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structureorganization213-page6

structureorganization213-page6 - o Polycarpic perennials...

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Plant Structure and Organization - 6 Plant Life span and Sturdiness of Plants Plants are either herbaceous or woody. Woody plants (shrubs and trees) have significant woody (or tough) parts above the ground that persist year after year. Herbaceous plants do not have such woody parts that persist year after year, are rarely as large as the woody plants and rely on turgor for strength. Herbaceous plants often die back to below-ground parts seasonally. Plants can complete their life cycle in from one to several growing seasons. Annuals are plants that germinate, grow, reproduce and die in one growing season. Arabidopsis thaliana Biennials grow vegetatively in their first growing season and reproduce and die in a second growing season. Most annuals and biennials are herbaceous plants. Perennials grow for several seasons.
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Unformatted text preview: o Polycarpic perennials may reproduce year after year, once reaching sexual maturity. o Monocarpic perennials grow vegetatively for a number of seasons, then reproduce once and die. Perennials can be herbaceous or woody. Some woody perennials, such as the Bristle cone pine, live for thousands of years based on dendrochronology. Using radioactive carbon dating, a Baobob tree in Africa has been determined to be about 6000 years old. Roots of a clonal Norway spruce in Sweden are around 9500 years old and clonal Huon pines in Tasmania are estimated to be around 10,000 years old. It's nearly impossible to date clonal species such as aspen clones that have "short-lived" individual trunks, but one estimate for a clone in Utah indicated the clone might be 800,000 or more years old....
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