During Arabidopsis embryogenesis, cell-cell signaling plays an essential role in establishing an organized body plan centered around two major axes of development: apical-basal and radial. Two topics of great interest are how the layered structure is initiated and maintained during and after embryogenesis and how communication between layers is achieved to allow for coordinated development. Recent research involving Receptor-Like Kinases (RLKs) in plants suggests that their roles in integrating various signals are important in many aspects of development, including embryonic and post-embryonic patterning. The research presented here describes the roles of two pairs of RLKs with independent roles in two different signaling environments. The first RLK pair, GSO1 and GSO2, function in root development at the transition to photoautotrophic nutrition to integrate sugar signals and regulate root growth. GSO1 and GSO2 regulate root epidermal cell identity by controlling the pattern of cell division of stem cells. The second pair of RLKs, RPK1 and TOAD2, function to control root development by regulation of meristem proliferation and a coordinated response to signaling molecules of the CLE family. The response of wild-type roots to treatment with CLE peptides (A-type) is meristem growth arrest, resulting in short roots. toad2 mutants are insensitive to the effect of CLE peptides in reducing meristem size and TOAD2 also regulates RPK1 upon CLE stimulation. Although responding to different signals, the two pairs of RLK share a common output of regulating cell proliferation in and around the root meristem, especially in the epidermis of the root.
| Identifer | oai:union.ndltd.org:arizona.edu/oai:arizona.openrepository.com:10150/312738 |
| Date | January 2013 |
| Creators | Racolta, Adriana |
| Contributors | Tax, Frans E., Fares, Hanna, Schumaker, Karen, Zarnescu, Daniela |
| Publisher | The University of Arizona. |
| Source Sets | University of Arizona |
| Language | en_US |
| Detected Language | English |
| Type | text, Electronic Dissertation |
| Rights | Copyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author. |
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