Cytodifferentiation in developing leaves of a leafy liverwort, Plagiochila arctica Bryhn & Kaal. (Hepaticae).
Item
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Title
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Cytodifferentiation in developing leaves of a leafy liverwort, Plagiochila arctica Bryhn & Kaal. (Hepaticae).
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Identifier
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AAI9207046
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identifier
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9207046
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Creator
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Basile, Margaret Ruth.
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Contributor
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Adviser: Thomas E. Jensen
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Date
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1991
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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, Cell | Biology, Botany
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Abstract
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A light and electron microscopic investigation of cytodifferentiation in lateral and ventral leaf primordia of Plagiochila arctica Bryhn & Kaal. (Hepaticae) revealed qualitative and quantitative changes in the structure and organization of the differentiating cells as development progressed from primorida to maturity. The most pronounced changes in those structures already present at the start were observed in the plastids, cell walls, vacuoles and mitochondria. These organelles manifested the greatest changes, both qualitative and quantitative during the course of development. In addition, a peculiar feature of cytodifferentiation in leafy hepatics such as Plagiochila arctica was observed, the de novo development of membrane-bound structures called "oil bodies". The changes observed in the individual organelles including the walls were similar to changes that occur during cytodifferentiation in leaf cells in flowering plants. What was surprising was the fact that each/all of the liverwort leaf cells at maturity were more highly differentiated than individual cells of flowering plants, manifesting features that help characterize three different tissue/cell types in flowering plants: epidermal, mesophyll, and collenchyma.
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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.
