Key message MeGAPCs were identified as negative regulators of plant disease resistance, and theinteraction of MeGAPCs and MeATG8s was highlighted in plant defense response. Abstract As an important enzyme of glycolysis metabolic pathway, glyceraldehyde-3-P dehydrogenase (GAPDH) plays important roles in plant development, abiotic stress and immune responses. Cassava (Manihot esculenta) is most important tropical crop and one of the major food crops, however, no information is available about GAPDH gene family in cassava. In this study, 14 MeGAPDHs including 6 cytosol GAPDHs (MeGAPCs) were identified from cassava, and the transcripts of 14 MeGAPDHs in response to Xanthomonas axonopodis pv manihotis (Xam) indicated their possible involvement in immune responses. Further investigation showed that MeGAPCs are negative regulators of disease resistance against Xam. Through transient expression in Nicotiana benthamiana, we found that overexpression of MeGAPCs led to decreased disease resistance against Xam. On the contrary, MeGAPCs-silenced cassava plants through virus-induced gene silencing (VIGS) conferred improved disease resistance. Notably, MeGAPCs physically interacted with autophagy-related protein 8b (MeATG8b) and MeATG8e and inhibited autophagic activity. Moreover, MeATG8b and MeATG8e negatively regulated the activities of NAD- dependent MeGAPDHs, and are involved in MeGAPCs-mediated disease resistance. Taken together, this study highlights the involvement of MeGAPCs in
Plant Molecular Biology – Springer Journals
Published: Apr 20, 2018
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