In our earlier investigation, we had demonstrated that transgenic cotton plants expressing At showed significant tolerance to f. sp. isolate 11 (11) and several other pathogens. The current study was designed to further characterize the nature of the protection provided by expression and its limitations. Green Fluorescent Protein-expressing was generated and used to study the progression of the disease within the plant. The results show that the spread of the pathogen was slower in the At-transformants compared to the wild type plants. Transcript analysis in the seedling root and hypocotyl showed that the transgenic lines are capable of launching a stronger defense response when infected with 11. We further confirmed that At transformants showed greater degree of tolerance to 11. However, little or no protection was observed against a related, but more virulent isolate, 43, and a highly virulent isolate, CA9.
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