The role of chloroplastic NAD(P)H dehydrogenase in photoprotection.
After a brief exposure to supra-saturating light, leaves of a tobacco transformant, in which chloroplastic NAD(P)H dehydrogenase (NDH) was defective, showed more severe photoinhibition than the wild-type, when judged by the parameter of chlorophyll fluorescence Fv/Fm. Repeated application of supra-saturating light eventually resulted in chlorosis in the NDH-defective mutant, while the wild-type sustained less photodamage and was able to recover from it. The mechanism of the phenomena is discussed with respect to the potential role of NDH in photosynthesis.
Endo
T
T
Division of Integrated Life Sciences, Graduate School of Biostudies, Kyoto University, Japan. tuendo@kais.kyoto-u.ac.jp
Shikanai
T
T
Takabayashi
A
A
Asada
K
K
Sato
F
F
D002736:Chloroplasts / Q000201:enzymology*; D005287:Ferredoxin-NADP Reductase / Q000378:metabolism; D008027:Light / Q000009:adverse effects*; D045342:Light-Harvesting Protein Complexes; D016254:Mutagenesis, Insertional; D009252:NADPH Dehydrogenase / Q000502:physiology*; D010084:Oxidation-Reduction; D010788:Photosynthesis / Q000502:physiology; D045322:Photosynthetic Reaction Center Complex Proteins / Q000378:metabolism; D010940:Plant Proteins / Q000502:physiology; D010947:Plants, Toxic; D013997:Time Factors; D014026:Nicotiana / Q000201:enzymology / Q000528:radiation effects; D014170:Transformation, Genetic
D045342:Light-Harvesting Protein Complexes; D045322:Photosynthetic Reaction Center Complex Proteins; D010940:Plant Proteins; D005287:Ferredoxin-NADP Reductase; D009252:NADPH Dehydrogenase