Abstract
Abscisic acid (ABA) is a key hormone involved in tuning responses to several abiotic stresses and also has remarkable impacts on plant defense against various pathogens. The roles of ABA in plant defense against bacteria and fungi are multifaceted, inducing or reducing defense responses depending on its time of action. However, ABA induces different resistance mechanisms to viruses regardless of the induction time. Recent studies have linked ABA to the antiviral silencing pathway, which interferes with virus accumulation, and the micro RNA (miRNA) pathway through which ABA affects the maturation and stability of miRNAs. ABA also induces callose deposition at plasmodesmata, a mechanism that limits viral cell-to-cell movement. Bamboo mosaic virus (BaMV) is a member of the potexvirus group and is one of the most studied viruses in terms of the effects of ABA on its accumulation and resistance. In this review, we summarize how ABA interferes with the accumulation and movement of BaMV and other viruses. We also highlight aspects of ABA that may have an effect on other types of resistance and that require further investigation.
Highlights
Antiviral Roles of Abscisic Acid in PlantsEdited by: Ricardo Flores, Instituto de Biología Molecular y Celular de Plantas (CSIC), Spain
Plants adapt to or tolerate stress through production of specific hormones that are produced at very low concentrations
The increased expression of several genes of the AGO, RNA-directed RNA polymerase (RDR), and DCL families in response to abscisic acid (ABA), as well as the observation that several of these genes are important players in the antiviral RNA silencing pathway, strengthens the notion that the antiviral role of ABA is partially achieved through the RNA silencing pathway
Summary
Edited by: Ricardo Flores, Instituto de Biología Molecular y Celular de Plantas (CSIC), Spain. Reviewed by: Tessa Maureen Burch-Smith, University of Tennessee, Knoxville, United States Alberto Carbonell, Instituto de Biología Molecular y Celular de Plantas (CSIC), Spain. The roles of ABA in plant defense against bacteria and fungi are multifaceted, inducing or reducing defense responses depending on its time of action. ABA induces different resistance mechanisms to viruses regardless of the induction time. Bamboo mosaic virus (BaMV) is a member of the potexvirus group and is one of the most studied viruses in terms of the effects of ABA on its accumulation and resistance. We summarize how ABA interferes with the accumulation and movement of BaMV and other viruses. We highlight aspects of ABA that may have an effect on other types of resistance and that require further investigation
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