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Plant Physiology 62:779-780 (1978) © 1978 American Society of Plant Biologists Seasonal Variation in the Hormone Content of WillowII. Effect of Photoperiod on Growth and Abscisic Acid Content of Trees under Field Conditions 1
Centro de Pesquisas do Cacau-CEPLAC, Caixa Postal 7, Itabuna, Bahia, Brazil, Department of Botany and Microbiology, University College of Wales, Aberystwyth, Wales
Levels of abscisic acid were followed in the xylem sap, mature leaves, and apices of field-grown willow (Salix viminalis L.) during the summer months, under natural and artificially extended photoperiods. Although the long day treatment prevented the general onset of dormancy, the plants grown under natural daylengths showed lower concentration of abscisic acid than those kept under long days.
1 This paper represents part of the Ph.D. dissertation of R. A., whose work was supported by the "Conselho Nacional de Pesquisa" (Brazil), by the Ministry of Overseas Development (Great Britain), and by the Cacao Research Center (CEPLAC, Brazil).
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