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  • Title: MeWRKY20 and its interacting and activating autophagy-related protein 8 (MeATG8) regulate plant disease resistance in cassava.
    Author: Yan Y, Wang P, He C, Shi H.
    Journal: Biochem Biophys Res Commun; 2017 Dec 09; 494(1-2):20-26. PubMed ID: 29056507.
    Abstract:
    As a highly conserved mechanism, autophagy is responsible for the transport of cytoplasmic constituents in the vacuoles or lysosomes. Moreover, autophagy is essential for plant development and various stress responses. In this study, 34 MeATGs were systematically identified in cassava, and their transcripts were commonly regulated by Xanthomonas axonopodis pv manihotis (Xam). Through transient expression in Nicotiana benthamiana, the subcellular locations of 4 MeATG8s were revealed. Notably, MeWRKY20 was identified as physical interacting protein of MeATG8a/8f/8h and upstream transcriptional activator of MeATG8a. Through virus-induced gene silencing (VIGS) in cassava, we found that MeATG8-silenced and MeWRKY20-silenced plants resulted in disease sensitive, with less callose depositions and lower autophagic activity. This study may facilitate our understanding of the upstream MeWRKY20 and underlying target as well as interacting proteins of MeATG8s in immune response. Taken together, MeWRKY20 and MeATG8a/8f/8h are essential for disease resistance against bacterial blight by forming various transcriptional modules and interacting complex in cassava.
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