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Articles by Tom Isakeit in JoVE
JoVE Immunology and Infection
Kwantificering van schimmelkolonisatie, Sporogenesis, en de productie van mycotoxinen Met behulp van Kernel Bioassays
Plant Pathology and Microbiology, Texas A&M University
De verwoesting van de graangewassen door zaad-infecterende schimmels heeft ertoe geleid dat tal van onderzoeksinspanningen om beter te begrijpen plant-pathogeen interacties. Om zaad-schimmel interacties in een laboratorium te bestuderen, ontwikkelden we een robuuste methode voor de kwantificering van de schimmel reproductie, biomassa en verontreiniging met mycotoxinen met behulp van kernel bioassays.
Other articles by Tom Isakeit on PubMed
Inactivation of the Lipoxygenase ZmLOX3 Increases Susceptibility of Maize to Aspergillus Spp
Plant and fungal lipoxygenases (LOX) catalyze the oxidation of polyunsaturated fatty acids, creating fatty-acid hydroperoxides (oxylipins). Fungal oxylipins are required for normal fungal development and secondary metabolism, and plant host-derived oxylipins interfere with these processes in fungi, presumably by signal mimicry. The maize LOX gene ZmLOX3 has been implicated previously in seed-Aspergillus interactions, so we tested the interactions of a mutant maize line (lox3-4, in which ZmLOX3 is disrupted) with the mycotoxigenic seed-infecting fungi Aspergillus flavus and Aspergillus nidulans. The lox3-4 mutant was more susceptible than wild-type maize to both Aspergillus species. All strains of A. flavus and A. nidulans produced more conidia and aflatoxin (or the precursor sterigmatocystin) on lox3-4 kernels than on wild-type kernels, in vitro and under field conditions. Although oxylipins did not differ detectably between A. flavus-infected kernels of the lox3-4 and wild-type (WT) maize, oxylipin precursors (free fatty acids) and a downstream metabolite (jasmonic acid) accumulated to greater levels in lox3-4 than in WT kernels. The increased resistance of the lox3-4 mutant to other fungal pathogens (Fusarium, Colletotrichum, Cochliobolus, and Exserohilum spp.) is in sharp contrast to results described herein for Aspergillus spp., suggesting that outcomes of LOX-governed host-pathogen interactions are pathogen-specific.
