tailieunhanh - Báo cáo lâm nghiệp: "Arbuscular mycorrhizal colonization of vascular plants from the Yungas forests, Argentin"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp Original article đề tài: Arbuscular mycorrhizal colonization of vascular plants from the Yungas forests, Argentina. | Ann. For. Sci. 64 2007 765-772 INRA EDP Sciences 2007 DOI forest 2007056 Available online at Original article Arbuscular mycorrhizal colonization of vascular plants from the Yungas forests Argentina Alejandra BECERRAa Marta CABELLOb Franco CHlARlNla a Instituto Multidisciplinario de Biología Vegetal CONICET-UNC. . 495. 5000 Córdoba República Argentina b Instituto Spegazzini Facultad de Ciencias Naturales y Museo Avenida 53 N 477 1900 La Plata República Argentina Received 21 November 2006 accepted 7 June 2007 Abstract - In Argentina the Yungas forests are among the ecosystems most affected by human activity with loss of biodiversity. To assess the mycorrhizal status in these ecosystems the roots of 41 native plant species belonging to 25 families were collected throughout the year from two sites of the Yungas forests. Roots were washed and stained to study the presence of arbuscular mycorrhizas AM . Morphological types of arbuscular mycorrhizas Arum and Paris-type and colonization patterns were identified and photographed. All plants presented AM colonization. The AM colonization patterns varied from single intracellular aseptate hyphae coils appresoria to vesicles and or arbuscules. Among the species studied the Paris-type colonization showed to be dominant. Results confirmed that AM hosts are predominant in the Yungas of South American forests. Yungas arbuscular mycorrhizal Arum-type Paris-type Alnus forests Résumé - Colonisation par les mycorhizes arbusculaires dans des plantes vasculaires des forêts des Yungas Argentine. En Argentine les Yungas constituent un des écosystèmes les plus atteints par l activité de l homme avec la perte de biodiversité qui en découle. Pour évaluer le statut mycorhizien de ces écosystèmes les racines de 41 plantes autochtones appartenant à 25 familles ont été collectées au cours de l année dans deux sites des forêts des Yungas. Les racines ont été lavées et teintes afin de déterminer la présence des .