What crops are affected by Pseudomonas syringae pv. Maculicola?
Pseudomonas syringae pv. maculicola (PSM) causes bacterial leaf spot in cauliflower, broccoli, brussels sprouts and other brassicas. GSLs interactions trigger plant immune response against PSM. Brader showed that Arabidopsis, which expresses the sorghum gene CYP79A1, endogenous CYP79A2 gene or benzyl GSL respectively, showed increased resistance towards PSM. Using a series of physiological and genetic tools, Groen showed that PSM enhances the feeding of infected plant parts by the herbivore, Scaptomyza flava partly by suppressing anti-herbivore defense mechanisms triggered by ROS burst.
Stahl showed that indol-3-ylmethylamine (I3A) was one of the three major accumulating compounds and is also produced via IGSL breakdown by pathways dependent and independent of the myrosinase PEN2. Their report also show that salicylic acid defense hormone produce I3A at the expense of its precursor indol-3-ylmethylglucosinolate (I3M), and the SAR regulator pipecolic acid primes plants for enhanced PSM-induced activation of distinct branches of indolic metabolism. The report of Jiang suggests the biosynthesis of GSL from tryptophan and Aliphatic GSL biosynthesis side chain may be triggered following PSM infection. More so, differential co-expression is a common phenomenon during plant. These findings put together suggest the existence of an effective pathway by which GSLs and their metabolites may be manipulated for formidable defense response to bacterial pathogens such as PSM.