Biological control of cotton seedling diseases by fluorescent pseudomonas spp

2016 ◽  
Vol 22 (3) ◽  
pp. 398-407 ◽  
Author(s):  
ERDOĞAN Oktay; BÖLEK
Keyword(s):  
Biological Control ◽  
Cotton Seedling ◽  
Pseudomonas Spp ◽  
Fluorescent Pseudomonas ◽  
Seedling Diseases

scholarly journals Effect of Population Density of Pseudomonas fluorescens on Production of 2,4-Diacetylphloroglucinol in the Rhizosphere of Wheat

1999 ◽  
Vol 89 (6) ◽  
pp. 470-475 ◽  
Author(s):  
Jos M. Raaijmakers ◽  
Robert F. Bonsall ◽  
David M. Weller
Keyword(s):  
Biological Control ◽  
Population Density ◽  
Supporting Evidence ◽  
Pseudomonas Spp ◽  
Fluorescent Pseudomonas ◽  
Naturally Occurring ◽  
Rhizosphere Population ◽  
First Time ◽  
Take All

The role of antibiotics in biological control of soilborne pathogens, and more generally in microbial antagonism in natural disease-suppressive soils, often has been questioned because of the indirect nature of the supporting evidence. In this study, a protocol for high pressure liquid chromatography/mass spectrometry is described that allowed specific identification and quantitation of the antibiotic 2,4-diacetylphloroglucinol (Phl) produced by naturally occurring fluorescent Pseudomonas spp. on roots of wheat grown in a soil suppressive to take-all of wheat. These results provide, for the first time, biochemical support for the conclusion of previous work that Phl-producing fluorescent Pseudomonas spp. are key components of the natural biological control that operates in take-all—suppressive soils in Washington State. This study also demonstrates that the total amount of Phl produced on roots of wheat by P. fluorescens strain Q2-87, at densities ranging from approximately 105 to 107 CFU/g of root, is proportional to its rhizosphere population density and that Phl production per population unit is a constant (0.62 ng/105 CFU). Thus, Phl production in the rhizosphere of wheat is strongly related to the ability of the introduced strain to colonize the roots.

scholarly journals Natural Plant Protection by 2,4-Diacetylphloroglucinol-Producing Pseudomonas spp. in Take-All Decline Soils

1998 ◽  
Vol 11 (2) ◽  
pp. 144-152 ◽  
Author(s):  
Jos M. Raaijmakers ◽  
David M. Weller
Keyword(s):  
Biological Control ◽  
Plant Protection ◽  
Wheat Root ◽  
Washington State ◽  
Significant Suppression ◽  
Natural Plant ◽  
Specific Suppression ◽  
Pseudomonas Spp ◽  
Fluorescent Pseudomonas ◽  
Take All

Take-all decline (TAD) is a natural biological control of the wheat root disease “take-all” that develops in response to the disease during extended monoculture of wheat. The research to date on TAD has been mostly descriptive and no particular occurrence is yet fully understood. We demonstrate that root-associated fluorescent Pseudomonas spp. producing the antibiotic 2,4-diacetylphloroglucinol (Phl) are key components of the natural biological control that operates in TAD soils in Washington State (U.S.A.). Phl-producing Pseudomonas spp. were present on roots of wheat grown in TAD soils at or above the threshold population density required for significant suppression of take-all of wheat. The specific suppression that operates in TAD soils was lost when Phl-producing fluorescent Pseudomonas spp. were eliminated, and conducive soils gained suppressiveness to take-all when Phl-producing Pseudomonas strains were introduced via mixing in small amounts of TAD soil. Introduction of selected Phl-producing strains into take-all conducive soils provided control of take-all of wheat to a level similar to that obtained in the complementary TAD soils.

Biological control of ragi blast disease by chitinase producing fluorescent Pseudomonas isolates

2015 ◽  
Vol 7 (1) ◽  
pp. 63-71 ◽  
Author(s):  
Yogesh Kumar Negi ◽  
Deepti Prabha ◽  
Satyendra Kumar Garg ◽  
Jatinder Kumar
Keyword(s):  
Biological Control ◽  
Blast Disease ◽  
Fluorescent Pseudomonas
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