Protein Variants | Comment | Organism |
---|---|---|
additional information | generation of the rice mutant defective in the OsCRR6 gene by the Tos17 retrotransposon insertion | Oryza sativa Japonica Group |
Localization | Comment | Organism | GeneOntology No. | Textmining |
---|---|---|---|---|
chloroplast | - |
Oryza sativa Japonica Group | 9507 | - |
thylakoid membrane | - |
Oryza sativa Japonica Group | 42651 | - |
Organism | UniProt | Comment | Textmining |
---|---|---|---|
Oryza sativa Japonica Group | - |
cv. Hitomebore | - |
Synonyms | Comment | Organism |
---|---|---|
OsCRR6 | - |
Oryza sativa Japonica Group |
PS I | - |
Oryza sativa Japonica Group |
General Information | Comment | Organism |
---|---|---|
malfunction | impairment of NDH-dependent cyclic electron flow in rice specifically causes a reduction in the electron transport rate through PS I (ETR I) at low light intensity with a concomitant reduction in CO2 assimilation rate, plant biomass and importantly, grain production, while there is no effect on PS II function at low or high light intensity. Oryza sativa crr6 mutant does not accumulate the NDH complex, CRR6 is specifically required for the assembly of NdhI in subcomplex A of chloroplast NDH, knockout of the crr6 gene in rice also leads to the lack of intact chloroplast NDH, no formation of a NDH-PS I supercomplex in the Crr6 mutant. Phenotype overview | Oryza sativa Japonica Group |
physiological function | while linear electron transport generates both ATP and NADPH, cyclic electron transport around photosystem I (PS I) is exclusively involved in ATP synthesis without the accumulation of NADPH. The role of cyclic electron transport around PS I is proposed to be essential for balancing the ATP/NADPH production ratio and/or for protecting both photosystems from the damage via stromal overreduction. Two pathways of PS I cyclic electron transport have been proposed: the main pathway depends on PGR5 (proton gradient regulation 5) and PGRL1 (PGR5-like photosynthetic phenotype) proteins, whereas the minor pathway is mediated by a chloroplast NADH dehydrogenase-like (NDH) complex. The chloroplast NDH-dependent PS I cyclic electron transport plays a role in alleviation of oxidative damage in strong light. Significant physiological function for the chloroplast NDH at low light intensities commonly experienced during the reproductive and ripening stages of rice cultivation that have adverse effects crop yield. Regulation of photosynthetic electron transport in the thylakoid membrane of chloroplasts is fundamental for the maximum photosynthetic yield and plant growth. Formation of a NDH-PS I supercomplex | Oryza sativa Japonica Group |