Premium
The Conversion of Protochlorophyllide 636 to Protochlorophyllide 630 in Leaves Treated with δ‐Aminolevulinic Acid
Author(s) -
Sundqvist Christer
Publication year - 1970
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.1399-3054.1970.tb06431.x
Subject(s) - protochlorophyllide , chemistry , darkness , biophysics , in vivo , biochemistry , photochemistry , botany , biology , chloroplast , gene , genetics
Absorbancy changes in dark‐grown, excised wheal leaves fed with δ‐aminolevulinic acid are measured in vivo . The treatment with σ‐aminolevulinic acid caused accumulation of protochlorophyllide, absorbing at 636 nm. After flashlight this form is found to convert in darkness to protochlorophyllide, absorbing at 650 nm. The conversion starts instantly after the leaves have been exposed to the flashlight, and the pre‐existent pool of protocholorophyllidc absorbing at 650 nm will become emptied. The conversion is completed after 15–20 minutes, when a new pool of protochlorophyllide has been filled up. This new pool is transformed to chlorophyllide by a second flash and the sequence is repeated. The conversion may be composed of two reactions, a conclusion which can be drawn from the behaviour at different temperatures. One of these reactions is fairly temperature independent while the other is temperature dependent. The action of the protochlorophyllide holochrome is discussed.