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THE INFLUENCE OF LIGHT QUALITY ON CARBOHYDRATE TRANSLOCATION WITHIN CORN LEAF STRIPS
Author(s) -
HODDINOTT J.
Publication year - 1983
Publication title -
new phytologist
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.742
H-Index - 244
eISSN - 1469-8137
pISSN - 0028-646X
DOI - 10.1111/j.1469-8137.1983.tb03449.x
Subject(s) - chromosomal translocation , strips , phaseolus , phytochrome , darkness , red light , biology , botany , far red , biophysics , chemistry , biochemistry , materials science , gene , composite material
To test the effect of light quality on carbohydrate translocation, leaf strips of Phaseolus vulgaris L. cv. Black Valentine were prepared before or after exposure to a 48 h dark pretreatment. Central portions of the strips were labelled with 14 CO 2 and translocate was allowed to move acropetally and basipetally along the strips. The portions of the strips on either side of the labelling region were exposed to red or far‐red light, or darkness. Translocation in darkened strips was predominantly basipetal. When portions of the strips were given red light, translocation to that region was suppressed. It is suggested that P tr does not promote unloading. P r formation induced by far‐red light, or dark decay of phytochrome, promotes unloading and long distance transport in a high irradiance response, but does not alter the normal polar transport in the strips.