Retrograde signals from mitochondria reprogramme skoto-morphogenesis in Arabidopsis thaliana via alternative oxidase 1a.

ABSTRACT: The early steps in germination and development of angiosperm seedlings often occur in the dark, inducing a special developmental programme called skoto-morphogenesis. Under these conditions photosynthesis cannot work and all energetic requirements must be fulfilled by mitochondrial metabolization of storage energies. Here, we report the physiological impact of mitochondrial dysfunctions on the skoto-morphogenic programme by using the Arabidopsis rpoTmp mutant. This mutant is defective in the T7-phage-type organellar RNA polymerase shared by plastids and mitochondria. Lack of this enzyme causes a mitochondrial dysfunction resulting in a strongly reduced mitochondrial respiratory chain and a compensatory upregulation of the alternative-oxidase (AOX)-dependent respiration. Surprisingly

SUBMITTER: Merendino L 

PROVIDER: S-EPMC7209964 | biostudies-literature | 2020 Jun

REPOSITORIES: biostudies-literature