Abstract:
Because of its mycotrophic caracter, and its capability to live in the steppic environment, the olive tree
is the host in this symbiosis. In this work, the variation of mycorrhization parameters : mycorrhizal
frequency in the root system (F%), Intensity of mycorrhizal colonisation in the root system (M%),
Intensity of mycorrhizal colonisation in root fragments (m%), Abundance of arbuscules in the
mycorrhizal parts of root fragments (a%), Abundance of arbuscules in the root system (A%) are
studied in two different age groups, in order to understand the differences in this case for the
establishment of the symbiosis in this species. The physico-chemical properties of soils (pH, electric
conductivity, organic matter,total limestone amount and active limestone) were determined for the two
age groups.The study shows The frequency of mycorrhization is equal in the two groups unlike the
other parameters, the adult group had the highest amount of the M%, m%, a%, A%. parameters
Description:
after studying the root fungal symbiosis in the olive tree Olea europaea on two
different age groups in the steppe, mycorrhizal fungi are observed in both age groups.
Identical structures were detected in the treated root fragments through the use of optical
microscopy. Our study showed that the frequency (F%) of fungal infection was same between
the two age groups. Otherwise, the mycorrhizal colonisation in the root system (M%) and in
the root fragments (m%) was different, same observation about the arbuscule abundance in
mycorrhizal parts of root system (A%) and in the root fragments (a%). This variation could
be due to the age of the tree. All mycorrhization parameters of adult trees are almost twice as
high compared to young plants.
At the end, it becomes evident that there is potential for further exploration of this aspect.
Certainly the importance of transferring these resilient species rather than relying on synthetic
chemicals and nutrients is crucial.
Algeria has strongly encouraged the development of olive growing throughout the national
territory. However, the presence of mycorrhizal symbiosis on the olive tree and particularly in
the steppe is essential because it is an indicator of resilience to the climatic and edaphic
conditions of this zone. Better yet, the older the plant gets, the more mycorrhiza it has in its
root system. Hence the interest of this study which should contribute to helping the research
community and farmers in this region.
