Hormone-like peptides and small coding genes in plant stress signaling and development

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Recent works have shed light on the long-distance interorgan signaling by which hormone-like peptides precisely regulate physiological effects in a manner similar to phytohormones. Many such peptides have already been identified in the primary model plant, Arabidopsis thaliana. In addition, Arabidopsis genome reanalysis revealed over 7000 novel candidate small coding genes, some of which are likely to be associated with hormone-like peptides. Hormone-like peptides have also been reported to play critical roles in interorgan communications during morphogenesis and stress responses. In this review, we focus on the functional roles of hormone-like peptides and small coding genes in cell-to-cell and/or long-distance communications during plant stress signaling and development and discuss the evolutionary conservation of these peptides among plants.

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