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

Afrika Focus ◽  
2013 ◽  
Vol 26 (2) ◽  
Author(s):  
Tadesse Chanie Sewnet ◽  
Fassil Assefa Tuju
Keyword(s):  
Arbuscular Mycorrhizal Fungi ◽  
Tree Species ◽  
Mycorrhizal Fungi ◽  
Coffea Arabica ◽  
Arbuscular Mycorrhizal ◽  
Am Fungi ◽  
Shade Trees ◽  
Coffee Production ◽  
Shade Tree ◽  
Coffea Arabica L

In 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. Milletia ferruginea, Scheffiera abyssinica, Croton macrostachyus, Ficus vasta, F. sur, Albizia gummifera, Olea capensis, Cordia africana, Ehretia abyssinica, Pouteria adolfi-friederici, Pavetta oliveriana, Prunus africana, Phoenix reclinata and Polyscias fulva. Coffee trees sampled under each shade tree were all shown to be colonized by arbuscular mycorrhizal fungi (AM fungi). Four genera and 9 different species of AM fungi were found in the soils. Glomus (Sp1, Sp2, & Sp3 & Sp4), 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. Key words: aforestation; agroforestry, coffee groves, ecology, integrated production systems, rhizosphere, sustainable agriculture, symbiosis 

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

Afrika Focus ◽  
2013 ◽  
Vol 26 (2) ◽  
pp. 111-131
Author(s):  
Tadesse Chanie Sewnet ◽  
Fassil Assefa Tuju
Keyword(s):  
Arbuscular Mycorrhizal Fungi ◽  
Tree Species ◽  
Mycorrhizal Fungi ◽  
Arbuscular Mycorrhizal ◽  
Am Fungi ◽  
Shade Trees ◽  
Coffee Production ◽  
Shade Tree ◽  
Significant Difference ◽  
Cordia Africana

In a first step to understand the interactions between Colfea 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. Milletia ferruginea, Schefflera abyssinica, Croton macrostachyus, Ficus vasta, F. sur, Albizia gummifera, Olea capensis, Cordia africana, Ehretia abyssinica, Pouteria adolfi-friederici, Pavetta oliveriana, Prunus africana, Phoenix reclinata and Polyscias fulva. Coffee trees sampled under each shade tree were all shown to be colonized by arbuscular mycorrhizal fungi (AM fungi). Four genera and 9 different species of AM fungi were found in the soils. Glomus (Sp1, Sp2, & Sp3 & Sp4), 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.

scholarly journals Roles of arbuscular mycorrhizal fungi on acclimatization of clones of Coffea arabica L. produced by somatic embryogenesis

2020 ◽  
Vol 44 ◽  
Author(s):  
Arley José Fonseca ◽  
Guilherme Augusto Teixeira Tassone ◽  
Marco Aurélio Carbone Carneiro ◽  
Gladyston Rodrigues Carvalho ◽  
Carlos Henrique Siqueira Carvalho ◽  
...  
Keyword(s):  
Somatic Embryogenesis ◽  
Arbuscular Mycorrhizal Fungi ◽  
Mycorrhizal Fungi ◽  
Coffea Arabica ◽  
Arbuscular Mycorrhizal ◽  
Production Costs ◽  
Seedling Production ◽  
Nutrient Contents ◽  
Rhizophagus Clarus ◽  
Coffea Arabica L

ABSTRACT The production of Coffea arabica L. clone seedlings through the somatic embryogenesis technique is one of the alternatives of greatest demand for coffee producers. However, clones can face difficulties related to acclimatization carried out under greenhouse conditions, which can increase the production costs. A tested alternative with promising results is inoculation with arbuscular mycorrhizal fungi (AMF) during the seedling acclimatization process. Thus, this study aimed to promote the improvement of the seedling production process through somatic embryogenesis associated with inoculation with AMF. For the production of the clones, seedlings were used in the phase when they presented four pairs of leaves (Clone 1 “Fruiting red Catucaí” and Clone 2 “Acauã”), using “somatic embryogenesis” bioreactors, followed by inoculation with Rhizophagus clarus, Gigaspora margarita and Acaulospora mellea, a mixture of R. clarus and G. margarita and a mixture of R. clarus, G. margarita and A. mellea. After six months, agronomic parameters, leaf nutrient contents and root mycorrhizal colonization were evaluated. The studied clones behaved differently when inoculated with AMFs. Clone 1 showed the best development in the greenhouse, which was determined by the agronomic parameters. Thus, Clone 1 is indicated for the production of vigorous seedlings when associated with inoculation with AMFs.

scholarly journals Biodiversity of AM Fungi in Coffee Cultivated on Eroded Soil

Agronomy ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 567
Author(s):  
Liliana Lara-Capistran ◽  
Ramon Zulueta-Rodriguez ◽  
Bernardo Murillo-Amador ◽  
Pablo Preciado-Rangel ◽  
Danis M. Verdecia-Acosta ◽  
...  
Keyword(s):  
Mycorrhizal Fungi ◽  
Coffea Arabica ◽  
Host Plants ◽  
Cultural Practices ◽  
Arbuscular Mycorrhizal ◽  
Am Fungi ◽  
Soil Improvement ◽  
Growth And Yield ◽  
Coffee Plantations ◽  
Coffea Arabica L

Arbuscular mycorrhizal fungi (AMFs) play an important role in soil improvement, leading to the enhanced growth and yield of the host plants. The diversity, abundance, and richness of AMFs were evaluated in eight coffee plantations (Coffea arabica L.) with different erosion degrees. The results indicated that 26 AMFs morphotypes scattered across four genera were recovered and included five species. Funneliformis species were the most dominant representatives of the total isolates followed by Claroideoglomus, Rhizoglomus, Gigaspora, Acaulospora, Glomus, Diversispora, Septoglomus, and Scutellospora. The highest diversity and richness were found in non-eroded agroecosystems, followed by sites with a minimum erosion, and the lowest values were reported within the highly eroded agroecosystems. These results suggest that eroded soil affects AMF fungi, creating the need to carry out studies that allow for the implementation of cultural practices where biodiversity and soil are preserved.

scholarly journals Response of Arbuscular Mycorrhizal Fungi to Simulated Climate Changes by Reciprocal Translocation in Tibetan Plateau

2015 ◽  
Vol 43 (2) ◽  
pp. 488-493
Author(s):  
Zhaoyong SHI ◽  
Xubin YIN ◽  
Bede MICKAN ◽  
Fayuan WANG ◽  
Ying ZHANG ◽  
...  
Keyword(s):  
Tibetan Plateau ◽  
Arbuscular Mycorrhizal Fungi ◽  
Reciprocal Translocation ◽  
Mycorrhizal Fungi ◽  
Climate Changes ◽  
Arbuscular Mycorrhizal ◽  
Am Fungi ◽  
Spore Density ◽  
The Tibetan Plateau ◽  
Colonization Frequency

Arbuscular mycorrhiza (AM) fungi are considered as an important factor in predicting plants and ecosystem responses to climate changes on a global scale. The Tibetan Plateau is the highest region on Earth with abundant natural resources and one of the most sensitive region to climate changes. To evaluate the complex response of arbuscular mycorrhizal fungi colonization and spore density to climate changes, a reciprocal translocation experiment was employed in Tibetan Plateau. The reciprocal translocation of quadrats to AM colonization and spore density were dynamic. Mycorrhizal colonization frequency presented contrary changed trend with elevations of quadrat translocation. Colonization frequency reduced or increased in majority quadrats translocated from low to high or from high to low elevation. Responses of colonization intensity to translocation of quadrats were more sensitive than colonization frequency. Arbuscular colonization showed inconsistent trend in increased or decreased quadrat. Vesicle colonization decreased with changed of quadrat from low to high elevations. However, no significant trend was observed. Although spore density was dynamic with signs of decreasing or increasing in translocated quadrats, the majority enhanced and declined respectively in descent and ascent quadrat treatments. It is crucial to understand the interactions between AM fungi and prairie grasses to accurately predict effects of climate change on these diverse and sensitive ecosystems. This study provided an opportunity for understanding the effect of climate changes on AM fungi.

scholarly journals Diversity of arbuscular mycorrhizal fungi in the rhizosphere of Coffea arabica in the Republic of Yemen

2013 ◽  
Vol 64 (1) ◽  
pp. 4888 ◽  
Author(s):  
AHNA Al-Arequi ◽  
M Chliyeh ◽  
F Sghir ◽  
A Ouazzani Touhami ◽  
R Benkirane ◽  
...  
Keyword(s):  
Arbuscular Mycorrhizal Fungi ◽  
Mycorrhizal Fungi ◽  
Coffea Arabica ◽  
Arbuscular Mycorrhizal ◽  
The Republic

scholarly journals Invasion of a xeric forest by an exotic tree species in Argentina: Impacts on the diversity of arbuscular mycorrhizal fungi and pre-existing mutualistic relationships

2021 ◽  
Vol 35 (2) ◽  
pp. 269-275
Author(s):  
Camila Abarca ◽  
Marcelo Daniel Barrera ◽  
Marta Cabello ◽  
Fabricio Valdés ◽  
María Silvana Velázquez
Keyword(s):  
Arbuscular Mycorrhizal Fungi ◽  
Tree Species ◽  
Mycorrhizal Fungi ◽  
Arbuscular Mycorrhizal ◽  
Exotic Tree

scholarly journals Aspects of arbuscular mycorrhizal fungi in an atlantic forest chronosequence parque estadual turístico do Alto Ribeira (petar), SP

2004 ◽  
Vol 4 (2) ◽  
pp. 1-15 ◽  
Author(s):  
Marcos P.M. Aidar ◽  
Rosilaine Carrenho ◽  
Carlos A. Joly
Keyword(s):  
Arbuscular Mycorrhizal Fungi ◽  
Atlantic Forest ◽  
Tree Species ◽  
Mycorrhizal Fungi ◽  
Late Phase ◽  
Arbuscular Mycorrhizal ◽  
Diversity Indices ◽  
Mycorrhizal Colonization ◽  
Wet Season ◽  
Generic Level

Mycorrhizal colonization was assessed in roots of trees within an Atlantic Forest chronosequence, located in the southeastern of São Paulo State, Brazil, inside Tourist State Park of the High Ribeira Valley (PETAR). The phytosociological survey was carried out in three adjacent areas, all on calcareous soil, which correspond to different time intervals during which they have been left abandoned following a slash-and-burn agricultural perturbation. Early Phase (EP) with 15 years; Mid Phase (MP) with 25 years; and Late Phase (LP) with more than 36 years without clear-cut. The inventory indicated a continuum of tree species substitution, which is dominated by species of Leguminosae, especially Piptadenia gonoacantha (Mart.) J.F. Macbr. (Mimosoideae) in the earlier successional phases. Mycorrhizal colonization, estimated by the occurrence of the mycorrhizal structures in the tree species roots, diminished during the season with less rain (winter), and showed no significant differences between successional phases in the wet season (summer). Rather, the mycorrhizal colonization was correlated with occurrence of the tree’s successional status: being positively correlated with occurrence of pioneer species, and negatively correlated with late secondary species. Mycorrhizal colonization was also correlated negatively with soil organic matter and base saturation. Twenty five species of arbuscular mycorrhizal fungi belonging to four genera were identified. Six species were only identified to generic level. The species Glomus etunicatum Becker & Gerd. represented 10% of the total number of spores and occurred in all phases and seasons, while the genus Glomus represented 57% of the total of spores found in the rhizosphere. The diversity indices evaluated for the mycohrriza community were: H’ = 2.3, J’ = 0.97 and R = 4.12. These results are a contribution to the knowledge of The Atlantic Forest biodiversity and may have implications to support programs regarding rehabilitation of degraded vegetation in one of the World’s most threatened Biomes.

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