74.シロイヌナズナにおける植物ホルモンバランスと植物ホルモン応答性遺伝子発現の関係(口頭発表)

概要

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Plants are exposed to various stresses, such as pathogen attacks and environmental stress. Plants have evolved a unique hormonally regulated self-protection system to defend themselves from various stresses. In plants, salicylic acid (SA), jasmonic acid (JA) and abscisic acid (ABA) play important roles in adaptation to biotic and abiotic stresses. In addition, recent studies have shown that each plant hormone is mutually antagonistic interactions in complex networks of various signaling pathways. For instance, treatment with ABA suppresses the induction of systemic acquired resistance (SAR) by inhibiting the pathway both upstream and downstream of SA signaling. Conversely, the activation of SAR suppresses the expression of ABA biosynthesis-related and ABA-responsive genes. These results show that antagonistic crosstalk occurs at multiple steps between the SA-mediated signaling of SAR induction and the ABA-mediated signaling of environmental stress responses. Here, we will discuss the complex plant hormone-networks by analyzing expression of plant hormone related-genes in SA-, JA- and/or ABA-treated leaf tissues of A. thaliana.
2010-10-01