Question

Discuss the role of auxin and polar auxin transport in embryo development.

Answer 1

In all multicellular organisms extensive communication is required between cells and tissues in order to coordinate growth and development. Both plants and animals have signaling chemicals, traditionally termed hormones that mediates short and long distance communications. The first phytohormone to be discovered was auxin,a substance that increase wide variety of developmental process. It has been known that unique property of auxin is its directional movement between cells (polar auxin transport).

POLAR AUXIN TRANSPORT (PAT)

It is characterised by its strictly controlled directional movement. The general properties of PAT are that it moves in cell to cell manner,requries energy,is relatively slow,sensitive to protein synthesis inhibitors. Auxin ordinaly transport from apical yissue to the root tips. In the stem, it is found in vascular cambium and xylem parenchyma.