Before gene expression: early events in plant-insect interaction.
Successful defense depends on the ability of the plant to recognize an attacking 'enemy' as early as possible. Early defense responses require enemy-initiated signaling cascades. Their activation ensures an induced response that is quantitative, timely and coordinated with other activities of the host cells. Damage-induced ion imbalances and modulations of channel activities are the first events occurring in the plasma membrane and result in rapid perturbations of the plasma membrane potential (V(m)) involving variations of cytosolic Ca(2+) concentrations. Interacting downstream networks of kinases and phytohormones mediate the signal and result in concerted gene activation. Here we review and discuss early events occurring before herbivore attack-related gene expression that are responsible for cascades of events and signal transductions, eventually leading to indirect and direct plant responses.
Maffei
Massimo E
ME
Department of Plant Biology and Centre of Excellence CEBIOVEM, University of Turin, Turin, Italy. massimo.maffei@unito.it
Mithöfer
Axel
A
Boland
Wilhelm
W
D000818:Animals; D017753:Ecosystem; D018506:Gene Expression Regulation, Plant; D007313:Insecta / Q000378:metabolism*; D010937:Plant Growth Regulators / Q000378:metabolism; D018521:Plant Physiological Phenomena; D010940:Plant Proteins / Q000378:metabolism; D010944:Plants / Q000235:genetics*; D017382:Reactive Oxygen Species / Q000378:metabolism; D015533:Transcriptional Activation
D010937:Plant Growth Regulators; D010940:Plant Proteins; D017382:Reactive Oxygen Species