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Summary  Cassava bacterial blight (CBB) caused by  Xanthomonas axonopodis  pv.  manihotis  ( Xam ) seriously affects cassava yield. Nitrate reductase (NR) plays an important role in plant nitrogen metabolism in plants. However, the  in vivo  role of NR and the corresponding signalling pathway remain unclear in cassava. In this study, we isolated  MeNR1/2  and revealed their novel upstream transcription factor MeRAV5. We also identified MeCatalase1 (MeCAT1) as the interacting protein of MeRAV5. In addition, we investigated the role of MeCatalase1 and MeRAV5‐ MeNR1/2  module in cassava defence response.  MeNRs  positively regulates cassava disease resistance against CBB through modulation of nitric oxide (NO) and extensive transcriptional reprogramming especially in mitogen‐activated protein kinase (MAPK) signalling. Notably, MeRAV5 positively regulates cassava disease resistance through the coordination of NO and hydrogen peroxide (H 2 O 2 ) level. On the one hand, MeRAV5 directly activates the transcripts of  MeNRs  and NO level by binding to CAACA motif in the promoters of  MeNRs . On the other hand, MeRAV5 interacts with MeCAT1 to inhibit its activity, so as to negatively regulate endogenous H 2 O 2  level. This study highlights the precise coordination of NR activity and CAT activity by MeRAV5 through directly activating  MeNRs  and interacting with MeCAT1 in plant immunity.

The dual interplay of RAV5 in activating nitrate reductases and repressing catalase activity to improve disease resistance in cassava