NDLI: The plastid outer envelope protein OEP16 affects metabolic fluxes during ABA-controlled seed development and germination

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The plastid outer envelope protein OEP16 affects metabolic fluxes during ABA-controlled seed development and germination

Content Provider	PubMed Central
Author	Pudelski, Birgit Schock, Annette Hoth, Stefan Radchuk, Ruslana Weber, Hans Hofmann, Jörg Sonnewald, Uwe Soll, Jürgen Philippar, Katrin
Copyright Year	2012
Abstract	Previously, the OEP16.1 channel pore in the outer envelope membrane of mature pea (Pisum sativum) chloroplasts in vitro has been characterized to be selective for amino acids. Isolation of OEP16.2, a second OEP16 isoform from pea, in the current study allowed membrane localization and gene expression of OEP16 to be followed throughout seed development and germination of Arabidopsis thaliana and P. sativum. Thereby it can be shown on the transcript and protein level that the isoforms OEP16.1 and OEP16.2 in both plant species are alternating: whereas OEP16.1 is prominent in early embryo development and first leaves of the growing plantlet, OEP16.2 dominates in late seed development stages, which are associated with dormancy and desiccation, as well as early germination events. Further, OEP16.2 expression in seeds is under control of the phytohormone abscisic acid (ABA), leading to an ABA-hypersensitive phenotype of germinating oep16 knockout mutants. In consequence, the loss of OEP16 causes metabolic imbalance, in particular that of amino acids during seed development and early germination. It is thus concluded that in vivo OEP16 most probably functions in shuttling amino acids across the outer envelope of seed plastids.
Related Links	http://dx.doi.org/10.1093/jxb/err375
Starting Page	1919
File Format	PDF
ISSN	14602431
e-ISSN	14602431
Journal	Journal of Experimental Botany
Issue Number	5
Volume Number	63
Language	English
Publisher	Oxford University Press
Publisher Date	2012-03-01
Access Restriction	Open
Rights Holder	Oxford University Press
Subject Keyword	Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Physiology Plant Science

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