Caractérisation des rhizobactéries potentiellement promotrices de la croissance végétative du maïs dans différents agrosystèmes du Sud-Bénin

Abstract

Tel ; (+229)97123468 RESUME L'objectif de cette étude est de caractériser les rhizobactéries potentiellement promotrices de la croissance végétative ou encore en anglais « plant growth promoting rhizobacteria» (PGPR) vivant dans la rhizosphère de douze (12) différentes zones agroécologiques du sud-Bénin. Un échantillon composite de sol et de racines des plants de maïs est prélevé au niveau de 4 différents champs de producteurs par zone agroécologique. Des analyses agrochimiques et microbiologiques sont faites sur ces échantillons. Les résultats montrent que la flore totale des sols étudiés est riche en rhizobactéries. Quinze (15) espèces de PGPR différentes sont identifiées à de fortes concentrations dans tous les échantillons de sols et de racines. Il s'agit de trois espèces de Pseudomonas, trois espèces de Streptomyces, huit espèces de Bacillus et une espèce de Azospirillium. Les sols du sud-Bénin contiennent naturellement des rhizobactéries potentiellement promotrices de croissance végétative. Il ne se dégage pas de lien entre les propriétés chimiques des sols des différentes zones d'étude et la distribution des rhizobactéries PGPR.

Response of maize (Zea mays L.) crop to biofertilization with plant growth promoting rhizobacteria and chitosan under field conditions

“…The study conducted by Aliye et al (2008) has shown that P. fluorescens (strains PF9 and PF20) are responsible to increase the biomass of potato plants (Solanum tuberosum). The biomass improvements obtained in present study are greater than those obtained by Adjanohoun et al (2011). Indeed, Adjanohoun et al (2011) have registered an increase of 59.57% of the aerial biomass, induced by rhizobacteria P. fluorescens.…”

“…The biomass improvements obtained in present study are greater than those obtained by Adjanohoun et al (2011). Indeed, Adjanohoun et al (2011) have registered an increase of 59.57% of the aerial biomass, induced by rhizobacteria P. fluorescens. This difference is due to beneficial effects of chitosan that are added to PGPR effects.…”

“…The rhizobacterial strain used (A. lipoferum, P. fluorescens and P.putida) were isolated from the rhizosphere of maize plants in southern Benin (West Africa). These microorganisms were taxonomically isolated and characterized by Adjanohoun et al (2011). These strains were stored at -20°C in Muller Hinton broth supplemented with glycerol (10%) at Laboratory of Biology and Microbiological Molecular Typing (University of Abomey-Calavi, Benin).…”

Characterization of Potential Plant Growth Promoting Rhizobacteria Isolated from Maize (Zea maysL.) in Central and Northern Benin (West Africa)

“…It is in this context that this prospective study was realized in prelude of the promotion of microbial biofertilizers based on native rhizobacteria. The agroecological characteristics of sites samples collected were presented in Table 1 [26]. Indeed, our result reflects the large soils diversity in Benin as Adjanohoun et al [26] reported other types of soil such as Vertisols, Degraded Bar Land, and No Degraded Bar Land.…”

“…These crops are rice, sorghum, small millet, millet, cotton, bean, cowpea, cassava, bambara groundnut, yam, and pimento. In southern Benin, except maize, Adjanohoun et al [26] had identified cotton, groundnut, sweet potato, cowpea, and cassava. These cultures were mostly found in northern and central Benin.…”