FLUORESCENT PSEUDOMONADS AS PLANT GROWTH PROMOTERS AND BIOCONTROL OF ROOT-INFECTING PATHOGENS ON MAIZE PLANT
OSAMA ELSAYED MOHAMED;
Abstract
Findings obtained throughout current study can be summarized as follows:
1. Total numbers of 110 rhizobacterial fluorescent pseudomonad isolates were recovered from the rhizosphere of maize and sugar beet.
2. Twenty four out of these isolates were found to have the potency to antagonize two major root-infecting pathogens of maize in vitro. These pathogens are: Cephalosporium maydis and Fusarium verticillioides. In pot experiment, four bacterial isolates were shown to be effective in reducing infection with each of the target pathogens.
3. Biochemical tests classified tentatively these efficient organisms as species of fluorescent pseudomonads.
4. Based on the genotypic identifications, they could be identified as Pseudomonas putida (Pau9), P .putida (Pau11), P. putida (Psf3) and P. aeruginosa (Psf9).
5. Extracellular enzymes produced by these efficient strains were assayed and found that cellulase and chitinase as the most important enzymes that can affect the pathogenesis were actively produced by most of these strains. Cellulase, however was found to be produced only by P. aeruginosa Psf9. Whereas, Chitinase was detected in growing media of the tested strains, except P. putida Pau11.
6. Study the antibiosis revealed that phenazine was the only
1. Total numbers of 110 rhizobacterial fluorescent pseudomonad isolates were recovered from the rhizosphere of maize and sugar beet.
2. Twenty four out of these isolates were found to have the potency to antagonize two major root-infecting pathogens of maize in vitro. These pathogens are: Cephalosporium maydis and Fusarium verticillioides. In pot experiment, four bacterial isolates were shown to be effective in reducing infection with each of the target pathogens.
3. Biochemical tests classified tentatively these efficient organisms as species of fluorescent pseudomonads.
4. Based on the genotypic identifications, they could be identified as Pseudomonas putida (Pau9), P .putida (Pau11), P. putida (Psf3) and P. aeruginosa (Psf9).
5. Extracellular enzymes produced by these efficient strains were assayed and found that cellulase and chitinase as the most important enzymes that can affect the pathogenesis were actively produced by most of these strains. Cellulase, however was found to be produced only by P. aeruginosa Psf9. Whereas, Chitinase was detected in growing media of the tested strains, except P. putida Pau11.
6. Study the antibiosis revealed that phenazine was the only
Other data
| Title | FLUORESCENT PSEUDOMONADS AS PLANT GROWTH PROMOTERS AND BIOCONTROL OF ROOT-INFECTING PATHOGENS ON MAIZE PLANT | Other Titles | مجموعة السيدوموناس الفلورسنتية كمنشطات للنمو ومقاوم حيوى لممرضات الجذور لنبات الذرة الشامية | Authors | OSAMA ELSAYED MOHAMED | Issue Date | 2019 |
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