Comparative Biology of the Pollination Mechanisms in Acmopyle pancheri and Phyllocladus hypophyllus(Podocarpaceae s. l.) |
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| Authors: | Moller M; Mill R R; Glidewell S M; Masson D; Williamson B; Bateman R M |
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| Institution: | Royal Botanic Garden Edinburgh, 20A Inverleith Row, Edinburgh, EH3 5LR, UK Scottish Crop Research Institute, Invergowrie, Dundee, DD2 5DA, UK Department of Botany, Natural History Museum, London, SW7 5BD, UK |
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| Abstract: | The pollination mechanisms of Acmopyle pancheri(Brongn. &Gris) Pilg. andPhyllocladus hypophyllus Hook.f. were investigatedby conventional microscopical techniques and by nuclear magneticresonance (NMR) imaging. Dissimilarities include the orientationof the ovule and type of pollen;Phyllocladus has erect ovulesand wettable pollen with vestigial sacci, whereas Acmopyle hasmore-or-less erect ovules and non-wettable, functionally saccatepollen. Similarities include the mode of formation of the pollinationdrop and its response upon pollination. In both genera, pollinationtriggers pollination drop retraction and drop secretion ceases.Neither NMR imaging nor conventional histology of Phyllocladusovules revealed any specific tissue beneath the ovule whichcould be responsible for pollination drop retraction. It ismore likely, therefore, that the drop is channelled into thevascular supply or the apoplast. These findings invalidate thetaxonomic value of the pollination mechanism as a suite of characterstraditionally used to separate Phyllocladaceae from Podocarpaceae.Copyright 2000 Annals of Botany Company Acmopyle pancheri, gymnosperms, NMR imaging, nuclear magnetic resonance imaging, Phyllocladaceae,Phyllocladus hypophyllus , Podocarpaceae, pollination drop, pollination mechanism |
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