Light regulation of jasmonate metabolism and signaling in Arabidopsis

BALLARE, CARLOS L.

Conferencia; VIB Conference Series, University of Ghent -Regulatory Oxylipins ?Light regulation of jasmonate metabolism and signaling in Arabidopsis?; 2019

VIB UGhent

Light regulation of jasmonate metabolism and signaling in ArabidopsisCarlos L. BallaréIFEVA and IIB Consejo Nacional de Investigaciones Científicas y Técnicas ? Universidad de Buenos Aires, Ave. San Martín 4453, C1417DSE, Buenos Aires, Argentina and IIB-INTECH, Consejo Nacional de Investigaciones Científicas y Técnicas?Universidad Nacional de San Martín, B1650HMP Buenos Aires, ArgentinaPlants detect and respond to the proximity of competitors using light signals perceived by photoreceptor proteins. A low ratio of red to far-red radiation (R:FR ratio) is a signal of competition that is sensed by phytochrome B (phyB). Low R:FR ratios increase the synthesis of growth-related hormones, including auxin and gibberellins. phyB is also an important modulator of hormonal pathways that regulate plant immunity against herbivores and pathogens, including the jasmonic-acid (JA) signaling pathway. Low R:FR ratios down-regulate JA-induced responses. This down-regulation is thought to help the plant to optimize its developmental configuration and efficiently redirect resources from defense to rapid growth under conditions of intense competition. In this presentation, I will discuss recent advances in the understanding of the mechanisms that link phyB with JA signaling and metabolism, and explore their functional implications. Unveiling the molecular links between photoreceptors and the regulators of plant immunity is important to understand how plants deal with resource allocation tradeoffs under natural conditions.