Morris, Karl, Linkies, Ada, Müller, Kerstin, Oracz, Krystyn, Wang, Xiaofen, Lynn, James R. , Leubner-Metzger, Gerhard and Finch-Savage, William E. (2011) Regulation of seed germination in the close Arabidopsis relative Lepidium sativum : a global tissue-specific transcript analysis. Plant physiology, Vol.155 (No.4). pp. 1851-1870. doi:10.1104/pp.110.169706

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Abstract

The completion of germination in Lepidium sativum and other endospermic seeds (e.g. Arabidopsis [Arabidopsis thaliana]) is regulated by two opposing forces, the growth potential of the radicle (RAD) and the resistance to this growth from the micropylar endosperm cap (CAP) surrounding it. We show by puncture force measurement that the CAP progressively weakens during germination, and we have conducted a time-course transcript analysis of RAD and CAP tissues throughout this process. We have also used specific inhibitors to investigate the importance of transcription, translation, and posttranslation levels of regulation of endosperm weakening in isolated CAPs. Although the impact of inhibiting translation is greater, both transcription and translation are required for the completion of endosperm weakening in the whole seed population. The majority of genes expressed during this process occur in both tissues, but where they are uniquely expressed, or significantly differentially expressed between tissues, this relates to the functions of the RAD as growing tissue and the CAP as a regulator of germination through weakening. More detailed analysis showed that putative orthologs of cell wall-remodeling genes are expressed in a complex manner during CAP weakening, suggesting distinct roles in the RAD and CAP. Expression patterns are also consistent with the CAP being a receptor for environmental signals influencing germination. Inhibitors of the aspartic, serine, and cysteine proteases reduced the number of isolated CAPs in which weakening developed, and inhibition of the 26S proteasome resulted in its complete cessation. This indicates that targeted protein degradation is a major control point for endosperm weakening.

Item Type:	Journal Article
Subjects:	Q Science > QK Botany
Divisions:	Faculty of Science > Life Sciences (2010- )
Library of Congress Subject Headings (LCSH):	Germination, Lepidium -- Genetics, Endosperm
Journal or Publication Title:	Plant physiology
Publisher:	American Society of Plant Biologists
ISSN:	1532-2548
Official Date:	April 2011
Dates:	Date Event April 2011 Published
Volume:	Vol.155
Number:	No.4
Page Range:	pp. 1851-1870
DOI:	10.1104/pp.110.169706
Status:	Peer Reviewed
Access rights to Published version:	Open Access
Funder:	Biotechnology and Biological Sciences Research Council (Great Britain) (BBSRC), Deutsche Forschungsgemeinschaft (DFG), Deutscher Akademischer Austauschdienst (DAAD), Wissenschaftliche Gesellschaft in Freiburg i.B., Natural Science Foundation of Guangdong Province (NSFGP), Alexander von Humboldt-Stiftung (AvHS)
Grant number:	BB/E006418/1 (BBSRC), LE720/6 (DFG), D/0628197 (DAAD), 07006658 (NSFGP), MU3114/ 1–1 (DFG)

Data sourced from Thomson Reuters' Web of Knowledge

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