Factors influencing the occurrence of vesicular-arbuscular mycorrhizas

Abbott, Lynette K.; Robson, A. D.

doi:10.1016/0167-8809(91)90048-3

Cited by 301 publications

(187 citation statements)

References 160 publications

Supporting

Mentioning

154

Contrasting

Unclassified

Order By: Relevance

“…Spores of AM fungi were concentrated mostly in the soil surface layer (0-10 cm), which supports the view that spore production is at a maximum near the soil surface (Abbott and Robson, 1991;Ingleby et al, 1997). Though the spore numbers were not related to AM fungal colonization levels when all the forest types were considered together; significant relationships emerged when the forest types were considered separately (primary forest: r = 0.35; P < 0.002, secondary forest: r = 0.41; P < 0.001 and limestone forest: r = 0.49; P < 0.001, n = 40).…”

Section: Spore Numberssupporting

confidence: 64%

“…A decrease in AM colonization levels and root length with AM fungal structures is consistent with the view that mycorrhizal colonization decreases with depth (Abbott and Robson, 1991). However, this contradicts the results of Ingleby et al (1997), which failed to detect any decrease in mycorrhizal colonization levels with increasing soil depth in a legume tree plantation in Senegal.…”

Section: Mycorrhizal Colonizationcontrasting

confidence: 52%

“…It is well-known that land disturbance may decrease fungal communities (Allen et al, 1998) or affect mycorrhizal propagules (Fischer et al, 1994). These few studies do indicate a fungal succession in which some species of AM fungi persist and dominate presumably due to their ability to tolerate various soil conditions (Abbott and Robson, 1991).…”

Section: Mycorrhizal Colonizationmentioning

confidence: 99%

See 2 more Smart Citations

Distribution of roots and arbuscular mycorrhizal associations in tropical forest types of Xishuangbanna, southwest China

Muthukumar

Sha

Yang

et al. 2003

Applied Soil Ecology

View full text Add to dashboard Cite

Root distribution and mycorrhizal associations were compared in primary, secondary and limestone forests in Xishuangbanna, southwest China. Soil cores to a depth of 20 cm were collected at random points from four 50 m 2 quadrats in each forest type. Arbuscular mycorrhizal (AM) associations were the only form of mycorrhiza found in all forest types. The primary forest was characterized by high root mass, root lengths and AM colonization levels higher than other forest types. In contrast, secondary forests had greater AM fungal spore numbers and specific root length, indicating that plant species in secondary forests achieved a greater degree of soil exploration with less biomass allocation to roots. Root density, AM colonization and AM fungal spore numbers decreased with soil depth in all forest types. Although the correlation between AM colonization levels and spore numbers was insignificant when all forest types were considered together, significant relationships emerged when each forest type was considered individually. AM colonization and spore numbers were correlated with several root variables.

show abstract

Section: Spore Numberssupporting

confidence: 64%

Section: Mycorrhizal Colonizationcontrasting

confidence: 52%

Section: Mycorrhizal Colonizationmentioning

confidence: 99%

See 1 more Smart Citation

Distribution of roots and arbuscular mycorrhizal associations in tropical forest types of Xishuangbanna, southwest China

Muthukumar

Sha

Yang

et al. 2003

Applied Soil Ecology

View full text Add to dashboard Cite

show abstract

“…It is possible that shorter hyphae require less C to construct, and thus represent a smaller cost to the host plant. Alternately, the differences among AMF taxa could be influenced by variation in propagation biology (e.g., Abbott and Robson 1991;Friese and Allen 1991). Taxa of AMF can also vary in their ability to grow in pot cultures in general, or in specific conditions imposed by greenhouse trials, such as soil pH or P availability (Brundett et al 1996).…”

Section: Plant P Contentmentioning

confidence: 99%

The extent of mycorrhizal colonization of roots and its influence on plant growth and phosphorus content

2013

View full text Add to dashboard Cite

Aims The most common metric of arbuscular mycorrhizal fungal (AMF) abundance is percent root length colonized (PRLC) by mycorrhizal structures. Frequently, plants with greater PRLC are assumed to receive more nutrients (such as phosphorus, P) from their mycorrhizal symbionts, leading to greater plant growth. Nevertheless, the functional significance of this metric remains controversial. In this review, I discuss whether manipulations of PRLC generally led to changes in plant biomass and P content, and whether AMF taxa and plant functional groups influence these relationships. Methods I conducted a meta-analysis of laboratoryand field-based trials in which mycorrhizal colonization was directly altered compared to unmanipulated controls. For each trial, I calculated (1) the difference in PRLC (ΔPRLC) between the treatments, and (2) the response ratio of plant biomass. In a subset of these studies, the response ratio of P content of host plants could also be calculated. ResultsThe response ratio of plant biomass and P content rose significantly and exponentially as ΔPRLC increased. Nevertheless, ΔPRLC explained only a fraction of the variation in response ratios in each case. Moreover, AMF taxa varied in their effects on biomass per unit ΔPRLC. In addition, plant functional groups differed in effects on plant P content per unit ΔPRLC, with C4 grasses responding most strongly. Conclusions It appears that as the extent to which plant roots are colonized by AMF increases, plant growth and P content often increase, although substantial variability exists among trials. As others have found, a likely mechanism for this relationship is increased transfer of P (and perhaps other nutrients) through the more-prevalent mycorrhizal structures.

show abstract

“…Arbuscular mycorrhizal (AM) fungi are thought to derive all organic energy from the host plant. The host, in return, may gain increased uptake of less mobile nutrients, in part, owing to the AM fungus forming an extensive hyphal network beyond the root (Abbott & Robson, 1991).…”

Section: Introductionmentioning

confidence: 99%

High densities of arbuscular mycorrhizal fungi maintained during long fallows in soils used to grow cotton except when soil is wetted periodically

Pattinson

McGee

1997

New Phytologist

View full text Add to dashboard Cite

SUMMARY Sequential harvests of cotton seedlings grown in soil cores enabled the quantification of the density of arbuscular mycorrhizal fungi to detect the effects of time, cultivation and periodic wetting of the soil. Cotton seedlings grown in soil cores from three locations formed arbuscular mycorrhizas at similar rates when cores were stored dry for up to 18 months. Disturbance of dry cores followed by dry storage for 18 months did not reduce the rate of establishment of mycorrhizas. Periodic wetting and drying of the cores, especially if the cores had first been disturbed, significantly reduced the rate of establishment of mycorrhizas. We suggest that long fallow disorder is possibly caused by falls of rain in clay soils of eastern Australia used to grow cotton. The proportion of the root with mycorrhizas at 3 wk was strongly correlated with the infection at 8 wk. We also suggest that it might be possible to predict maximum levels of infection and early uptake of phosphate of seedlings by determining the proportion of roots that are mycorrhizal 3 wk after emergence of cotton seedlings.

show abstract

Factors influencing the occurrence of vesicular-arbuscular mycorrhizas

Cited by 301 publications

References 160 publications

Distribution of roots and arbuscular mycorrhizal associations in tropical forest types of Xishuangbanna, southwest China

Distribution of roots and arbuscular mycorrhizal associations in tropical forest types of Xishuangbanna, southwest China

The extent of mycorrhizal colonization of roots and its influence on plant growth and phosphorus content

High densities of arbuscular mycorrhizal fungi maintained during long fallows in soils used to grow cotton except when soil is wetted periodically

Contact Info

Product

Resources

About