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THE EFFECT OF SIMAZINE ON THE PHOTOFIXATION OF CO 2 AND ON TRANSLOCATION OF ASSIMILATES IN NORWAY SPRUCE ( PICEA ABIES )
Author(s) -
LUNDHÖIE K.
Publication year - 1969
Publication title -
weed research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.693
H-Index - 74
eISSN - 1365-3180
pISSN - 0043-1737
DOI - 10.1111/j.1365-3180.1969.tb01472.x
Subject(s) - chromosomal translocation , simazine , picea abies , apoplast , botany , shoot , chemistry , horticulture , incubation , biology , agronomy , pesticide , cell wall , atrazine , biochemistry , gene
Summary. A method of exposing seedlings of Norway spruce (Picea abies (L.) Karst.) to 14 CO 2 is described. Within the 1st hr alter 14 CO 2 exposure, no translocation of the 14 C out of the treated branch could be observed. After a 24‐hr period, however, the 14 C in dormant seedlings had been translocated basipetally to part of the root system only, with no lateral diffusion of the 14 C‐compounds in the stem. About a week after exposure, both symplastic and apoplastic patterns of translocation had caused a more uniform distribution of 14 C. In seedlings at active internode elongation, the translocation patterns were fundamentally identical to those in dormant seedlings, but the active shoot growth had led to a more uniform distribution of the 14 C. Simazine at 20 ppm had apparently stimulated both the photofixation of 14 CO 2 and the rate of translocation of the 14 C‐assimilates. At 30 ppm, however, simazine had blocked the translocation of nutrients to the roots. On the other hand, the 14 CO 2 uptake was not influenced. The simazine incubation had apparently no influence on the synthesis of cationic photosynthate.