Team:Colombia/Project/Basics

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The Basics

Our objective is to generate a genetically-modified bacteria "detect and alert" system, particularly as a defense aid for coffee plantations against fungi. Bacteria are built such that they can detect chitin, an organic compound found in fungal cell walls, amplify this initial signal, and finally alert the plant by stimulating an early hypersensitive response against infection. We have also included a way for the bacteria to control their own population density. Using the bacteria Escherichia coli DH5α, the system will use two differently-modified plasmids to insert into one bacterium. The first one will detect the presence of chitin and weigh such input for intensity and duration. If significant, it will also produce a signal molecule to engage the response of the second palsmid. Upon exposure to enough concentration of the molecule, the second plasmid will produce a systemic acquired response triggering hormone (salicylic acid) to activate the plant defenses, both attacking the fungi as well as controlling the bacterial population growth. We strongly believe this biocontrol method may prove to become a powerful tool for farmers and crop workers everywhere. In addition, our constructed "detect and alert" biobricks could be useful to plentiful synthetic biology experiments and future iGEM teams.