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The effect of phosphite on meiosis and sexual reproduction

Fairbanks, M.M., Hardy, G.E.St.J. and McComb, J.A. (2003) The effect of phosphite on meiosis and sexual reproduction. In: Phytophthora in Forests and Natural Ecosystems: 2nd International IUFRO Working Party 7.02.09 Meeting, 30 September - 5 October, 2001, Albany, Western Australia pp. 167-172.

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The fungicide phosphite was found to reduce pollen fertility in Australian and exotic species. In the perennial Dryandra sessilis the reduction was evident for a year after treatment with 2.5-10 gL-1 phosphite sprayed to run off. Pterochaeta paniculata, an annual, showed reduced pollen fertility in flowers that opened 16-30 days after spraying. The horticultural species Pelunia hybrida and Tradescantia virginiana also displayed reduced pollen fertility after phosphite treatment. Pollen mother cells of Tradescantia had a significant percentage of abnormal first and second divisions and micronuclei in the microspores for up to one month after spraying. There was evidence that phosphite induced premature tapetum breakdown in Pelunia but not Tradescantia. The percentage of abnormal meiotic cells and the frequency of premature tapetum breakdown appeared insufficient to account for the high levels of pollen infertility observed after phosphite treatment.

Item Type: Conference Paper
Murdoch Affiliation(s): Centre for Phytophthora Science and Management
Publisher: Centre for Phytophthora Research and Management, Murdoch University
Copyright: (c) Centre for Phytophthora Research and Management
Notes: 'Phytophthora in Forests and Natural Ecosystems'. 2nd International IUFRO Working Party 7.02.09 Meeting, Albany, W. Australia 30th Sept.- 5th Oct 2001 Eds. JA McComb, GE StJ Hardy and IC Tommerup (Murdoch University Print) pp 167-172
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