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Some Effects of Triazines on Growth, Photosynthesis and Translocation of Photosjuthate in Pinus Species
Author(s) -
SHAUKAT S. SHAHID,
MOORE K. G.,
LOVELL P. H.
Publication year - 1975
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.1399-3054.1975.tb03172.x
Subject(s) - simazine , atrazine , chlorosis , biology , photosynthesis , botany , chromosomal translocation , pinus <genus> , horticulture , agronomy , pesticide , biochemistry , gene
The effects of triazines on growth, 14 CO 2 ‐fixation and translocation of 14 C‐assimilates by young Pinus seedlings were investigated. Post‐emergenceroot application of moderate and high concentrations of simazine and atrazine resulted in severe toxicity to the seedlings of Pinus nigra and P. coniorta as depicted by reduction in dry weight, chlorosis, wilting and mortality. Atrazine was more toxic than simazine and P. nigra was more susceptible than P. contorta to both the triazines. Simazine treatment to the roots of P. nigra seedlings, not only caused inhibition of 14 CO 2 ‐fixation but also reduced the short‐term downward transloca‐tion of l4 C‐assimilates. Various possible mechanisms whereby simazine reduced the downward movement of I4 C‐assimilates in Pinus seedlings are discussed.