Composition of coffee shade tree species and density of indigenous arbuscular mycorrhizal fungi (AMF) spores in Bonga natural coffee forest, southwestern Ethiopia

Muleta, Diriba; Assefa, Fassil; Nemomissa, Sileshi; Granhall, Ulf

doi:10.1016/j.foreco.2007.01.021

Cited by 78 publications

(64 citation statements)

References 39 publications

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“…In contrast to our finding, Muleta et al (2007) observed a positive relationship between spore number and available P in soil samples from natural coffee forest inEthiopia. They suggested that the characteristics of available P level in their study were not high enough to influence mycorrhizal development.…”

Section: Discussioncontrasting

confidence: 99%

“…The legume is the most important component of the acacia woodland, which is the major vegetation from the arid and semi-arid parts of Ethiopia being utilized in many different ways for the rural economy, and to rehabilitate and stabilize degraded ecosystem especially in the Rift Valley of Ethiopia (Eshete and Stahl, 1999). Although, several studies have been carried out in relation to diversity and density of AMF on coffee and shade trees in montaine forests (Wubet et al, 2003;Muleta et al, 2007), and in the dry deciduous woodlands of Northern Ethiopia (Birhane et al, 2010), studies on the AMF-acacia relationship was limited to the co-inoculation of AMF and rhizobia. The AMF species found in earlier studies of acacia trees belong mainly to the genera Glomus and Gigaspora (Michelson, 1993;Yohannes and Assefa, 2009).…”

Section: Introductionmentioning

confidence: 99%

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Diversity and abundance of arbuscular mycorrhizal fungi associated with acacia trees from different land use systems in Ethiopia

Belay¹,

Vestberg²,

Assefa³

2013

Afr. J. Microbiol. Res.

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Root samples and rhizosphere soil of nine acacia species (Acacia abyssinica, Faidherbia albida, A. nilotica, A. senegal, A. seyal, A. sieberiana, A. saligna, A. tortilis and A. robusta) were collected from Bishoftu, Zeway and Addis Ababa sites with different land use types to assess their Arbuscular Mycorrhizal Fungal (AMF) diversity, spore density and root colonization. The percentage of root length colonized by AMF was estimated. Spores, spore clusters and sporocarps extracted from soil samples were counted and morphologically identified to species or specific morphotype. Roots of all acacia species were colonized from low to moderate or relatively high levels by AMF with the occurrence of arbuscules, vesicles and hyphae. Arbuscules were however not detected in roots of A. senegal. The highest AM fungal colonization was found in A. seyal (67.3%) from open grazing field (OGF) at Zeway followed by A. nilotica (44%), whereas the lowest AMF colonization of 12% was recorded in A. saligna at Bishoftu. Rhizosphere soils harbored AMF fungal spores ranging from 3.7 spores g -1 soil in A. nilotica to 15.0 spores g -1 in A. seyal from open grazing field (OGF) at Zeway. A total of 41 AMF species in 14 genera and 7 families of the Glomeromycota were identified. Nine species belonged to Acaulospora, 6 to Funneliformis, 4 each to Gigaspora, Glomus, and Rhizophagus, 3 each to Claroideoglomus, and Scutellospora, 2 each to Racocetra and Diversispora, and 1 each to Entrophospora, Sclerocystis, Paraglomus and Pacispora. Moreover, 2 unidentified morphotypes each of Glomus, and Acaulospora and 1 of Archaeospora were isolated. Based on relative abundance and isolation frequency of spores, C. claroideum, C. etunicatum, C. luteum, F. geosporus and G. aggregatum were the dominant species in the study. The study showed that the acacia species were characterized by relatively high AMF colonization and very high AMF diversity. AMF spore density and AM root colonization in acacia roots were influenced by soil factors such as available P and soil texture.

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Section: Discussioncontrasting

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Diversity and abundance of arbuscular mycorrhizal fungi associated with acacia trees from different land use systems in Ethiopia

Belay¹,

Vestberg²,

Assefa³

2013

Afr. J. Microbiol. Res.

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“…Glomus was the dominant genus in all soils under each tree species both in terms of species diversity and spore density (Tables 2 and 3). This is in line with findings not only from dry afromontane forests of Ethiopia (Tesfaye et al, 2003b) and Bonga natural coffee forest (Muleta et al, 2007), but also from the tropical rain forest of Xishuangbanna, Yunnan, China (Zhao et al, 2001), tropical rain forest in Mexico (Guadarrama and Alvarez-Sanchez 1999), and arid and semi-arid lands of north Jordan (Mohammad et al, 2003).…”

Section: Discussionsupporting

confidence: 88%

“…Mycorrhizal colonization rates of a number of tree species in an afromontane forest were also estimated (Tesfaye et al, 2003a). On top of that, the number of coffee shade tree species and density of AM fungi spores in Bonga natural coffee forest soils of southwestern Ethiopia (in the same forest as the present study but at different locations) were also investigated (Muleta et al, 2007). The latter authors identified the dominant coffee shade tree species, evaluated their densities, and quantified and characterized AM fungi populations particularly within the rhizosphere of coffee plants.…”

Section: Introductionmentioning

confidence: 90%

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Arbuscular mycorrhizal fungi associated with shade trees and Coffea arabica L. in a coffee-based agroforestry system in Bonga, Southwestern Ethiopia

Sewnet

Tuju

2013

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(1) Haramaya University, Ethiopia (2) Addis Ababa University, EthiopiaIn a first step to understand the interactions between Coffea arabica L. trees and mycorrhizae in Ethiopia, an investigation of the current mycorrhizal colonization status of roots was undertaken. We sampled 14 shade tree species occurring in coffee populations in Bonga forest, Ethiopia. Scutellospora (Sp1 & Sp2) and Gigaspora (Sp1 & Sp2) were found under all 14 shade tree species, whereas Acaulospora (Sp1) occurred only in slightly acidic soils, within a pH range of 4.93-5.75. Generally, roots of the coffee trees were colonized by arbuscules to a greater degree than those of their shade trees, the arbuscular colonization percentage (AC%) of the former being higher than the latter (significant difference at 0.05 level). Though differences were not statistically significant, the overall hyphal colonization percentage (HC%) and mycorrhizal hyphal colonization percentage (MHC%) were shown to be slightly higher under coffee trees than under their shade trees. However, the differences were statistically significant at 0.05 level in the case of HC% values of coffee trees under Pouteria adolf-friederici and MHC% under Cordia africana. Spore density and all types of proportional root colonization parameters (HC%, MHC%, AC% and vesicular colonization percentage, VC%) for both coffee and shade trees were negatively and significantly correlated with organic soil carbon, total N, available P, EC and Zn. Correlation between arbuscular colonization for coffee (AC%) and organic carbon was not significantly positive at a 0.05 level. Incidence of specific spore morphotypes was also correlated with physical and chemical soil properties. Results indicate that AM fungi could potentially be important in aforestation and help to promote coffee production activities in Ethiopia providing an alternative to expensive chemical fertilizer use, and would offer management methods that take advantage of natural systems dynamics that could potentially preserve and enhance coffee production.

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In vitro Antagonism of Rhizobacteria Isolated from Coffea arabica L. against Emerging Fungal Coffee Pathogens

Muleta

Assefa

Granhall³

2007

Engineering in Life Sciences

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In vitro antagonistic effects of rhizobacteria associated with Coffea arabica L. against some fungal coffee pathogens were studied. The aims were to screen indigenous coffee‐associated isolates for their inherent antagonistic potential against major coffee wilt diseases induced by Fusarium spp. Antagonistic effects, siderophore, HCN and lytic enzyme production were determined on standard solid media. Chemical methods were employed to categorize the major types of siderophores. From a total of 212 rhizobacterial isolates tested, over 10 % (all Pseudomonas and Bacillus spp.) exhibited remarkable inhibition against Fusarium spp. One isolate AUPB24 (P. chlororaphis) showed maximum inhibition of mycelial growth against all fungal pathogens tested, whereas other isolates were mostly inhibitory to F. stilboides and F. oxysporum. The isolate AUBB20 (B. subtilis) was most antagonistic to F. xylarioides. Of the rhizobacterial isolates tested, 67 % produced siderophores and 35 % produced HCN. Many strains (all Pseudomonas spp.) produced siderophores of the hydroxamate type and only a small proportion produced those of the catecholate type. Few antagonists showed chitinase activity. The production of siderophores and HCN by Pseudomonas spp., lipase and protease by all antagonists and β‐1,3‐glucanase by several Bacillus spp. could be considered the major mechanisms involved in the inhibition of fungal growth. The in vitro results provide the first evidence of an antagonistic effect of coffee‐associated rhizobacteria against the emerging fungal coffee pathogens F. stilboides and F. xylarioides and indicate the potential of both bacterial groups for biological control of coffee wilt diseases.

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Composition of coffee shade tree species and density of indigenous arbuscular mycorrhizal fungi (AMF) spores in Bonga natural coffee forest, southwestern Ethiopia

Cited by 78 publications

References 39 publications

Diversity and abundance of arbuscular mycorrhizal fungi associated with acacia trees from different land use systems in Ethiopia

Diversity and abundance of arbuscular mycorrhizal fungi associated with acacia trees from different land use systems in Ethiopia

Arbuscular mycorrhizal fungi associated with shade trees and Coffea arabica L. in a coffee-based agroforestry system in Bonga, Southwestern Ethiopia

In vitro Antagonism of Rhizobacteria Isolated from Coffea arabica L. against Emerging Fungal Coffee Pathogens

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