nutrition.

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