Assay of photoinhibition and heat inhibition of photosystem II in higher plants.
When thylakoids of higher plant chloroplasts are exposed to excessive light or moderate heat stress, photosystem II reaction center-binding protein D1 is damaged. The photodamage of the D1 protein is caused by reactive oxygen species, mostly singlet oxygen, and also by endogenous cationic radicals generated by the photochemical reactions of photosystem II. Moreover, it was shown recently that the damage to the D1 protein by moderate heat stress is due to reactive oxygen species produced by lipid peroxidation near photosystem II. To maintain photosystem II activity, the oxidatively damaged D1 protein must be replaced by a newly synthesized copy, and thus degradation and removal of the photo- or heat-damaged D1 protein are essential for maintaining the viability of photosystem II. In this chapter, we describe the methods for assaying photoinhibition and heat inhibition of photosystem II in higher plant materials.
Nijo
Nobuyoshi
N
Graduate School of Natural Science and Technology, Okayama University, Okayama, Japan.
Lundin
Björn
B
Yoshioka
Miho
M
Morita
Noriko
N
Yamamoto
Yasusi
Y
D015153:Blotting, Western; D004591:Electrophoresis, Polyacrylamide Gel; D057075:Enzyme Assays; D018525:Germination; D006358:Hot Temperature; D008027:Light; D010084:Oxidation-Reduction; D010446:Peptide Fragments / Q000378:metabolism; D010447:Peptide Hydrolases / Q000378:metabolism; D045332:Photosystem II Protein Complex / Q000037:antagonists & inhibitors* / Q000302:isolation & purification / Q000378:metabolism; D059828:Plant Cells; D063245:Plant Development; D018515:Plant Leaves / Q000201:enzymology / Q000254:growth & development / Q000528:radiation effects; D010944:Plants / Q000201:enzymology* / Q000528:radiation effects*; D036226:Seedlings / Q000201:enzymology / Q000254:growth & development / Q000528:radiation effects; D020524:Thylakoids / Q000201:enzymology
D010446:Peptide Fragments; D045332:Photosystem II Protein Complex; D010447:Peptide Hydrolases