Abundance and diversity of Arbuscular mycorrhizal fungal (AMF) communities associated with cassava (Manihot esculenta Crantz) rhizosphere in Abengourou, East Cte dIvoire

Abstract

Soils from four different cassava cropping fields (Aniansué 1, Aniansué 2, Dramanekro 1, Dramanekro 2) were analyzed to evaluate abundance and diversity of Arbuscular Mycorrhizal Fungi associated with cassava rhizosphere in Abengourou, East Côte d'Ivoire. It was shown that the soils in the cassava cropping fields were all acidic with low levels of available phosphorus (P). A total of 29 species belonging to six different genera (Acaulospora, Ambispora, Claroideoglomus, Gigaspora, Glomus and Scutellospora) were found at Aniansué 1, 28 species belonging to six different genera (Glomus, Claroideoglomus, Acaulospora, Ambispora, Gigaspora, Pacispora) were found at Aniansué 2, 30 species belonging to six different genera (Glomus, Acaulospora, Ambispora, Gigaspora, Pacispora, Scutellospora) were found at Dramanekro 1 and 27 species belonging to five different genera (Glomus, Acaulospora, Ambispora, Gigaspora, Scutellospora) were found at Dramanekro 2. The genus Glomus was dominant at each cassava cropping field. Spore densities were high, positively correlated with both soil pH and Mg 2+ , but negatively with available P. Trap culture revealed good infection potential for all soils. The frequencies of mycorrhizal roots were more than 93% for all field soils.

Composition of arbuscular mycorrhizal fungi associated with cassava (<i>Manihot esculenta</i> Crantz) cultivars as influenced by chemical fertilization and tillage in Cameroon

“…The present study showed that Glomus was the predominant genus in terms of spore density and morphotypes (Table 3, 5). A similar finding was obtained from rhizosphere soil under cassava in Brazil (De Souza et al, 1999), in South Africa (Straker et al, 2010) and in Cote d'Ivoire (Bi Voko et al, 2013). Glomus species are considered as widespread fungi in many ecosystems (Sýkorová et al, 2007).…”

“…Another factor, which could have affected root colonization, is the size of some AM fungal species population in soil. Although we did not estimate this parameter in the present study, other reports showed strong operation of the degree of host-fungus specificity (Straker et al, 2010;Bi Voko et al, 2013). On the other hand, the better AMF colonization status of cassava in Bityili (45%) as compared to that in Andom (35%) might have enhanced the soil residual nutrients after 10 months cultivation as evidenced by soil data in Table 1.…”

“…Cassava is known to form mycorrhizal symbiosis (Oyetunji & Osonubi, 2007;Straker et al, 2010;Bi Voko et al, 2013;Ceballos et al, 2013). This study reports the root colonization, the population density and composition of AMF in a selection of cassava cropping systems in Cameroon.…”

Distinct arbuscular mycorrhizal fungal communities associate with different manioc landraces and Amazonian soils

“…Many studies have demonstrated the positive effect of AM on manioc performance in comparison with non-mycorrhizal treatments (Ceballos et al 2013;Dodd et al 1990;Fagbola et al 1998;Sieverding 1990; Sieverding and Howeler 1985;Sieverding and Toro 1990). AM association in manioc has been studied by assessing AM colonization of manioc roots, and by characterizing soil AM fungal communities co-occurring with manioc, in the hope of identifying suitable AM fungal symbionts for manioc (Séry et al 2016;Straker et al 2010;Voko et al 2013). The latter approach has mainly relied on descriptions of AM fungal spores isolated from soil or trap cultures, as until recently, limited methods were available for studying AM fungi actively involved in the symbiosis (i.e., within plant root tissues) (Anderson and Cairney 2004;Öpik et al 2006).…”

Arbuscular mycorrhizal fungal dynamics following change of land use from mature forest to Eucalyptus plantation

“…AMF spore abundance is reported to be closely related to soil type and soil pH (Gai & Liu, 2003;Lekberg et al, 2011). According to Bivoko et al (2013), AMF preferred nearneutral pH values and high organic matter content, while greater nutrient concentrations (N and P) and high pH values can limit AMF development (Correnho et al, 2014). Margesin and Schinner (2005) also reported of a direct relationship between soil organic carbon content and the abundance and activity of soil microbes.…”