Plant Tissues
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PLANT TISSUES
CHAPTER 7General Botany
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Tissues
- are group of ceIIs performing the same function
- ceIIs that are structurally and/functionally similar
Types:
A. Meristematic tissues (meristems)
B. Permanent tissues
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- composed of actively dividing ceIIs, responsible for the production of ceIIs.
Kinds of meristems: Apical meristems – found at the tip of stems & roots Lateral meristems – a.k.a. cambia (singular:cambium)
- found along the sides of roots & stems
- increase width or diameter of stems & roots - types: 1. vascular cambium 2. cork cambium
Intercallary meristems – found at the bases of young leaves & internodes
- responsible for further lengthening of stems & leaves
A. Meristematic tissues
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B. Permanent tissues
- tissues that attained their mature form and perform specific functions
- they stop dividing
Types: Simple permanent tissues Complex permanent tissues
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Simple permanent tissues- consist only of one kind of cells
A. Dermal / surface tissue- external tissues- forms protective covering of the plant body
a. epidermis b. periderm
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Epidermis- the outermost layer of the primary plant
body - covers the leaves, floral parts, fruits, seeds, stems and roots
- generally only one layer thick with cuticle
- composed mostly of unspecialized cells, either parenchyma and/or sclerenchyma
- contains trichomes, stomata, buIIiform ceIIs (in grasses)
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Structure of epidermis
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• Stomata - pores for gas exchange - present on one or both surfaces of
Ieaves
epidermaI ceIIInner waII of the guard ceII
nucIeus
stomataI porechIoropIast
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• Cuticle – Iines the outer waII of the epidermal ceIIs - made up of waxy material that protects plants from desiccation
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• trichomes – outgrowths of epidermal ceIIs-
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Periderm (Bark)-is the outermost layer of stems and roots of
woody plants such as trees.
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B. Ground tissues1. Parenchyma
- are the general purpose ceIIs of plants - cells are rounded in shape & have uniformly thin walls found in all parts of the plants. - living at maturity, have large vacuoles - location Ieaf, stem (pith), roots, fruits
Functions:*basic metabolic function (respiration, photosynthesis
(chIorenchyma in Leaf) & protein synthesis)*storage (potatoes, fruits, & seeds)*wound healing and regeneration
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chIorenchyma- a specialized parenchyma tissue found in the green parts of the shoot and performs photosynthesis.
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2. CoIIenchyma
- Greek word kolla which means “glue”
- cells are elongated (up to 2mm long) with unevenly thickened walls ( thin on the sides but thick at the
angles where 2 or more cells meet)- differentiate from parenchyma cells & are alive at
maturity Functions: Support & elasticity (stem surfaces & along leaf veins) regeneration
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3. ScIerenchyma- sclerenchyma cells which are non-
living and lack protoplasts at maturity
- have thick, lignified secondary walls
- provide strength and support in parts that have ceased elongating or mature
Types:1. scIereids or stone cells2. fibers
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fibers
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scIereids in pear fruit
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Complex Permanent Tissues
Vascular Tissues - specialized for long-distance
transport of water and dissolved substances.
- contain transfer ceIIs, fibers in addition to parenchyma and conducting ceIIs
- location, the veins in Ieaves types1. Xylem
2. phloem
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Xylem- GW xyIos w/c means “wood”
- transports water and dissolved nutrients from the roots to aII parts of a plant.
- direction of transport is upward
2 types Primary xylem – differentiates from procambium in the
apical meristem & occurs throughout the primary plant body.
Secondary xylem – differentiates from vascular cambium & is commonly called wood.
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Xylary elements – the conducting cells in xylem- 2 kinds of xylary elements: tracheids – the only water conducting
cells in most woody, non flowering plants.
vessel elements – occur in several groups of plants, including angiosperm.
- both are elongated, dead at maturity, lignified secondary cell walls
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longitudinal section cross section Primary xylem
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PhIoem- Greek word phloios meaning, “bark”
- transports dissolved organic / food materials from the Ieaves to the different parts of the plant
- glucose in phloem moves in aII directionsTypes1. Primary phloem – differentiate from procambium and
extends throughout the primary body of the plant. 2. Secondary phIoem – differentiates from the vascular
cambium and constitute the inner layer of the bark.
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Sieve tube elements – main conducting ceIIs of phloem
- elongated and non-nucleated
- uniformly thin walled with the end walls perforated to from the sieve plate.
- sieve tube element are attached end to end to form the sieve tube.
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