Saudi Journal of Pathology and Microbiology (SJPM)
Volume-3 | Issue-01 | 5-15
Original Research Article
Impact of PGPM in Pepper Immune-Response to Fusarium Wilt Disease
Ayman F. Ahmed, Mohamed S. Attia, Fatma Faramawy, Mahmoud M. Salaheldin
Published : Jan. 30, 2018
Abstract
Plant growth promoting microorganisms (PGPM) are the rhizosphere
bacteria and Vesicular Arbuscular Mycorrhizal spores (VAM) that enhance plant
growth and suppress plant diseases.The current study was carried out at Ahmed Orabi
Agricultural Cooperative Association, Ismailia, Egypt, to investigate the efficient
antagonistic bacterial isolates and VAM against Fusarium wilt disease in pepper plant
under filed experiment. A total of 49 bacterial isolates were isolated, out of which 4
(P1, P11, P19 and P42) were selected based on their antagonism of phytopathogens.
Phylogenetic analysis of 16SrRNA sequences identified these isolates as new strains
of Bacillus subtilis, Bacillus aerius, Achromobacter xylosoxidans and Lysinibacillus
fusiformis. The selected isolates produced high levels siderophore and hydrogen
cyanide. Disease symptoms, disease index percent, phytochemicals and Metabolic
indicators of resistance in plant as response to induction of systemic resistance (SR) in
pepper plants were recorded. VAM and P42 were the best isolates and reduced
percent disease indexes by 10 and 15 % respectively. P11, and PGPR (P1, P11, P19,
P42) gave the same result 17.5%. and came next P19, (VAM+PGPR) and P1 which
recorded 20,22.5and 30 % respectively. The beneficial effects of the used elicitors
were extended to increase not only total phenol, total soluble protein content but also
the activities of peroxidase and polyphenoloxidase enzymes in comparison with
control. At the same time, the results appeared that pepper infected plants treated with
applied elicitors showed variation in number, molecular weight of protein bands as
well as variability in number of polypeptide peroxidase and polyphenol oxidase
isozymes in the leaves.