What structural changes do the cells undergo during differentiation as tracheary elements?
The cells undergo the following structural changes during the process of differentiation as tracheary elements.
i. The cells lose their protoplasm to form tracheary elements.
ii. They also develop a very strong, elastic,
lignocellulosic secondary cell walls, to carry water to long distances even under extreme tension.
Auxins are of two types :
(1) Natural auxins : These are naturally occuring auxins, isolated from plants and are regarded as phytohormones e.g. IAA. NAA etc.
(2) Synthetic auxins : These are synthesized by artificially e.g. IBA 2,4-D etc.
Auxin was isolated by F.W. Went from tips of coleoptiles of oat seedling.