The Mitochondrial Protein Whirly2 Regulates Seed Germination and Early Stages of Growth in Arabidopsis Thaliana
| Autor: | Golin, Serena |
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| Rok vydání: | 2018 |
| Předmět: |
Settore BIO/04 - Fisiologia Vegetale
food and beverages segnale retrogrado dei mitocondri/mitochondria retrograde signalling piante/plants Arabidopsis thaliana Whirly2 sviluppo e germinazione del seme/seed development and germinazion mitocondri piante/ plant mitochondria nucleoidi/nucleoids BIO/04 Fisiologia vegetale |
| Popis: | Variations in amount and structural integrity of organellar DNA are tightly regulated by nuclear-organelle cross-talk. Whirly proteins are DNA binding proteins that were shown to play a role in organellar DNA maintenance and organization [Marechal et al. 2008; Cappadocia et al 2010]. Arabidopsis thaliana has three Whirly proteins with different subcellular localization: Whirly1 and Whirly3 are targeted to chloroplasts, while Whirly2 is targeted to mitochondria [Krause et al. 2005]. WHIRLY2 gene expression is related to early plant development, being expressed in imbibed seeds, shoot apex and roots of young seedlings. A T-DNA insertional mutant for the WHIRLY2 gene shows an obvious phenotype on seeds, germination and early stages of plant growth. At subcellular level Whirly2 regulates mitochondria morphology, dynamics and functionality of the electron transport chain. Transmitted electron microscopy (TEM) revealed that Whirly2 is a major mitochondrial nucleoids organizer, and it influences both mtDNA and ptDNA copy number. Moreover, our results suggest a coordination of WHIRLY genes that controls expression of target genes of organellar signals upon development and stress conditions. |
| Databáze: | OpenAIRE |
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