Anatomy of Flowering Plants
IMPORTANT TERMS:
· Abscission: A process in which an organ is detached from a plant by means of physiological mechanism.
v Acticlinal: Perpendicular to the nearest surface of an organ.
v Annual Ring: Ring of xylem in wood which indicates an annual increment of growth in trees growing in temperate regions.
v Bifacial Leaf: A leaf having structurally distinct upper and lower surface.
v Bordered Pit: A pit in a tracheid or vessel member having a distinct rim of the cell wall overarching the pit membrane.
v Casparian Strip: A band around each endodermal cell in which the radial and transverse cell walls are impregnated with suberin.
v Cutinization: Impregnation of cell wall with a substance called cutin.
v Differentiation: Developmental change of a cell tissue or organ, leading to features that support the performance of specialized functions.
v Heartwood: The central wood of old secondary stems that is plugged with resins and tyloses, and is not active.
v Isobilateral Leaf: A leaf having the upper and lower surfaces and anatomy essentially similar.
v Isodiametric: Having diameters equal in all directions, as a ball.
v Leaf Scar: Characteristic scar on stem axis made after leaf abscission.
v Lignin: A polymeric substance formed by linking together molecules derived from coniferyl alcohol.
v Lenticel: A structure of the bark that permits the passage of inward and outward.
v Pectin: A class of polymers of the cell wall that are built chiefly of partially oxidized sugars.
v Plasmodesmata: Fine protoplasmic strands connecting the protoplasm of adjacent cells.
v Sapwood: Peripheral wood of old secondary stem that actively transport the sap.
v Simple Pit: A pit not surrounded by an overarching border.
v Suberin: A waxy material found in cell walls or cork tissue and endodermis.
v Tylosis (PI.Tyloses): A growth of one cell into the cavity of another.
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