Indigenous Rhizobacteria treatment in controlling diseases Phytophthora palmivora and increasing the viability and growth of cocoa seedling

Abstract

Rhizobacteria play a positive role as biocontrol agents as well as Plant Growth Promoting Rhizobacteria (PGPR) agents. The research objective was to obtain indigenous rhizobacteria isolates on cocoa plants that have the potential to inhibit the attack of P. palmivora fungal pathogens, and act as PGPR in vitro and in vivo. The results of the study concluded that isolates TRI 7/1, TRI 8/8, GM 7/9 and GM 7/10 had the highest ability to inhibit the growth of pathogen. The lowest disease severity (20%) was obtained in the seedlings treated using isolates TRI 7/1 and TRI 8/8. Rhizobacterial isolates GM 3/6, GM 5/6, GM 7/9 and GM 8/8 produce high amounts of IAA. Rhizobacteria isolates GM 5/6, GM 7/9 and GM 8/8 has very high peroxidase enzyme activity. High production of HCN compounds was obtained in rhizobacteria isolates TRI 3/3, TRI 4/10 and TRI GM 8/11. All rhizobacterial isolates gave an increase in the value of maximum growth potential, germination and vigor values for growth strength compared with the control. The rizobacteria treatments using isolates TRI 7/1, TRI 8/8, GM 7/9 and GM 7/10 were able to increase plant height, stem diameter and number of leaves at 30, 40, 50, 60, and 70 DAP compared to control treatment.

BioNanotecnología aplicada al cultivo de Theobroma cacao L

“…En el cultivo de cacao se han empleado microorganismos biocontroladores capaces de inhibir el crecimiento de fitopatógenos (Syamsuddin et al, 2021., Larbi-Koranteng et al, 2020., Ferraz et al, 2019. Se ha reportado especialmente el uso del género Trichoderma y Clonostachys, los cuales generan una relación simbiótica con el huésped.…”

The effect of plant growth promoting Rhizobacteria treatment on germination and seedlings growth of chilli

“…Two rhizobacteria isolates (Lysinibacillus varians and P. putida) produced IAA and dissolved phosphate, thereby increasing chili germination, plant height, number of leaves, root length, wet weight, and plant dry weight [46]. Four isolates were able to boost the plant height, stem diameter and number of cocoa leaves; these isolates also produce IAA and peroxidase enzyme as the PGPR activity [47]. Five rhizobacteria isolates i.e Azotobacter sp., B. megaterium, B.coagulants, Flavobacterium sp., and P. atmuta, are relatively effective to increase the plant height, stem diameter, and the number of chili fruit [48].…”

Effect of Soaking with Plant Growth Promoting Rhizobacteria on Rice Seed Germination

“…This rhizobacteria isolate can stimulate plant growth, or what is known as Plant Growth Promoting Rhizobacteria (PGPR) [3]. These rhizobacteria can be found in the plant rhizosphere, which is the thin layer of soil that covers plant roots and has a positive impact on plant growth [4]. In general, the mechanism of PGPR in increasing plant growth involves the ability of PGPR to produce or change the concentration of plant hormones such as indoleacetic acid (IAA), gibberellic acid, cytokinins, and ethylene, as well as their precursors (1-aminocyclopropene-1-carboxylic deaminase) in plants.…”