Field Survey of the Distribution of Vesicular-Arbuscular Mycorrhizal Fungi in Relation to Soil pH

Porter, WM; Robson, A. D.; Abbott, Lynette

doi:10.2307/2403900

Cited by 140 publications

(63 citation statements)

References 8 publications

(6 reference statements)

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…in West of Bahia plantations may reflect its tendency to be part of the Cerrado's bioclimatic region, which have shown high incidence of this genus (24). Alternatively, it may reflects low soil organic matter content as observed by Porter et al (18) and also, soils with pH higher than 5.5 (23). Low soil pH influenced the occurrence of A. mellea and A. morrowiae, which corroborates other findings regarding the occurrence of these species in highly weathered soils (24,30).…”

Section: Discussionmentioning

confidence: 99%

Arbuscular mycorrhizal fungi in papaya plantations of Espírito Santo and Bahia, Brazil

Trindade¹,

Siqueira²,

Stürmer³

2006

Braz. J. Microbiol.

View full text Add to dashboard Cite

The aim of this study was to obtain knowledge on arbuscular mycorrhizal (AM) associations in papaya (Carica papaya, L.) in field soils and nursery conditions. Sixty seven soil and root samples were taken in February and May of 1996, from 47 commercial plantations in the North of Espirito Santo State and the West and South of Bahia State, in Brazil. Samples were used for direct spore counts, root colonization assessment and for trap culture with Sorghum bicolor (L.) Moench and Crotalaria juncea L. Additional sampling was done in commercial nurseries to evaluate mycorrhizal colonization. Although papaya cropping systems are usually under high input of fertilizers and pesticides, papaya roots showed considerable arbuscular mycorrhizal (AM) colonization, ranging from 6% to 83%. Colonization rates were most influenced by available soil P, correlated positively with percentage of sand and soil pH, but correlated negatively with soil clay content. AM colonization of nursery seedlings was very low in most samples. Field spore numbers varied from 34 to 444/30g of soil. All Glomerales families were represented and 24 fungal species identified. Glomus etunicatum, Paraglomus occultum, Acaulospora scrobiculata and Gigaspora sp. were the most common species.

show abstract

Section: Discussionmentioning

confidence: 99%

Arbuscular mycorrhizal fungi in papaya plantations of Espírito Santo and Bahia, Brazil

Trindade¹,

Siqueira²,

Stürmer³

2006

Braz. J. Microbiol.

View full text Add to dashboard Cite

show abstract

“…Reports of spore densities in soil vary markedly from 1.2 spores/g under pasture (Porter et al 1987) to 7-20 spores/g in soil taken from barley fields (Black and Tinker 1979). Thompson (1996) recovered about 93 spores/g from a heavy-clay Vertosol on the Darling Downs.…”

Section: Response By Sugarcane To Varying Am Densitiesmentioning

confidence: 99%

Growth responses of sugarcane to mycorrhizal spore density and phosphorus rate

Kelly

Edwards

Thompson³

et al. 2005

Aust. J. Agric. Res.

View full text Add to dashboard Cite

Abstract. Arbuscular mycorrhizal (AM) fungi, commonly found in long-term cane-growing fields in northern Queensland, are linked with both negative and positive growth responses by sugarcane (Saccharum spp.), depending on P supply. A glasshouse trial was established to examine whether AM density might also have an important influence on these growth responses. Mycorrhizal spores (Glomus clarum), isolated from a long-term cane block in northern Queensland, were introduced into a pasteurised low-P cane soil at 5 densities (0, 0.06, 0.25, 1, 4 spores/g soil) and with 4 P treatments (0, 8.2, 25, and 47 mg/kg). At 83 days after planting, sugarcane tops responded positively to P fertilizer, although responses attributable to spore density were rarely observed. In one case, addition of 4 spores/g led to a 53% yield response over those without AM at 8 mg P/kg, or a relative benefit of 17 mg P/kg. Root colonisation was reduced for plants with nil or 74 mg P/kg. For those without AM, P concentration in the topmost visible dewlap (TVD) leaf increased significantly with fertiliser P (0.07 v. 0.15%). However, P concentration increased further with the presence of AM spores. Irrespective of AM, the critical P concentration in the TVD leaf was 0.18%. This study confirms earlier reports that sugarcane is poorly responsive to AM. Spore density, up to 4 spores/g soil, appears unable to influence this responsiveness, either positively or negatively. Attempts to gain P benefits by increasing AM density through rotation seem unlikely to lead to yield increases by sugarcane. Conversely, sugarcane grown in fields with high spore densities and high plant-available P, such as long-term cane-growing soils, is unlikely to suffer a yield reduction from mycorrhizal fungi.

show abstract

“…According to the CCA analysis, pH also played an important role in influencing the distribution of the AM fungus spore community (Figure 3). The soil pH was lower in the moderately and severely degraded sites (Table I) and the disappearance of some common or rare AM species may due in part to the change in soil pH because it is known that some AM fungal species seem to be sensitive to changes in soil pH (Porter et al, 1987;Kurle and Pfleger, 1996;Coughlan et al, 2000).…”

Section: Influence Of Environmental Variables On Am Fungus Spore Commmentioning

confidence: 99%

Arbuscular mycorrhizal fungi in degraded typical steppe of inner Mongolia

et al. 2008

View full text Add to dashboard Cite

Arbuscular mycorrhizal (AM) fungi may have some potential use in the restoration of degraded grassland through beneficial effects on plant growth and soil quality. A field investigation was conducted in three grassland sites of typical steppe in Inner Mongolia. The three plant communities, one of which was undegraded, one moderately degraded and the third severely degraded, were studied by collecting soil samples and samples of four plant species that occurred in all three sites. The percentage of root length colonized by AM fungi was estimated and the species composition and diversity of AM fungus spores recovered from the soil were determined using spore morphological characteristics. Although differences between the sites may have been due partly to other factors, it is likely that the degree of degradation was an important factor. No decline was found in the AM colonization of the roots of the indicator plant species in the moderately or severely degraded plant communities, and two plant species showed higher colonization status in the two degraded areas. Glomus geosporum and Scutellospora calospora were the dominant AM fungi in the undegraded steppe, while G. geosporum and Glomus aggregatum dominated the two degraded sites which also had low spore densities, species richness and diversity indices. However, different AM species showed different distributions among the three plant communities and the results indicate that both biotic and abiotic factors were important in determining the AMF communities, with biotic factors possibly the more important.

show abstract

Field Survey of the Distribution of Vesicular-Arbuscular Mycorrhizal Fungi in Relation to Soil pH

Cited by 140 publications

References 8 publications

Arbuscular mycorrhizal fungi in papaya plantations of Espírito Santo and Bahia, Brazil

Arbuscular mycorrhizal fungi in papaya plantations of Espírito Santo and Bahia, Brazil

Growth responses of sugarcane to mycorrhizal spore density and phosphorus rate

Arbuscular mycorrhizal fungi in degraded typical steppe of inner Mongolia

Contact Info

Product

Resources

About