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?1d). The differences in qP between http://www.selleckchem.com/products/pd-0332991-palbociclib-isethionate.html the wild type and aox1a were statistically significant at light intensities of 110, 200 and 450??mol photons m?2?s?1 (P? http://www.selleckchem.com/products/Trichostatin-A.html (Fig.?1b�Cg). To further address the relationship between AOX and CET-PSI, we attempted to analyse the effects of the AOX deficiency on photosynthesis in the pgr5 mutant, which has a defect in the main route of CET-PSI (Munekage et?al. 2002). For this purpose, an aox1a pgr5 double mutant was generated by crossing each single mutant http://www.selleck.cn/products/ve-822.html and screening the resulting F2 generation for homozygous double mutant (Fig.?2a). Immunoblotting analysis showed that the accumulation of AOX and PGR5 proteins was impaired in the corresponding mutants (Fig.?2b). The amount of other examined chloroplastic and mitochondrial proteins was not affected. When grown under LL conditions, aox1a pgr5 exhibited a nearly indistinguishable visible phenotype from the wild type (Col-gl1) and pgr5 single mutant (Fig.?2c). Figure?2d�Ck shows the photosynthetic characteristics in the wild type, pgr5 and aox1a pgr5. As already demonstrated (e.g. Munekage et?al. 2002; Okegawa, Kobayashi & Shikanai 2010), pgr5 showed a lowered ��PSII (Fig.?2d), an impaired NPQ induction (Fig.?2e) and a lowered qP (Fig.?2f) at high irradiance. A drastically lowered ��PSI (Fig.?2g) and an over-reduction of P700 (Fig.?2h) were also observed in pgr5. As expected, the CET-PSI activity, represented by ��PSI/��PSII, was strongly suppressed in pgr5 (Fig.?2i). It should be mentioned that the role of PGR5 in CET-PSI remains to be fully determined (Nandha et?al. 2007; Shikanai 2007; DalCorso et?al. 2008).