External hyphae of vesicular-arbuscular mycorrhizal fungi associated with Trifolium subterraneum L.. 3. Hyphal transport of 32P and 15N

1993 ◽  
Vol 124 (1) ◽  
pp. 61-68 ◽  
Author(s):  
A. JOHANSEN ◽  
I. JAKOBSEN ◽  
E. S. JENSEN
Keyword(s):  
Arbuscular Mycorrhizal Fungi ◽  
Mycorrhizal Fungi ◽  
Trifolium Subterraneum ◽  
Arbuscular Mycorrhizal ◽  
Vesicular Arbuscular Mycorrhizal Fungi ◽  
External Hyphae ◽  
Vesicular Arbuscular ◽  
Hyphal Transport

A comparison of spatial heterogeneity of vesicular–arbuscular mycorrhizal fungi in two maple-forest soils

1993 ◽  
Vol 71 (11) ◽  
pp. 1472-1480 ◽  
Author(s):  
John N. Klironomos ◽  
Peter Moutoglis ◽  
Bryce Kendrick ◽  
Paul Widden
Keyword(s):  
Arbuscular Mycorrhizal Fungi ◽  
Mycorrhizal Fungi ◽  
Sugar Maple ◽  
Root Colonization ◽  
Arbuscular Mycorrhizal ◽  
Vesicular Arbuscular Mycorrhizal Fungi ◽  
Total Length ◽  
External Hyphae ◽  
Vesicular Arbuscular ◽  
Spore Densities

The variations in the numbers of propagules and in the colonization rates of vesicular–arbuscular mycorrhizal fungi in soils of two sugar maple forests, one near Waterloo in southern Ontario, the other near Lacolle in southern Quebec, were investigated. Both forests comprised similar plant communities, and in each case the most numerous mycorrhizal spores were identified as those of Glomus macrocarpum, Glomus geosporum, and Acaulospora foveata. In both forests, root colonization and length of hyphae in soil peaked in spring and again in autumn, and spore densities were highest in autumn and gradually decreased during the rest of the year. Mean percent root colonization at Lacolle was twice as high as at Waterloo, and mean spore densities were almost 10 times higher. In contrast, average total length of hyphae in the soil was approximately 10 times higher at Waterloo than at Lacolle. Sporulation by G. macrocarpum was positively correlated with soil organic matter content, and sporulation by A. foveata was negatively correlated with increasing pH. Root colonization was not correlated with spore densities but was positively correlated with the total length of hyphae in the soil. Relationships among root colonization, production of external hyphae, and spore abundance in natural ecosystems are discussed. Key words: vesicular–arbuscular mycorrhizae, Acer saccharum, environmental influences.

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