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  • Print publication year: 2005
  • Online publication date: June 2012

Chapter 8 - The epidermis

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Summary

Perspective

Most terrestrial plants live in a highly evaporative environment and one in which they are constantly exposed to toxic substances, to attack and invasion by various small insects and pathogens, to the potentially damaging effects of solar radiation, and to potential damage from high winds. Consequently, several protective tissues have evolved that reduce water loss from the plant, restrict the entry of organisms and toxic substances into the plant body, mitigate the effects of radiation, and strengthen and support the plant thereby reducing its susceptibility to damage from rapid air movement. These include the epidermis of shoot and root systems (sometimes called rhizodermis in the root), the periderm and the rhytidome. These tissues, while providing these functions, must also under certain conditions allow oxygen used in respiration to enter the plant and carbon dioxide utilized in photosynthesis to exit the plant. Consequently, the epidermis and other surficial, protective tissues represent both structural and functional compromises. As the bounding tissue of all young parts of a plant, and of the aerial parts of plants that are comprised solely or largely of primary tissues, the epidermis also provides an important supporting function. In the stem of Tulipa (tulip), for example, the epidermis plus a layer of subepidermal collenchyma can contribute as much as 50% to overall stem stiffness (Niklas and Paolillo, 1997). We shall consider the epidermis in some detail in this chapter, and periderm and rhytidome in Chapter 13.

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An Introduction to Plant Structure and Development
  • Online ISBN: 9781139165365
  • Book DOI: https://doi.org/10.1017/CBO9781139165365
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References
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Further reading
Behnke, H.-D. 1984. Plant trichomes – structure and ultrastructure: general terminology, taxonomic applications, and aspects of trichome-bacteria interaction in leaf tips of Dioscorea. In Rodriguez, E, Healey, P. L., and Mehta, I., eds., Biology and Chemistry of Plant Trichomes. New York: Plenum Press, pp. 1–21
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Uphof, J. C. T. 1962. Handbuch der Pflanzenanatomie, vol. 4, part 5, Plant hairs. Berlin: Gebrüder Borntraeger
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