plant science - types of tissue

main tissue systems of a plant

ground, vascular, dermal

simple tissues composed of?

mostly a single cell type

simple tissues functions

essential functions like photosynthesis, support, storage, and regulation

simple tissues main types

parenchyma, collenchyma, sclerenchyma

parenchyma cell walls

thin primary, lignified secondary

parenchyma cells function

photosynthesis, respiration, storage, and secretion

parenchyma cells unique feature

when mature, can be reprogrammed to form other cell types

parenchyma tissues that can form

cortex, pith, and mesophyll

cortex and pith

storage and support

mesophyll

photosynthetic and regulatory

collenchyma cell wall

alternating layers of pectin and cellulose

collenchyma function

provides support to young stems and leaves allowing growth

Sclerenchyma cell wall

thick, lignified. dead at maturity

types of sclerenchyma cells

fibers and sclerids

fibers

can aggregate into continuous cylinder around stems/form strands

sclerids

can form sheets/small clusters

complex tissue

interconnected network of cells traversing entire plant

complex tissue composed of

vessel elements and tracheids, fibers, living parenchyma cells, sieve-tube members, companion cells

complex tissue

epidermis and periderm

epidermis

single layer of cells the outer part of the plant - covered in cutin

complex tissues is composed of

Epidermal cells, Guard cells: specialized, Subsidiary cells

trichomes

outgrowths of one or more cells

Periderm

A protective layer that forms in older stems and roots

periderm is composed of

phellum (cork), Phellogen or cork cambium, Phelloderm:

Phellum (cork)

cells on the outside. Dead at maturity and with waxy suberin embedded in the cell walls

phelloderm

parenchyma-like cells between the cork cambium and cortex.