Localisation and expression of arabinogalactan-proteins in the ovaries of Nicotiana alata Link and Otto |
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Authors: | Alison M. Gane Adrienne E. Clarke Antony Bacic |
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Affiliation: | (1) Plant cell Biology Research Centre, School of Botany, University of Melbourne, 3052 Parkville, Victoria, Australia;(2) Present address: Department of Consumer Sciences, University of Otago, PO Box 56, Dunedin, New Zealand |
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Abstract: | The transmitting-tissue cells of the style of flowering plants secrete a complex extracellular matrix through which pollen tubes grow to the ovary to effect fertilisation. This matrix is particularly rich in a class of proteoglycans, the arabinogalactan-proteins (AGPs). AGPs from the ovary of Nicotiana alata were found to be developmentally regulated, as the different charge classes of AGPs altered during floral development. The AGPs from the mature ovary had charge characteristics that were distinct from those previously reported for the stigma and style. However, the concentration of AGP (0.6 g/ml fresh weight) in the ovary did not change during development, or in response to either compatible or incompatible pollination. The AGPs of the ovary are mainly associated with the epidermis of the placenta. |
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Keywords: | Arabinogalactan-proteins Ovary Nicotiana Pollination Flower development |
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