Record ID No. |
3733 |
Author(s) |
Godar Sene, Ramatoulaye Samba-Mbaye, Mansour Thiao, Damase Khasa, Aboubacry Kane, Anicet Manga , Mame Samba Mbaye, Samba Ndao Sylla , 2012 |
Affiliation |
Laboratoire Commun de Microbiologie LCM IRD/ISRA/UCAD, Bel-Air BP 1386, CP 18524, Dakar, Sénégal |
Title |
The abundance and diversity of legume-nodulating rhizobia and arbuscular mycorrhizal fungal communities in soil samples from deforested and man-made forest systems in a semiarid Sahel region in Senegal |
Source. Vol.(no):Page |
European Journal of Soil Biology, 52: 30-40p. |
Categories |
Arbuscular Mycorrhiza |
Subjects |
Soil plant relations |
Sub-subjects |
Plantations |
Host |
Trees |
Organism |
Rhizobia, Bradyrhizobium, Mesorhizobium, Sinorhizobium, Gigaspora |
Country |
Senegal, Europe |
Abstracts |
Exotic and native tree species have been widely used in the West Africa to reverse the tendency of land
degradation. Although benefic effects have been reported on soil stabilization, a lack of information
about their impact on soil symbiotic microorganisms still remains. This investigation has been carried
out in a semiarid Sahel region and aimed to survey the abundance and diversity of natural legumenodulating
rhizobia (LNR) and arbuscular mycorrhizal (AM) fungal communities in soil samples from deforested and man-made forest systems. A genetically diverse LNR population is supported by the phylogenetic analysis, which clustered the isolates into three genera: Bradyrhizobium, Mesorhizobium and Sinorhizobium. The results showed that the man-made forest systems increased the LNR abundance and
genetic diversity as well as the soil phosphorus and nitrogen contents. By contrast, strong modifications
have been recorded in the characteristics of the AM fungal communities. The number of AM fungus taxa as well as the mycorrhizal inoculum potential (MIP) of soils decreased drastically in the man-made forest systems in comparison with the deforested land. In addition, the larger-spored AM fungi (Scutellospora
and Gigaspora) were specifically found in soil samples from the deforested land. The displacement of
larger-spored species was associated with a concomitant proliferation of small spored (Glomus) species.
We conclude that man-made forestry can modify the soil symbiotic microorganisms and the results
support the need for further adoption of management practices that could improve or sustain the development of herbaceous layers to promote the soil AM fungal communities. |