Rôle des champignons mycorhiziens à arbuscules dans les mécanismes régissant la co-existence entre espèces végétales

Content Provider	Semantic Scholar
Author	Sanon, Arsène
Copyright Year	2005
Abstract	The composition of the aboveground flora is mainly determined by the soil microbial communities, particularly by arbuscular mycorrhizal fungi AMF. The aim of this study was to indicate the role of AMF in the soil colonisation processes by two plant species, Zornia glochidiata and Pennicetum pedicellatum. The mycorrhizal soil infectivity potential was determined in soil taken from the area where the majority of each plant species was growing. In the control group we used the soil taken from the area without plant species. The mycorrhizal dependency, germination rate and the growth of plant species cultivated together was estimated in controlled conditions, following P uptake, mycorrhized root fragments inoculation or by supply of organic matter. The results showed high mycorrhizal soil infectivity potential in soil taken from the area with the majority of Z. glochidiata. We also noticed high mycorrhizal dependency from these two plants. Legume Z. glochidiata developed close relation with AMF while grass P. pedicellatum preferred soil available P. The supply of organic matter had no effect on Z. glochidiata but significantly increased P. pedicellatum biomass. Succession of plants will, then, depend on AMF in soil. AMF will promote installation of plant species with high mycorrhizal dependency (i.e. legumes). These plants will enhance the amount of AMF inoculum and easily accessible nutrients in soil. Plants with low mycorrhizal dependency, as graminaceous species, will then be able to grow. Therefore, AMF have crucial role in maintenance of terrestrial ecosystems biodiversity and their productivity.
File Format	PDF HTM / HTML
Alternate Webpage(s)	http://horizon.documentation.ird.fr/exl-doc/pleins_textes/divers13-07/010040027.pdf
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article