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Ultraweak photoemission from dark‐adapted leaves and isolated chloroplasts
Author(s) -
Hideg Èva,
Kobayashi Masaki,
Inaba Humio
Publication year - 1990
Publication title -
febs letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.593
H-Index - 257
eISSN - 1873-3468
pISSN - 0014-5793
DOI - 10.1016/0014-5793(90)81454-v
Subject(s) - chloroplast , chemistry , chlorophyll , photochemistry , darkness , arrhenius equation , biophysics , analytical chemistry (journal) , botany , biology , activation energy , biochemistry , chromatography , organic chemistry , gene
Dark‐adapted isolated spinach chloroplasts and leaves, unlike sub‐chloroplast fractions, are capable of emitting ultraweak light spontaneously (50–125 counts per cm 2 ). The emission of leaves is due to two processes with activation energies of 97 and 25 kJ/mol while in isolated chloroplasts, it is the result of a single process (98 kJ/mol), as indicated by the Arrhenius plots of the intensity. Emission spectra demonstrate that the terminal step of these reactions is the excitation of chlorophyll in both samples. We suggest that the additional component in the ultraweak light emission of leaves may be related to mitochondria