Arbuscular mycorrhizal fungi associated with the Meliaceae on Hainan island, China

Abstract

Species richness, spore density, frequency of occurrence, and relative abundance of AM fungi were determined in rhizosphere soil samples from nine tropical rainforest sites on Hainan island, south China, and the arbuscular mycorrhizal (AM) status of members of the Meliaceae was examined. All 28 plant taxa investigated (25 species including two varieties of 1 species and three varieties of another) were colonized by AM fungi. The mean proportion of root length colonized was 56% (range 10-95%). Vesicles were observed in 27 and hyphal coils in 26 of the 28 plant taxa. Mycorrhizas were of the Paristype or intermediate-type, with no Arum-type mycorrhizas observed. Species richness of AM fungi varied from 3 to 15 and spore density from 46 to 1,499 per 100 g rhizosphere soil. Of 33 AM fungal taxa in five genera isolated and identified, 18 belonged to Glomus, 9 to Acaulospora, 1 to Entrophospora, 2 to Gigaspora, and 3 to Scutellospora. Acaulospora and Glomus were the dominant genera identified. Glomus claroideum was the taxon most commonly isolated, with a frequency of occurrence of 56.5% and relative abundance of 10.4%. A positive correlation was found between percentage of root length colonization and species richness. However, there was no correlation between spore density and percentage of root length colonized by AM fungi.

Arbuscular mycorrhizal fungi associated with tree peony in 3 geographic locations in China

“…The dominance of AMF in tree peony was also in agreement with the observations documented for other horticultural plants in previous studies (Guo et al, 2007;Guo and Liu, 2010;Bechem and Alexander, 2012;Yamato et al, 2012). The occurrence frequency of arbuscules in all cultivars except for HQW in the Xibei cultivar group was lower than that of vesicles, which is in accord with our studies in other plant species or ecosystems (Shi et al, 2006a(Shi et al, , 2006b(Shi et al, , 2007. One possible reason is the characteristic of arbuscules being short-lived, which is related to the absorption and storage of soil nutrients (Shi et al, 2007).…”

“…The AM fungal diversity that we observed in the different cultivar groups was similar to that of a study done by Guo et al (2007) in the Zhongyuan cultivar group and other ecosystems such as grassland (Gai et al 2009), and these levels of fungal diversity are lower than that of a forest ecosystem (Shi et al, 2006a). Two possible explanations could be (1) the effect of the diversity of host plants and (2) the influence of long-term fertilization.…”

Effectiveness of native arbuscular mycorrhiza on the growth of four tree forest species from the Santa Marta Mountain, Veracruz (Mexico)

“…Cuervo & Rivas (2007) indicated that the number of spores and the colonization percentage are indicators of AMF establishment in roots, but they do not indicate the mycorrhizal effectiveness on host. Shi et al (2006) referred that when the AMF species richness is greater, the root colonization percentage is higher too, regardless the spore number in the soil. For L. styraciflua the number of spores found in the AMF rhizosphere at field conditions might indicate that the native mycorrhizal inoculum has high infectivity in roots as it was observed in the sample nine (> 50% colonization).…”

Species richness and composition of arbuscular mycorrhizal fungi occurring on eucalypt trees (Eucalyptus camaldulensis Dehnh.) in rainy and dry season

“…Species richness (SR), relative abundance (RA) and isolation frequency (IF) of AMF were expressed as follows: species richness was determined for each of the ten sites; relative abundance was the number of AMF spores of a species divided by the total spores in a season ×100; and isolation frequency was the number of sites where the AMF species was observed divided by the total number of sites ×100 (Shi et al 2006). In addition, AMF diversity was evaluated through Simpson's index of dominance:…”