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Effects of Intermittent and Continuous Light on the Chlorophyll Formation in Etiolated Plants at Various Ages
Author(s) -
Akoyunoglou G.,
ArgyroudiAkoyunoglou J. H.
Publication year - 1969
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.1399-3054.1969.tb07377.x
Subject(s) - chlorophyll , protochlorophyllide , etiolation , chlorophyll a , chlorophyll b , biology , botany , horticulture , chemistry , chloroplast , biochemistry , enzyme , gene
The effect of the tissue age of dark‐grown bean plants on the chlorphyll formation under continuous illumination or short impulses of white light has been studied. It was found that the protochlorophyllide present in the tissue is age‐dependent and reaches a plateau at about 10 days of age, as judged by the chlorophyll formed in etiolated plants of various ages after 5 min illumination. The amount of chlorophyll a and chlorophyll b formed under short impulses of while light increases up to about 9 days of age and thereafter decreases. However, the decrease in chlorophyll a is sharper than that of chlorophyll b, the amount of which remains almost constant. The ratio of chlorophyll a lo chlorophyll b under the short impulses of white light is higher in the younger plant. Similar results are obtained after transfer of the plants from the flashing light to continuous illumination In the young plant there is no lag phase in the chlorophyll biosynthesis while as the age is increased the lag phase is evident and its duration increases as the plant ages. After protochlorophyllide phototransformation under continuous illumination the lag phase in chlorophyll biosynthesis is also age‐dependent. Leaves up to 5 days old show no lag phase in chlorophyll synthesis; after this point, however, the lag phase's duration increases continuously with age.