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

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.

journal_name

J Exp Bot

journal_title

Journal of experimental botany

authors

Pudelski B,Schock A,Hoth S,Radchuk R,Weber H,Hofmann J,Sonnewald U,Soll J,Philippar K

doi

10.1093/jxb/err375

subject

Has Abstract

pub_date

2012-03-01 00:00:00

pages

1919-36

issue

5

eissn

0022-0957

issn

1460-2431

pii

err375

journal_volume

63

pub_type

杂志文章

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