Premium
Photophosphorylation and Ultrastructural Development in Pinus nigra Chloroplasts, Grown under Different Spectral Composition of Light
Author(s) -
TYSZKIEWICZ E.,
NICOLIČ D.,
POPOVIČ R.,
SARIČ M.
Publication year - 1979
Publication title -
physiologia plantarum
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.351
H-Index - 146
eISSN - 1399-3054
pISSN - 0031-9317
DOI - 10.1111/j.1399-3054.1979.tb02628.x
Subject(s) - photophosphorylation , chloroplast , photosystem ii , photosystem i , cytochrome b6f complex , biology , botany , chlorophyll , photosynthesis , biophysics , biochemistry , gene
Developed pine seedlings synthesize chlorophyll in darkness. Their photosystem II reducing capacity is very low. The development of chloroplast structure and of photophosphorylation ability has been studied in plastids isolated from Pinus nigra (var. austriaca ) developed for 14 days under different spectral compositions of light as compared with chloroplasts isolated from seedlings grown under white light or in darkness. Chloroplast structure was studied by electron microscopy. Cyclic and non‐cyclic photophosphorylation were studied under white light. The spectral bands which are efficient for the development of granal structures are different from those needed to make photosystem II functional: red light makes photosystem II functional but does not permit the formation of granal structure, and under yellow light the granal structure develops but photosystem II is not fully functional. Orange light alone fulfils both these purposes. The spectral band around 650 nm seems effective in making the photosystem II functional.