Ontogeny, anatomy and systematic significance of ovular structures in the `eucalypt group' (Eucalypteae, Myrtaceae) |
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Authors: | A Bohte A Drinnan |
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Institution: | (1) School of Botany, The University of Melbourne, Victoria, 3010, Australia |
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Abstract: | Development of ovular structures in the `eucalypt group' (Eucalyteae, Myrtaceae) was investigated using scanning electron
microscopy and light microscopy. Different modes of placental expansion account for the variation in initiation and arrangement
of ovules and ovulodes. In Eucalyptus sensu stricto placental elongation proceeds proximally and the distally-positioned ovulodes
develop from the first primordia initiated (congenital ovulodes). In Angophora, Corymbia, Arillastrum, Allosyncarpia and Stockwellia placental elongation is bi-directional and the ovulodes develop from last-initiated primordia (residual ovulodes). Bi-directional
elongation and residual ovulodes are present in the outgroup taxon Lophostemon confertus and is presumably plesiomorphic. This suite of characters is potentially informative for resolving relationships for several
key taxa: E. microcorys (subgenus Symphyomyrtus) has proximal placental expansion and congenital ovulodes, which is consistent with most Eucalyptus; E. curtisii (subgenus Gaubaea) has the plesiomophic condition and may be sister to all other species of Eucalyptus. |
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Keywords: | Eucalypt Eucalyptus Myrtaceae ovule developmentovulodes |
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