Secretory Cells and Tissues in Plants
(Structure and Classification of Secretory Tissue System in Plants with Examples)
What are plant secretions?
Most of the plants release many substances from their cell cytoplasm to the exterior and they are called as Plant-secretions. Among these secretions, some are beneficial to the plant and some are not. The beneficial substances secreted from the plant parts are called as secretions. The chemical composition of plant secretions highly varies. The secretions may be water, nectar, salt, tannins, resins, latex, gums, digestive enzymes, hormones etc.
Cells or tissue associated with or facilitate the secretion is termed as the secretory cell or secretory tissue. The structure, arrangement and the origin of secretory cells/tissues highly varies.
Classification of Secretory Tissues
Ø The secretory tissue is broadly classified into two categories based on their position in the plant body. They are
(I). External secretory tissue
(II). Internal secretory tissue