Releasing primary dormancy in <Emphasis Type="Italic">Avena fatua</Emphasis> L. caryopses by smoke-derived butenolide |
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Authors: | Jan K?pczyński Danuta Cembrowska Johannes Van Staden |
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Institution: | (1) Department of Plant Physiology, University of Szczecin, Wąska 13, 71-415 Szczecin, Poland;(2) Research Centre for Plant Growth and Development, School of Biological and Conservation Sciences, University of KwaZulu-Natal Pietermaritzburg, Private Bag X01, Scottsville, 3209, South Africa |
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Abstract: | The effect of smoke and smoke-derived butenolide in releasing dormancy of caryopses (referred to as seeds) of the economically
important weed Avena fatua L. was studied. Seeds of A. fatua are dormant after harvest. Both smoke-water and butenolide, applied continuously, removed dormancy in darkness at 15, 20
and 25°C and slightly at 30°C. Butenolide was very active at a concentration of 10−8 M. Butenolide at 10−8 M was also able to remove dormancy at 20°C when applied for 12 or 24 h at 4°C or for 3 to 24 h at 20°C. Sensitivity to butenolide
decreased with longer preincubation times in water. This compound was less effective in releasing dormancy in the light than
in darkness. Dormancy release by butenolide involves induction of cell-cycle activity just before coleorhiza protrusion. Stimulatory
effects of smoke-water and butenolide were also observed in respect of seedling growth and vigor. |
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