difimation of all parts of monocot roots
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Epiblema is single layered, thin walled, colorless, polygonal without intercellular spaces, with presence of unicellular root hairs, hence also called as piliferous layer or rhizodermis.
Cortex may be heterogeneous with outer dead exodermis.
Endodermis consists of barrel shaped parenchyma without intercellular spaces. Casparian stripes are little present but passage cells are absent.
Pericycle gives lateral roots only, secondary growth is absent.
Vascular bundles are radial; Xylem is exarch, bundles more than six. Metaxylem elements are oval or circular.
Conjunctive tissues are limited or even absent.
Pith is large or rarely reduced.
Cortex may be heterogeneous with outer dead exodermis.
Endodermis consists of barrel shaped parenchyma without intercellular spaces. Casparian stripes are little present but passage cells are absent.
Pericycle gives lateral roots only, secondary growth is absent.
Vascular bundles are radial; Xylem is exarch, bundles more than six. Metaxylem elements are oval or circular.
Conjunctive tissues are limited or even absent.
Pith is large or rarely reduced.
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Explanation:It is the outermost layer of young root which has thin-walled cells. Some of the cells give rise to root hairs. They have a gummy pectic layer on the outside for cementing with soil particles and retaining water.
Root hairs are tubular in outline and lie in contact with soil water. Both epiblema and root hairs are devoid of cuticle. They take part in the absorption of water and mineral salts. In older parts the epiblema is shed or becomes impervious.
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