Inhibition and dispersion of biofilms in plants with imidazole-triazole derivatives

Inactive Publication Date: 2011-12-01
NORTH CAROLINA STATE UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0039]Also provided are methods of enhancing the effects of a plant defense activator comprising applying an active compound selected from the group consisting of compounds of Formula (I), Formula (I)(a)(1), Formula (I)(b)(1), Formula (I)(a)(2), Formula (I)(b)(2), Formula (I)(i), Formula (I)(i)(a), Formula (II), Formula (II)(a), Formula (II)(i), Formula (II)(i)(a), Formula (III), Formula (III)(a), Formula (III)(b), Formula (III)(b)(i), Formula (III)(b)(ii), Formula (IV), Formula (IV)(a), Formula (IV)(i), Formula (IV)(i)

Problems solved by technology

All of these crops are affected in a deleterious manner by biofilm formation.
In addition, other valuable plants such as

Method used

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  • Inhibition and dispersion of biofilms in plants with imidazole-triazole derivatives
  • Inhibition and dispersion of biofilms in plants with imidazole-triazole derivatives
  • Inhibition and dispersion of biofilms in plants with imidazole-triazole derivatives

Examples

Experimental program
Comparison scheme
Effect test

example 1

Synthesis of 2-aminoimidazole-triazole (2-AIT) Chemical Library

[0334]There is a paucity of reactions that have been reported to be compatible with 2-aminoimidazoles. To test the applicability of the Cu(I)-catalyzed [3+2] alkyne / azide cycloaddition (Click reaction, see Kolb et al., Angewandte Chemie-International Edition 2001, 11, 2004-2021; Rodionov et al., Angewandte Chemie-International Edition 2005, 15, 2210-2215), we synthesized the alkyne derived 2-aminoimidzole 1 and tested its ability to participate in a Cu(I)-catalyzed [3+2] cycloaddition with benzyl azide.

[0335]The alkyne derived 2-aminoimidazole (2-AI) was synthesized as outlined in Scheme 1. Amino acid 2 (Kotha et al., Tetrahedron 2002, 45, 9203-9208) was subjected to small scale Akabori reduction (Akabori, Berichte Der Deutschen Chemischen Gesellschaft 1933, 66, 151-158), which, followed by condensation with cyanamide (Xu Yz et al., J Org Chem 1997, 3, 456-464) delivered the target alkyne 2-AI 1 in 88% yield. With 1 in h...

example 2

Activity Testing of 2-AIT Library Members

[0392]A standard crystal violet reporter assay is employed to assess the effect of compounds from the 2-amino on the formation of biofilms. Among others, the following strains are tested:

[0393]Xanthomonas Xccl

[0394]Xanthomonas Xcv.135

[0395]Xanthomonas Xcv5

[0396]Xanthomonas Xccp

[0397]Xanthomonas Xcp60

[0398]Xanthomonas Xcp25

[0399]Ralstonia solanacearum K66

Xanthomonas is a Gram-negative rod-shaped bacterium that is a common plant pathogen. Xanthomonas bacteria grow almost exclusively in plants. Xanthomonas species testing includes X. vesicatoria (crop=tomato), X. euvesicatoria (crop=pepper), X. campestris (crop=crucifers, particularly cabbage), X. zinniae (crop=zinnia), and X. fragariae (crop=strawberry). Ralstonia solanacearum is a Gram-negative bacterium that is found in soil.

[0400]Bacteria are allowed to form biofilms in a multi-well plate in the absence or presence of one or more compounds. Planktonic (or free growing) bacteria are then remo...

example 3

Activity Testing of 2-AIT Library Members on Xanthomonas

[0401]Biofilm formation on PVC microtiter wells was accomplished using Xanthomonas strains Xcv 135 (known to infect peppers and tomatoes) and Xcv 5 (known to infect tomatoes but not peppers) as models. The Starting Optical Density (OD at 600 nm) for biofilm attachment assay was 0.55, the temperature for this assay was 28° C., the duration of incubation was 6 hours under, and the assay was static.

[0402]Biofilm inhibition results are as follows for screens with Xcv 135. The Xcv 5 strain is tested in the same manner.

Compound Screened% Inhibition at 20 μM (vs. Xcv 135)Formula (II)(a)(5)(D)86%Formula (II)(a)(6)(D)85%Formula (II)(i)(a)(2)(J) 0%

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Abstract

Disclosure is provided for methods of preventing, removing or inhibiting microbial biofilm formation or microbial infection in a plant or plant part thereof, including applying thereto a treatment effective amount of an active compound as described herein, or an agriculturally acceptable salt thereof. Methods of enhancing a microbicide (e.g., including a copper, antibiotic, bacteriophage, etc.) and/or plant defense activator are also provided, including applying an active compound as described herein. Compositions comprising an active compound as described herein in an agriculturally acceptable carrier are also provided, and in some embodiments the compositions further include a microbicide (e.g., including copper, antibiotic, bacteriophage, etc.) and/or plant defense activator.

Description

RELATED APPLICATIONS [0001]This application claims the benefit under 35 U.S.C. §119(e) of U.S. Application No. 61 / 120,661, filed Dec. 8, 2008 the disclosure of which is incorporated herein by reference in its entirety. This application is related to U.S. application Ser. No. 12 / 426,742, filed Apr. 20, 2009, and published Oct. 22, 2009, as publication no. 2009 / 0263438, the disclosure of which is incorporated herein by reference in its entirety.FIELD OF THE INVENTION [0002]This invention relates to compositions and methods useful for controlling biofilms and microorganisms in plants, particularly vascular plants.BACKGROUND OF THE INVENTION[0003]New approaches are urgently needed to improve agricultural production, given the steadily growing global population that is predicted to reach 6-9 billion persons by mid-century, the continual strain on existing and finite agricultural lands, and the recent diversion of valuable agricultural land from production of crops to production of biomas...

Claims

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Application Information

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IPC IPC(8): A01N43/647A01P21/00A01P1/00A01P3/00A01N59/20A01N63/02A01N63/40
CPCA01N43/647A01N43/653A01N63/00A01N59/20C07D403/06A01N63/40
Inventor MELANDER, CHRISTIANCAVANAGH, JOHNRITCHIE, DAVID F.ROGERS, STEVEN A.HUIGENS, III, ROBERT W.
Owner NORTH CAROLINA STATE UNIV
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