Expression in Affects the State of Chloroplast Photoprotective Systems under Moderately High Light Conditions.

Alternative oxidase (AOX) in the mitochondrial electron transport chain is considered important for sustaining photosynthesis under high light conditions. Here, we examined the effects of the AOX pathway on the state of chloroplast photoprotective systems. plants (4 weeks old), comprising three genotypes (wild type [WT], overexpressing [XX-2] and antisense [AS-12] lines for ), were exposed to moderately high light conditions (MHL, 400 μmol m s) in a short-term experiment (8 h).

Responses of genes of DNA repair, alternative oxidase, and pro-/antioxidant state in with altered expression of to gamma irradiation.

Purpose: High doses of gamma (γ) irradiation cause oxidative stress and DNA damage. Alternative oxidase (AOX) catalyzes the energy-dissipating cyanide-resistant alternative pathway in plant mitochondria and is an important part of the cellular defense network under stress conditions. In this study, plants with an altered expression of the gene were exposed by high dose-rate ionizing radiation to assess the expression of genes of DNA repair and pro-/antioxidant states to elucidate the functional significance of AOX in plant stress response.

The gene expression profiles of mitochondrial respiratory components in Arabidopsis plants with differing amounts of under high intensity light.

We compared the expression of mitochondrial alternative oxidase (AOX) and other non-phosphorylating respiratory components (NPhPs) in wild type and transgenic following short-term transfer of plants to higher irradiance conditions to gain more insight into the mechanisms of AOX functioning under light. The overexpressing line (XX-2) showed the highest amount of transcripts and AOX1A synthesis during the entire experiment, and many NPhPs genes were down-regulated after 6-8 h under the higher light conditions. Antisense AS-12 plants displayed a compensatory effect, typically after 8 h of exposure to higher irradiance, by up-regulating their expression of the majority of genes encoding AOX and other respiratory components.

Altered levels of AOX1a expression result in changes in metabolic pathways in Arabidopsis thaliana plants acclimated to low dose rates of ultraviolet B radiation.

UV-B is a damaging component of solar radiation that inevitably reaches the Earth's surface. Plants have developed response mechanisms to adapt to UVB exposure. The alternative oxidase (AOX) catalyzes the ATP-uncoupling cyanide-resistant alternative pathway (AP) in plant mitochondria and is thought to be an important part of the cellular defense network under stress conditions.

Expression profiles of genes for mitochondrial respiratory energy-dissipating systems and antioxidant enzymes in wheat leaves during de-etiolation.

Mitochondrial respiratory components participate in the maintenance of chloroplast functional activity. This study investigates the effects 48h de-etiolation of spring wheat seedlings (Triticum aestivum L., var.

Light regulation of mitochondrial alternative oxidase pathway during greening of etiolated wheat seedlings.

This study deals with effects of de-etiolation (48h) of spring wheat (Triticum aestivum L., var. Irgina) seedlings on differential expression of AOX1 genes, levels of AOX protein and the alternative respiratory pathway (AP) capacity.