Chen, Junyi and Lausser, Andreas and Dresselhaus, Thomas (2014) Hormonal responses during early embryogenesis in maize. BIOCHEMICAL SOCIETY TRANSACTIONS, 42. pp. 325-331. ISSN 0300-5127, 1470-8752
Full text not available from this repository. (Request a copy)Abstract
Plant hormones have been shown to regulate key processes during embryogenesis in the model plant Arabidopsis thaliana, but the mechanisms that determine the peculiar embryo pattern formation of monocots are largely unknown. Using the auxin and cytokinin response markers DRS and TCSv2 (two-component system, cytokinin-responsive promoter version #2), as well as the auxin efflux carrier protein PIN1a (PINFORMED1a), we have studied the hormonal response during early embryogenesis (zygote towards transition stage) in the model and crop plant maize. Compared with the hormonal response in Arabidopsis, we found that detectable hormone activities inside the developing maize embryo appeared much later. Our observations indicate further an important role of auxin, PIN1a and cytokinin in endosperm formation shortly after fertilization. Apparent auxin signals within adaxial endosperm cells and cytokinin responses in the basal endosperm transfer layer as well as chalazal endosperm are characteristic for early seed development in maize. Moreover, auxin signalling in endosperm cells is likely to be involved in exogenous embryo patterning as auxin responses in the endosperm located around the embryo proper correlate with adaxial embryo differentiation and outgrowth. Overall, the comparison between Arobidopsis and maize hormone response and flux suggests intriguing mechanisms in monocots that are used to direct their embryo patterning, which is significantly different from that of eudicots.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | DEPENDENT AUXIN GRADIENTS; REPRODUCTIVE DEVELOPMENT; ENDOSPERM DEVELOPMENT; ARABIDOPSIS; CYTOKININ; TRANSPORT; ENCODES; GROWTH; ORGANOGENESIS; INFLORESCENCE; auxin; cytokinin; DR5; embryo patterning; endosperm development; PINFORMED1 (PIN1); two-component system (ICS); Zea mays |
| Subjects: | 500 Science > 580 Botanical sciences |
| Divisions: | Biology, Preclinical Medicine > Institut für Pflanzenwissenschaften > Lehrstuhl für Zellbiologie und Pflanzenphysiologie |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 15 Nov 2019 10:15 |
| Last Modified: | 15 Nov 2019 10:15 |
| URI: | https://pred.uni-regensburg.de/id/eprint/10398 |
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