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A RE‐EXAMINATION OF THE INFLUENCE OF LIGHT AND DARKNESS ON THE LONG‐DISTANCE TRANSPORT OF DIQUAT IN LYCOPERSICON ESCULENTUM MILL.
Author(s) -
SMITH J. M.,
SAGAR G. R.
Publication year - 1966
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.1365-3180.1966.tb00897.x
Subject(s) - diquat , lycopersicon , darkness , chemistry , botany , biochemistry , biology , paraquat
Summary. Using autoradiographic techniques, the long‐distance transport of ‘ethylene’ 14 C‐labelled diquat dibromide was studied. It was confirmed that a period of darkness after diquat application was necessary for reliable systemic action during a subsequent light exposure. Darkness was necessary in the region where the herbicide was applied, and then only to allow adequate penetration of diquat. This was its only role. Desiccation following death, with the transfer of free water containing diquat to other leaves are the primary forces of long‐distance transport; light is essential only for rapid toxic action and not directly for transport. Orthophosphate‐ 32 P and urea‐ 14 C applied topically with unlabelled diquat were distributed in the same pathway as the herbicide and not in the phloem. These results are discussed. Nouvelles recherches sur l'influence de la lumière et de l'obscurité sur le transport à longue distance du diquat dans Lycopersicon esculentum Mill .