World Journal of
Pharmaceutical and Life Sciences

AL-JOUF REGION OLIVE TREES RHIZOSPHERIC BACTERIA: ENUMERATION, PHENOTYPIC DIVERSITY, AND AMYLASE SCREENING

Ben Amar Cheba*

ABSTRACT

This preliminary bacteriological study of some Al-Jouf region olive trees rhizospheres aimed to investigate their phenotypic bacterial diversity and amylase productivity. The results of olive cultivar age effect on total rhizospheric bacteria were very low in seedlings compared to the adult threes, and generally variable according to the following descending order Barri > Sorani > Romani > Russaei. Concerning olive cultivars genotype effect on total rhizospheric bacteria, the results revealed on variable total rhizospheric bacteria associated with investigated cultivars, according to the following descending order Barri (68.4 %) > Picual (23.5%) > Arbosana (7 %) > Chetoui (1%), whereas the results of olive rhizospheric bacteria phenotypic diversity were variable according to the following descending order Arbosana > Chetoui > Picual >Barri. The phenotypic diversity was characterized by variations in colonies color, size, form, elevation, edges, and texture, with the dominance of pinpoint and red colonies in Arbosana and Picual cultivars respectively, whereas Chetoui cultivar distinguished with brown pigment diffusing colonies, which may be indicated siderophores secretion. In addition, amylase screening results showed the superiority of Chemchali and Chetoui cultivars as efficient sources for amylase-producing bacteria which can be exploited for further biotechnological applications.

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