A SYSTEMATIC REVIEW OF THE ACERACEAE.
Item
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Title
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A SYSTEMATIC REVIEW OF THE ACERACEAE.
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Identifier
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AAI8203273
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identifier
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8203273
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Creator
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DELENDICK, THOMAS JOSEPH.
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Contributor
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David E. Giannasi
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Date
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1981
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Language
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English
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Publisher
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City University of New York.
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Subject
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Biology, Botany
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Abstract
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A review of the systematic work of five recent monographers showed sufficient differences to warrant further investigations in the Aceraceae. The present study entailed examination of the flavonoid chemistry of 118 species (of approximately 150) of Acer, the palynology of 94 taxa, the leaf surface morphology (using scanning electron microscopy) of 58 taxa, and seedling morphology of 62 taxa. The same investigations were made on one (of the two) species of Dipteronia, the sole other genus in the Aceraceae.;Fourteen ancillary studies were carried out to determine the extent of variation in the flavonoid pattern of leaves of Acer species. The pattern proved remarkably stable. Significant variation was found only (1) in leaves which were heavily infected with mold and (2) in comparison of true leaves and cotyledons. The latter was most remarkable in that there was usually little overlap in the flavonoid complement of cotyledons vs. true leaves. At the same time, the profile produced by the very first pair of true leaves in the seedling was qualitatively the same as that in leaves from mature trees.;From the systematic point of view, the sections of Acer are circumscribed by their chemistry (130 flavonoids and other phenolic compounds were found) just as they are by morphological characters. Interesting deviations from this rule, however, are to be found in Acer sections Cissifolia and Palmata, which warrant further and fuller investigation. Many unusual chemical types (for the Aceraceae, such as flavone-4'-glycosides, isorhamnetin glycosides and glycoflavones) occur in systematically unrelated taxa. Isorhamnetin is here reported for the first time in the Aceraceae (in Acer sections Macrophylla and Negundo), while additional records for occurrence of glycoflavones, flavone-4'-glycosides and aceritannin are also reported.;In pollen of the Aceraceae, two aperture types and five exine patterns are noted. Colporate, striate pollen grains are here considered as the original type in the family. Details of pollen, leaf surface and seedling morphology are found to correlate with other morphological features in the delimitation of taxonomic groups.;The data generated best support (of the five recent systems) those of Ogata (1967) and Jong (1976). The presence of aceritannin in sections Rubra and Ginnala, for example, lends support to Ogata's association of these taxa. Chemical and morphological data suggest that some of the series recognized by Jong might better be treated as sections.
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Type
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dissertation
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Source
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PQT Legacy CUNY.xlsx
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degree
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Ph.D.
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Program
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Biology
