抄録
The chloroplast NAD(P)H dehydrogenase (NDH) complex functions in PSI cyclic electron transport and chlororespiration. The electron donor binding module is still unclear. An Arabidopsis crr6 mutant was isolated based on the chlorophyll fluorescence. Photosynthetic electron transport and protein blot analyses indicate that the specific defect of the NDH complex in the mutant due to the mutation of CRR6. However, CRR6 protein was stable in other crr mutants. Inconsistently with our previous report, western blot analyses showed that the CRR6 dominantly localized in the stroma fraction and trace amount of it associate with thylakoid membrane. This result suggests that CRR6 transiently interacts with NDH complex, possibly as a subunit of electron donor binding module present in the stroma.
