scholarly journals Antibacterial and biochemical activity of pseudoguaianolide sesquiterpenes isolated from Ambrosia maritima against plant pathogenic bacteria

2014 ◽  
Vol 50 (No. 2) ◽  
pp. 64-69 ◽  
Author(s):  
M.E.I. Badawy ◽  
S.A.M. Abdelgaleil ◽  
T. Suganuma ◽  
M. Fuji
Keyword(s):  
Antibacterial Activity ◽  
Pathogenic Bacteria ◽  
Sulfhydryl Group ◽  
Erwinia Carotovora ◽  
Variable Degree ◽  
Biochemical Activity ◽  
Plant Pathogenic Bacteria ◽  
Aerial Parts ◽  
Effective Compound ◽  
Significant Activation

Five pseudoguaianolide sesquiterpenes (neoambrosin, damsinic acid, damsin, ambrosin, and hymenin) isolated from the aerial parts of Ambrosia maritima were tested for their antibacterial activity against two plant pathogenic bacteria, Agrobacterium tumefaciens and Erwinia carotovora. The tested compounds exhibited variable degree of antibacterial activity against both tested bacteria as minimum inhibitory concentrations (MIC) ranged 90–520 mg/l. Neoambrosin showed the highest antibacterial activity among the tested sesquiterpenes with MIC values of 150 and 90 mg/l against A. tumefaciens and E. carotovora, respectively. On the contrary, hymenin was the least effective compound with MIC values of 520 and 310 mg/l against A. tumefaciens and E. carotovora, respectively. Neoambrosin, damsinic acid, and damsin caused significant reduction in sulfhydryl group content with the former being the most effective. The tested sesquiterpenes significantly inhibited polygalacturonase and pectin-lyase activities of A. tumefaciens and E. carotovora except for hymenin which caused a significant activation of E. carotovora enzymes.  

scholarly journals The Antibacterial Activity of Chitosan Products Blended with Monoterpenes and Their Biofilms against Plant Pathogenic Bacteria

Scientifica ◽  
2016 ◽  
Vol 2016 ◽  
pp. 1-10 ◽  
Author(s):  
Mohamed E. I. Badawy ◽  
Entsar I. Rabea ◽  
Nehad E. M. Taktak ◽  
Mahmoud A. M. El-Nouby
Keyword(s):  
Antibacterial Activity ◽  
Pathogenic Bacteria ◽  
Biological Activities ◽  
Average Molecular Weight ◽  
Erwinia Carotovora ◽  
Food Protection ◽  
Plant Pathogenic Bacteria ◽  
Agar Dilution ◽  
Microbial Attack

This study focuses on the biological activities of eleven chitosan products with a viscosity-average molecular weight ranging from 22 to 846 kDa in combination with the most active monoterpenes (geraniol and thymol), out of 10 tested, against four plant pathogenic bacteria,Agrobacterium tumefaciens,Erwinia carotovora,Corynebacterium fascians, andPseudomonas solanacearum. The antibacterial activity was evaluatedin vitroby the agar dilution technique as a minimum inhibitory concentration (MIC) that was found to be dependent on the type of the microorganism tested. The most active product of chitosan was used for biofilm production enriched with geraniol and thymol (0.1 and 0.5%) and the films were also evaluated against the tested bacteria. The biological bioactivities summarized here may provide novel insights into the functions of chitosan and some monoterpenes and potentially allow their use for food protection from microbial attack.

scholarly journals In vivo and in vitro antibacterial activity of neomycin against plant pathogenic bacteria

2011 ◽  
Vol 6 (34) ◽  
pp. 6829-6834, ◽  
Author(s):  
Tao Ke ◽  
Fan Jieyu ◽  
Shi Guanying ◽  
Zhang Xingang ◽  
Zhao Haoyu ◽  
...  
Keyword(s):  
Antibacterial Activity ◽  
Pathogenic Bacteria ◽  
Plant Pathogenic Bacteria ◽  
In Vitro Antibacterial Activity

scholarly journals Gc-Ms Analysis and Antibacterial Activity of Mangosteen Leaf Extracts against Plant Pathogenic Bacteria

2016 ◽  
Vol 07 (07) ◽  
pp. 1013-1020 ◽  
Author(s):  
Qamar Mohammed Naji Alsultan ◽  
Kamaruzaman Sijam ◽  
Tavga Sulaiman Rashid ◽  
Khairulmazmi Bin Ahmad
Keyword(s):  
Antibacterial Activity ◽  
Pathogenic Bacteria ◽  
Leaf Extracts ◽  
Plant Pathogenic Bacteria ◽  
Ms Analysis

Antibacterial activity of caffeine against plant pathogenic bacteria

2015 ◽  
Vol 62 (3) ◽  
pp. 605-612 ◽  
Author(s):  
Wojciech Sledz ◽  
Emilia Los ◽  
Agnieszka Paczek ◽  
Jacek Rischka ◽  
Agata Motyka ◽  
...  
Keyword(s):  
Antibacterial Activity ◽  
Pathogenic Bacteria ◽  
Plant Pathogenic Bacteria

Chemotaxis of some phytopathogenic bacteria to fungal propagules in vitro and in soil

1988 ◽  
Vol 34 (2) ◽  
pp. 196-199 ◽  
Author(s):  
W. C. Lim ◽  
J. L. Lockwood
Keyword(s):  
Pseudomonas Syringae ◽  
Xanthomonas Campestris ◽  
Pathogenic Bacteria ◽  
Erwinia Carotovora ◽  
Bipolaris Sorokiniana ◽  
Macrophomina Phaseolina ◽  
Plant Pathogenic Bacteria ◽  
Fungal Propagules ◽  
Xanthomonas Campestris Pv Campestris

The motile plant pathogenic bacteria Erwinia carotovora pv. carotovora, Pseudomonas syringae pv. phaseolicola, and Xanthomonas campestris pv. campestris were strongly attracted to conidia of Bipolaris sorokiniana, B. victoriae, and to sclerotia of Macrophomina phaseolina and their exudates in vitro and in soil, but not to phosphate buffer or buffer–soil mixtures. Bacteria accumulated radioactivity within 1 h after being placed in exudates from 14C-labelled conidia of B. sorokiniana. After 5 h, radioactivity of the 14C-labelled exudate was reduced to 29–54% of that in the original medium. Exudates from fungal propagules may act as attractants and substrates for motile plant pathogenic bacteria in soil.

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