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International Journal of Current Microbiology and Applied Sciences (IJCMAS)
IJCMAS is now DOI (CrossRef) registered Research Journal. The DOIs are assigned to all published IJCMAS Articles.
Index Copernicus ICI Journals Master List 2018 - IJCMAS--ICV 2018: 95.39 For more details click here
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National Academy of Agricultural Sciences (NAAS)
NAAS Score: *5.38 (2019)
[Effective from January 1, 2019]
For more details click here

ICV 2018: 95.39
Index Copernicus ICI Journals Master List 2017 - IJCMAS--ICV 2018: 95.39
For more details click here

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Original Research Articles

PRINT ISSN : 2319-7692
Online ISSN : 2319-7706
Issues : 12 per year
Publisher : Excellent Publishers
Email : editorijcmas@gmail.com / submit@ijcmas.com
Editor-in-chief: Dr.M.Prakash
Index Copernicus ICV 2018: 95.39
NAAS RATING 2020: 5.38

Int.J.Curr.Microbiol.App.Sci.2017.6(1): 733-746
DOI: http://dx.doi.org/10.20546/ijcmas.2017.601.087


Changes at the Rhizosphere Microbiota of the Sunflower –Orobanche cumana Wallr Pathosystem
Tsveta H. Hristeva1* and Iliya D. Denev2
1Tobacco and Tobacco Products Institute, Department of Plant Protection and Agriculture, 4018 Plovdiv, Bulgaria
2University of Plovdiv, Department of Plant Physiology and Molecular Biology,4000 Plovdiv, Bulgaria
*Corresponding author
Abstract:

The influence of two factors - "broomrape" and "soil type" on quantities of seven trophic groups of soil microorganisms (Autochthonous; Oligotrophic; Actinomycetes; Microscopic fungi; Ammonifying; Assimilating mineral nitrogen; Aerobic nitrogen-fixing bacteria of the genus Azotobacter) were determined. Soil samples for microbiological analysis were taken from the rhizosphere zone of plants in sunflower crops from two soil types (Haplic Vertisols and Chromic Cambisols), in phenological phases of sunflower and of broomrape - "flowering". Reduction the quantities on all investigated groups of microorganisms in the system (sunflower + broomrape) were observed. The average population density as a whole in the microbial communities with presence of broomrape decreased by over 65% compared with the density in the microbial communities at uninfected plants, in both soil types. The power of influence of the factor "broomrape" was less than that of factor "soil type", but distinctly and statistically proven. The presence of broomrape had the strongest impact to the group of microscopic fungi (50% of total variance). Structural changes in the distribution between the different trophic groups of microorganisms in the microbial communities have been established - an increase the shares of oligotrophic microorganisms, of assimilating mineral nitrogen microorganisms and of microscopic fungi.


Keywords: Rhizosphere microorganisms, microbial communities, sunflower, broomrape, relationships.
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How to cite this article:

Tsveta H. Hristeva, Iliya D. Denev. 2017. Changes at the Rhizosphere Microbiota of the Sunflower - Orobanche cumana Wallr Pathosystem.Int.J.Curr.Microbiol.App.Sci. 6(1): 733-746. doi: http://dx.doi.org/10.20546/ijcmas.2017.601.087