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United States Department of Agriculture

Agricultural Research Service

Research Project: DEVELOP SYSTEM OF DEFENSE AGAINST XANTHOMONAS CITRI (XCC) USING SANITATION, ANTIMICROBIAL COMPOUNDS AND ASSESSING LESIONS FOR VIRULENCE

Location: Citrus and Other Subtropical Products Research

Project Number: 6618-41430-005-03
Project Type: Nonfunded Cooperative Agreement

Start Date: Jan 01, 2009
End Date: Dec 31, 2013

Objective:
Develop a fruit treatment method to help lift the quarantine that prohibits the shipment of citrus fruit from Florida to many areas, which is devastating the citrus industry. Our work is directed towards developing a system of sanitizers and antimicrobials applied on the packingline which would insure that there were no living Xanthomonas citri subsp. citri (Xcc) cells in fruit leaving the packinghouses. Also we will be looking at the various lesion types to help explain the lack of infection from old lesions and virulence of many leaf lesions.

Approach:
Initially we will be screening experimental compounds in the laboratory by in vitro testing with petri- dishes and pathogens of citrus to see if there is an indication of success with these compounds. This would involve using protocols already in place in addition to utilizing new methods for testing. Concurrently we will be testing packingline protocols already in place to see how much, if any, antimicrobial capabilities are already on the line. The compounds that are active against Xanthomonas citri subsp. citri (Xcc) will be tested on a pilot packingline at the Winter Haven facility. If these compounds are successful on this line, the protocol will be scaled up for trial in a commercial packinghouse. In the field we will be collecting fruit, twig and leaf lesions for the infection study. The lesions will be tested for biofilm development using fluorescent microscopy and changes in the microbial communities in the lesions will be evaluated by various isolation techniques and organisms identified by molecular protocols.

Last Modified: 7/11/2014
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