scholarly journals Spore density and root colonization by arbuscular mycorrhizal fungi in preserved or disturbed Araucaria angustifolia (Bert.) O. Ktze. ecosystems

2006 ◽  
Vol 63 (4) ◽  
pp. 380-385 ◽  
Author(s):  
Milene Moreira ◽  
Dilmar Baretta ◽  
Siu Mui Tsai ◽  
Elke Jurandy Bran Nogueira Cardoso
Keyword(s):  
Arbuscular Mycorrhizal Fungi ◽  
Mycorrhizal Fungi ◽  
Root Colonization ◽  
Extinction Risk ◽  
Arbuscular Mycorrhizal ◽  
The Other ◽  
Spore Density ◽  
Native Forest ◽  
Araucaria Angustifolia ◽  
Araucaria Forest

Araucaria angustifolia (Bert.) O. Ktze., a native forest tree from Brazil, is under extinction risk. This tree depends on arbuscular mycorrhizal fungi for growth and development, especially in tropical low-P soils but, despite being a conifer, Araucaria does not form ectomycorrhiza, but only the arbuscular endomycorrhiza. This study aimed at surveying data on the spore density and root colonization (CR) by arbuscular mycorrhizal fungi (AMF) in Araucaria angustifolia forest ecosystems, in order to discriminate natural, implemented, and anthropic action-impacted ecosystems, by means of Canonical Discriminant Analysis (CDA). Three ecosystems representative of the Campos do Jordão (SP, Brazil) region were selected: 1. a native forest (FN); 2. a replanted Araucaria forest (R); and 3. a replanted Araucaria forest, submitted to accidental fire (RF). Rhizosphere soil and roots were sampled in May and October, 2002, for root colonization, AMF identification, and spores counts. Root percent colonization rates at first collection date were relatively low and did not differ amongst ecosystems. At the second period, FN presented higher colonization than the other two areas, with much higher figures than during the first period, for all areas. Spore density was lower in FN than in the other areas. A total of 26 AMF species were identified. The percent root colonization and spore numbers were inversely related to each other in all ecosystems. CDA indicated that there is spatial distinction among the three ecosystems in regard to the evaluated parameters.

scholarly journals Biodiversity and distribution of arbuscular mycorrhizal fungi in Araucaria angustifolia forest

2007 ◽  
Vol 64 (4) ◽  
pp. 393-399 ◽  
Author(s):  
Milene Moreira ◽  
Dilmar Baretta ◽  
Siu Mui Tsai ◽  
Sandra Maria Gomes-da-Costa ◽  
Elke Jurandy Bran Nogueira Cardoso
Keyword(s):  
Arbuscular Mycorrhizal Fungi ◽  
Mycorrhizal Fungi ◽  
Root Colonization ◽  
Biological Diversity ◽  
Diversity Index ◽  
Arbuscular Mycorrhizal ◽  
Am Fungi ◽  
Araucaria Angustifolia ◽  
Forest Sustainability ◽  
Shannon’S Diversity Index

Araucaria angustifolia (Bert.) O. Ktze. is an endangered Brazilian coniferous tree that has been almost exterminated in the native areas because of uncontrolled wood exploitation. This tree has been shown to be highly dependent on arbuscular mycorrhizal fungi (AMF) and, therefore, AMF may be essential for forest sustainability and biological diversity. Root colonization, density and diversity of AMF spores were assessed in two Araucaria forest stands at the State Park of Alto Ribeira (PETAR), at two sampling dates: May and October. A comparison was made between a mature native stand composed of Araucaria trees mixed into a variety of tropical trees and shrubs, without any sign of anthropogenic interference (FN) and an Araucaria stand planted in 1987 (R), which has been used as a pasture. Assessments included percent root colonization, AMF spore numbers and species richness, Simpson's dominance index (Is), and Shannon's diversity index (H). Mycorrhizal root colonization did not differ between ecosystems in May. In October, however, the native stand (FN) presented a higher colonization than the planted forest (R), and the root colonization was more intense than in May. When considering both sampling periods and forests, 27 species of AM fungi, with higher numbers of spores in FN than in R were found. Canonical discriminant analysis (CDA) indicated Shannon's diversity index as the ecological attribute that contributed the most to distinguish between forest ecosystems, with higher value of H in FN in relation to R. CDA showed to be a useful tool for the study of ecological attributes.

scholarly journals Inoculum production of arbuscular mycorrhizal fungi native to soils under different forest covers

Revista CERES ◽  
2017 ◽  
Vol 64 (2) ◽  
pp. 197-204 ◽  
Author(s):  
Renata Soares dos Santos ◽  
Joilson Silva Ferreira ◽  
Rafael Nogueira Scoriza
Keyword(s):  
Arbuscular Mycorrhizal Fungi ◽  
Mycorrhizal Fungi ◽  
Forest Cover ◽  
Root Colonization ◽  
Arbuscular Mycorrhizal ◽  
Colonization Rate ◽  
Natural Fertility ◽  
Native Forest ◽  
Brazilian Soils ◽  
Spore Quantification

ABSTRACT The low natural fertility of Brazilian soils requires the use of inoculants that facilitate the absorption of nutrients by plants. Arbuscular mycorrhizal fungi such as obligatory biotrophics of active roots perform this function, but access to this resource is limited by the difficulty in producing inoculants. The objective of this study was to investigate the production of AMF inoculants native of soils under different forest covers in Vitória da Conquista, BA, by means of spore quantification, colonization rate and species identification. For this purpose, soils were collected from sites under Mata Nativa (native forest) and plantations of Madeira Nova (Pterogyne nitens) and Eucalyptus, placed into separate 500 mL disposable cups with seeds of Brachiaria sp. and cultivated for five months. Spores were quantified and the AMF species identified in the control soil (without brachiaria) and in the cups cultivated with brachiaria at each month. From the first month, the colonization rate of brachiaria roots was evaluated. The inoculants produced showed differences in the number of spores and species, in the AMF species identified, and in the root colonization rate as a function of the forest cover. Thus, considering the increase in the number of spores, species and colonization over time, the inoculant produced from the soil under native forest was more promising for utilization.

scholarly journals Species richness of arbuscular mycorrhizal fungi in forests with Araucaria in Southern Brazil

Hoehnea ◽  
2008 ◽  
Vol 35 (1) ◽  
pp. 63-68 ◽  
Author(s):  
Roberta Boscaini Zandavalli ◽  
Sidney Luiz Stürmer ◽  
Lúcia Rebello Dillenburg
Keyword(s):  
Species Richness ◽  
Arbuscular Mycorrhizal Fungi ◽  
Pinus Taeda ◽  
Mycorrhizal Fungi ◽  
Sucrose Solution ◽  
Arbuscular Mycorrhizal ◽  
Native Forest ◽  
Araucaria Angustifolia ◽  
Four Seasons ◽  
One Year

This study aimed to characterize species richness of arbuscular mycorrhizal fungi (AMF) in three distinct forests with Araucaria angustifolia (native forest, reforestation with A. angustifolia and plantation with Pinus taeda) in the "Floresta Nacional de São Francisco de Paula", State of Rio Grande do Sul, also accounting for seasonal variation. Six soil samples from each forest were collected from Araucaria angustifolia rhizosphere in four seasons during a one-year period, for identification of the AMF species. Spores were extracted by wet-sieving followed by centrifugation in water and 50% sucrose solution. The greatest richness (16 species) was found in the Araucaria reforestation and the lowest in the native forest (eight species). The season with higher species richness was different in each site. The most representative genera in all forests were Acaulospora and Glomus. Historical aspects and plant species composition can account for some of the differences among sites.

scholarly journals Eksplorasi Fungi Mikoriza Arbuskula pada Perkebunan Kelapa Sawit PT. Lembah Bhakti di Rawa Singkil dengan Kultur Trapping

2020 ◽  
Vol 2 (3) ◽  
pp. 38-48
Author(s):  
Safran Safran ◽  
Ashabul Anhar ◽  
Fikrinda Fikrinda
Keyword(s):  
Arbuscular Mycorrhizal Fungi ◽  
Palm Oil ◽  
Oil Palm ◽  
Mycorrhizal Fungi ◽  
Root Colonization ◽  
Arbuscular Mycorrhizal ◽  
Spore Density ◽  
Oil Palm Plantation

Abstrak. Penelitian ini dilakukan untuk mengeksplorasi fungi mikoriza arbuskula (FMA) pada perkebunan kelapa sawit PT Lembah Bhakti dengan kultur trapping. Populasi spora dan kolonisasi FMA pada akar kelapa sawit di amati pada kelapa sawit  umur 5 tahun, 10 tahun, dan 15 tahun dengan tiga media pembawa (zeolit, pasir dan biochar). Terdapat dua genus yang ditemukan pada rizosfir kelapa sawit yaitu Glomus dan Acaulospora. Glomus merupakan genus yang  dominan dan Glomus sp1 merupakan spesies yang lebih banyak. Hasil penelitian menunjukkan kepadatan spora tertinggi didapatkan pada rizosfer kelapa sawit umur 5 tahun ( 65 spora per 50g tanah) sedangkan kolonisasi akar tertinggi didapatkan pada umur 10 tahun (39,6 %). Zeolit merupakan media pembawa terbaik dalam kultur trapping yang ditunjukkan oleh lebih tingginya kepadatan spora maupun kolonisasi akar. bstract. This research was conducted to explore the arbuscular mycorrhizal fungi (AMF) at oil palm plantation of PT Lembah Bhakti with trapping culture. AMF Spore populations at colonization at the root of palm oil were observed in oil palm aged were observation at 5 years, 10 years, and 15 years with three carrier media (zeolite, sand and biochar).  There are two genera found Glomus and Acaulospora. Glomus was the dominant genus and Glomus sp1 was a larger species. The results showed that the highest spore density was found in the 5-year-old palm oil rizosphere (65 spores per 50g of land) while the highest root colonization was obtained at age 10 (39.6%). Zeolite was the best carrier in trapping culture which is shown by higher spore density and root colonization.  

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