DOI: 10.1101/470401Nov 14, 2018Paper

A novel model plant to study the light control of seed germination

BioRxiv : the Preprint Server for Biology
Zsuzsanna MéraiOrtrun Mittelsten Scheid

Abstract

Timing of seed germination is crucial for seed plants and coordinated by internal and external cues, reflecting adaptations to different habitats. Physiological and molecular studies with lettuce and Arabidopsis thaliana have documented a strict requirement for light to initiate germination and identified many receptors, signalling cascades, and hormonal control elements. In contrast, seed germination of several other plants is inhibited by light, but the molecular basis of this converse response is unknown. We describe Aethionema arabicum (Brassicaceae) as a suitable model plant to investigate the mechanism of germination inhibition by light, as it comprises accessions with natural variation between light-sensitive and light-neutral responses. Inhibition is independent of light wavelength and increases with light intensity and duration. Gibberellins and abscisic acid are involved in the control of germination as in Arabidopsis, but transcriptome comparisons of light- and dark-exposed Aethionema arabicum seeds revealed that expression of genes for key regulators upon light exposure undergo converse changes, resulting in antipodal hormone regulation. This illustrates that similar modular components of a pathway in light-inhibite...Continue Reading

Related Concepts

Abscisic Acid
Genes
Gibberellins
Hormones
Arabidopsis thaliana <plant>
Germination
Lettuce
Adaptation
Brassicaceae
Receptor

Related Feeds

BioRxiv & MedRxiv Preprints

BioRxiv and MedRxiv are the preprint servers for biology and health sciences respectively, operated by Cold Spring Harbor Laboratory. Here are the latest preprint articles (which are not peer-reviewed) from BioRxiv and MedRxiv.

Related Papers

Current Opinion in Plant Biology
Maarten KoornneefHenk W M Hilhorst
Essays in Biochemistry
Sonia Gazzarrini, Allen Yi-Lun Tsai
Proceedings of the National Academy of Sciences of the United States of America
George C K ChiangKathleen Donohue
© 2021 Meta ULC. All rights reserved