ABSTRACT
This chapter describes the main sites of synthesis and storage of the major specialized metabolites, with particular reference to the secretory structures that produce lipophilic substances.
2.2 Secretion In general terms, secretion is the passage of substances produced by the cell from the inside to the outside of the plasma membrane; secreted substances (the products of secretion) play a special function in organs or tissues where they are produced. The term secretion is often used together
2.1 Introduction ............................................................................................... 9 2.2 Secretion ..................................................................................................... 9 2.3 Glandular trichomes............................................................................... 12 2.4 Secretory cavities and resin ducts ........................................................ 16 2.5 Lysigenous cavities ................................................................................. 17 2.6 Oil-bearing cells and secretory cells associated with bacteria ........ 17 2.7 Laticifers ................................................................................................... 18 References .......................................................................................................... 19
with the term excretion and the literature reports numerous attempts to dene the two terms. In animal biology, excretion means the process related to substances that no longer have any use for the body and therefore are excluded from cells. On the other hand, secretion is the process of elimination of molecules that have a particular function in the organism’s growth and development processes (Fahn 1988).
