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Microbiology: Current Research 2017 | Volume 1, Issue 2
Joint Conference
GLOBAL APPLIED MICROBIOLOGY CONFERENCE
MICROBIAL & BIOCHEMICAL RESEARCH AND TECHNOLOGIES
October 18-19, 2017
Toronto, Canada
International Congress on
&
Rhizobial inoculation increases soil microbial functioning and gum Arabic production of 13-years old
Senegalia senegal
(L.) Britton trees in the north part of Senegal
Dioumacor Fall
1, 2, 3
, Niokhor Bakhoum
2, 3
, Saïdou Nourou Sall
4
, Alzouma Mayaki Zoubeirou
5
, Samba Ndao Sylla
2, 6
and
Diégane Diouf
2, 3, 6
1
ISRA, Senegal
3
LMI-LAPSE, Senegal
4
Université Gaston Berger, Senegal
5
Université Abdou Moumouni, Niger
6
Université Cheikh Anta Diop, Senegal
R
hizobial inoculation has been widely used in controlled
conditions as a substitute for chemical fertilizers to
increase plant growth and productivity. However, very little
is known about such effects on mature trees in natural
habitats. In this study, we investigated the effect of rhizobial
inoculation on soil total microbial biomass, mineral nitrogen
content, potential CO2 respiration, fluorescein diacetate
(FDA), acid phosphatase activities and gum arabic production
by 13-years old
Senegalia senegal
(
Syn. Acacia senegal
)
under natural conditions in the north part of Senegal during
two consecutive years. Rhizobial inoculation was performed
at the beginning of the rainy season (July) for both years
with a cocktail of four strains (CIRADF 300, CIRADF 301,
CIRADF 302 and CIRADF 303). Rhizospheric soils were
collected in both dry and rainy seasons to a depth of 0-25
cm under uninoculated (UIN) and inoculated (IN) trees. Trees
were tapped in November (beginning of dry season) using
traditional tools. Gum arabic was harvested every 15 days
from December to March. The results obtained from both
years demonstrated that rhizobial inoculation increased
significantly the percentage of trees producing gum arabic,
gum arabic production per tree, soil microbial biomass, FDA
and acid phosphatase activities. However, there was no
significant effect on Cmineralization andmineral nitrogen (N)
content. Gum arabic production was positively correlated to
rainfall, soil microbial biomass and mineral nitrogen content.
Our results showed a positive effect of rhizobial inoculation
on soil microbial functioning and gum arabic production by
mature
S. senegal trees
. These important findings deserve to
be conducted in several contrasting sites in order to improve
gum arabic production and contribute to increase rural
population incomes.
Speaker Biography
Dioumacor Fall completed his PhD in 2009 from Cheikh Anta DIOP University
(Dakar-Senegal). He pursued his Post-doctoral studies at the Common Laboratory
of Microbiology IRD/ISRA/UCAD in Dakar. He joined the Senegalese Institute of
Agricultural Research (ISRA) as a Researcher in 2011. His work focuses on plant-
microorganism-environment interactions and how they can contribute to improve
plants production particularly in a climate change context. He is working as the Head
of the Microbiology Laboratory of the National Center for Forestry Research (CNRF) at
ISRA. He has more than 23 peer-reviewed publications.
e:
dioumacor.fall@isra.sn