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- Title
On the Delimitation of Chlorophyll Formation after an Irradiation with a Sharply Defined Light Area.
- Authors
Virgin, Hemming I.; Arvidsson, Lars G.
- Abstract
Leaves of dark grown wheat seedlings have been irradiated for a few minutes with a strictly defined beam of red light. After a stay in darkness for six hours the whole leaves were irradiated for three hours. The pre-irradiated spot will then stand out greener than the rest of the leaf, due to accelerated formation of protochlorophyll, earlier described (22), and will consequently show a higher concentration of chlorophyll a. By scanning the leaf with a microphotometer it was shown that no spread whatsoever of the effect of the light impulse takes place, i.e. the phytochrome, which is one of the light absorbing systems, exerts its effect strictly locally. This is in contrast to many other red light effects on photomorphogenetic phenomena characterized by a rapid spread of the stimulus. The two kinds of phytochrome actions are discussed.
- Subjects
LEAVES; WHEAT; CHLOROPHYLL; MICROPHOTOMETER; LIGHT; SEEDLINGS
- Publication
Physiologia Plantarum, 1968, Vol 21, Issue 6, p1177
- ISSN
0031-9317
- Publication type
Article
- DOI
10.1111/j.1399-3054.1968.tb07347.x