The fungal UmSrt1 and maize ZmSUT1 sucrose transporters battle for plant sugar resources
作者： Anke Wittek , Ingo Dreyer , Khaled A.S. Al-Rasheid , Norbert Sauer , Rainer Hedrich
DOI: 10.1111/JIPB.12535
关键词:
摘要: The biotrophic fungus Ustilago maydis causes corn smut disease, inducing tumor formation in its host Zea mays. Upon infection, the fungal hyphae invaginate plasma membrane of infected maize cells, establishing an interface where pathogen and are separated only by their membranes. At this sucrose transporters, UmSrt1 ZmSUT1, compete for extracellular smut/maize pathosystem. Here we biophysically characterized ZmSUT1 Xenopus oocytes with respect to voltage-, pH- substrate-dependence determined affinities toward protons sucrose. In contrast has a high affinity is relatively voltage-independent. Using these quantitative parameters, developed mathematical model simulate competition at contact zone between plant. This approach revealed that exploits apoplastic resource, which forces plant transporter into export mode providing sugar from phloem. Importantly, concentration phloem appeared disadvantageous preventing recovery space fungus/plant interface.
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