Timing Pseudomonas chlororaphis applications to control Pythium aphanidermatum, Pythium dissotocum, and root rot in hydroponic peppers

Fungal and oomycete populations and their dynamics were investigated following the introduction of the biocontrol agent Pythium oligandrum into the rhizosphere of tomato plants grown in soilless culture. Three strains of P. oligandrum were selected on the basis of their ability to form oospores (resting structures) and to produce tryptamine (an auxin-like compound) and oligandrin (a glycoprotein elicitor). Real-time PCR and plate counting demonstrated the persistence of large amounts of the antagonistic oomycete in the rhizosphere throughout the cropping season (April to September). Inter-simple-sequence-repeat analysis of the P. oligandrum strains collected from root samples at the end of the cropping season showed that among the three strains used for inoculation, the one producing the smallest amount of oospores was detected at 90%. Single-strand conformational polymorphism analysis revealed increases in the number of members and the complexity of the fungal community over time. There were no significant differences between the microbial ecosystems inoculated with P. oligandrum and those that were not treated, except for a reduction of Pythium dissotocum (ubiquitous tomato root minor pathogen) populations in inoculated systems during the last 3 months of culture. These findings raise interesting issues concerning the use of P. oligandrum strains producing elicitor and auxin molecules for plant protection and the development of biocontrol.

show abstract

“…Biocontrol strategies are promising (7,35). However, both biotic and abiotic factors may affect the performance of biocontrol methods.…”

mentioning

confidence: 99%

Influence of Pythium oligandrum Biocontrol on Fungal and Oomycete Population Dynamics in the Rhizosphere

Vallance

Floch

Déniel

et al. 2009

Appl Environ Microbiol

View full text Add to dashboard Cite

show abstract

“…In red pepper, Pseudomonas and Bacillus species of rhizospheres have been used to diminish P. capsici. Various bacterial strains are responsible for the production of a large number of antibiotics that show antifungal activity and are antagonistic to different fungal diseases such as sheath blight, root rot and stem rot (Chatterton et al, 2004).…”

Section: Biocontrol Of Phytophthora Capsicimentioning

confidence: 99%

Phytophthora capsici on chilli pepper (Capsicum annuum L.) and its management through genetic and bio-control: a review

Majid

Awan

Fatima³

et al. 2016

Zemdirbyste-Agriculture

View full text Add to dashboard Cite

Phytophthora capsici is the most destructive pathogen of vegetables that represents a serious threat to chilli pepper plants. We discussed the control of P. capsici through manipulation of genetic architecture of chilli plant and endophytic microorganisms. The function of various genes encoding transcriptional regulatory and defense related putative proteins such as pathogen-related protein (PR), anti-microbial peptides (AMPs), polygalacturonaseinhibiting proteins (PGIPs), lipid transfer protein (LTP), pectin methylesterase (PME), leucine-rich repeat proteins (LRRs), osmotin-like and thaumatin-like protein, in Capsicum was also analyzed. The bio-control of P. capsici by using various strains of Bacillus, Trichoderma, Pseudomonas, Chryseobacterium and Rhizobacteria was demonstrated. We also discussed the enhanced resistance to P. capsici infection by treatment with a variety of abiotic and biotic inducers that act on defence signalling pathways involved in disease resistance. We highlighted the vulnerability of chilli crop with reference to its genetic resources against Phytophthora blight. Disease control through chemicals is becoming problematic, so we proposed other ways to control the disease severity. This review highlights the economic significance of chilli pepper (Capsicum annuum L.) along with disease management strategies against P. capsici. This pathogen has posed a serious threat to chilli crop worldwide.

show abstract

“…Therefore, rhizosphere competence is considered as a prerequisite of effective biological control. Understanding root-microbe communication [30,51], as affected by genetic [66] and environmental [62] determinants in spatial [30] and temporal [70] contexts, will significantly contribute to improve the efficacy of these biocontrol agents. Once biocontrol agents establish on the site, the mechanism of antagonism might be competition for nutrients, space, siderophore production [41], antibiosis [18], production of hydrolytic enzymes or other active substances.…”

Section: Root Colonization and Protection Of Infection Sitesmentioning

confidence: 99%

Management of Plant Pathogens with Microorganisms

Singh¹

2014

Proceedings of the Indian National Science Academy

View full text Add to dashboard Cite

Timing Pseudomonas chlororaphis applications to control Pythium aphanidermatum, Pythium dissotocum, and root rot in hydroponic peppers

Cited by 44 publications

References 22 publications

Influence of Pythium oligandrum Biocontrol on Fungal and Oomycete Population Dynamics in the Rhizosphere

Influence of Pythium oligandrum Biocontrol on Fungal and Oomycete Population Dynamics in the Rhizosphere

Phytophthora capsici on chilli pepper (Capsicum annuum L.) and its management through genetic and bio-control: a review

Management of Plant Pathogens with Microorganisms

Contact Info

Product

Resources

About