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Plant Tissue

Vasakorn Bullangpoti, Ph.D.

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objective

Studies plant tissue type

Understand position and

characterization of each plant tissue

To compare the characterization of

monocot and dicot

free hand section technique

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Diagram

Meristematic

tissue

(เนอเยอเจรญ)

Plant Tissue

Permanent

Tissue

(เนอเยอถาวร)

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I. Meristematic tissues

Apical

meristem

Lateral

meristem

responsible for the increase in diameter

of roots and stems. This is called

secondary growth. Vascular cambium

and cork cambium are two kinds of

lateral meristems

Intercalary

meristem

meristem at the base of the

internode in monocot stems

(particularly grass stems).

(embryonic cells) at the tips of roots

and shoots is responsible for growth

and elongation.

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1.1 Apical meristem

Root cap

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1.1 Apical meristem

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1.2.1 vascular cambium

The vascular cambium, the first type of lateral meristem, is sometimes just called the cambium.

The cambium is responsible for the production of cells and tissues

that increase the thickness, or girth, of the plant.

LATERAL MERISTEM : DICOT ONLY!!!!!!

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1.2.2 Cork cambium

The cork cambium, the second type of lateral meristem.

it is only found in woody plants, as it will produce the outer bark

LATERAL MERISTEM : DICOT ONLY!!!!!!

SUBERIN

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INTERCALARY MERISTEM : MONOCOT ONLY!!!!!!

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2. Permanent Tissue

Simple

permanent

tissue

Permanent

Tissue

Complex

permanent

tissue

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Simple permanent tissue

Simple permanent tissue

Epidermis collenchymaCork Parenchyma Sclerenchyma

fiber sclereid

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2.1.1 Epidermis

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2.1.3 Parenchyma the most common tissue in ground tissue systems.

Cells are pliable, thin walled, and many sided.

Various types of parenchyma participate in photosynthesis,

storage, secretion, and other tasks.

Mesophyll is a type of parenchyma that contains chloroplasts

Intercellular space

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Chlorenchyma : The parenchyma with chloroplast

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2.1.4 Collenchymacells are thickened and help strengthen the plant.

The cells are elongated, with walls (especially corners) thickened with

pectin.

Collenchyma cells are alive at maturity.

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How’s different?

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Parenchyma

Text

Text

Text

Text

Text

Text

Collenchyma

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2.1.5 Sclerenchyma

1

Fiber

2

Sclereid

(stone cell)

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2.1.5 Sclerenchyma

Fiber

Fibers are sometimes found in association with a wide variety of

tissues in roots, stems, leaves and fruits. Usually fiber cells are much

longer than they are wide and have a very tiny cavity in the center of

the cell

LUMEN

CELL WALL

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2.1.5 Sclerenchyma

Sclereid (stone cell)

cells that are randomly distributed throughout other tissues. Sometimes

they are grouped within other tissues in specific zones or regions. They are

generally as long as they are wide. An example, would be the gritty texture in

some types of pears. The grittiness is due to groups of sclereid cells.

Sclereid (stone cell)Fiber

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complex permanent tissue

Complex permanent tissue

Xylem Phloem

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complex permanent tissue

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complex permanent tissue (Xylem)

Xylem

Vessel member: angiosperm Tracheid: Gymnosperm

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complex permanent tissue (Phloem)

1Sieve tube memberWhich makes up vessel of

phloem. They loss of most

organelles but are still alive.

2Companion cellA cell adjacent to the sieve

tube cell that keep the sieve

cell tube alive

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Monocot/ root tissue

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Xylem

Phloem

Sclerenchyma fibers

Dicot/ root tissue

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root tissue

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Working assignment

1 2 3 4

•ศกษาเนอเยอแบบ L-S จากสไลดปลายรากหอม •X-S ของฤาษผสม

Sclerenchyma สไลดล าตนตะขบฝรง ล าตนขาวโพด กะลามะพราวCollenchyma สไลดฤาษผสม พชใบเลยงคParenchyma สไลดฤาษผสม ล าตนขาวโพดEpidermis สไลดล าตนขาวโพด ฤาษผสม ใบพชเลยงเดยวPeriderm สไลดล าตนตะขบฝรงFiber และ chlorenchyma จากวานฝกดาบ

ศกษา X-S ของล าตนฤาษผสมและขาวโพด (สวนประกอบ vascular

bundle)

ตด X-S ของหญาละออง เปรยบเทยบหญาละอองทอวบและไมมดอกทปลายกง และแบบทมดอก ยอมดวยส safarin

หรอ aniline

sulfate เพอศกษา primary growth และ secondary growth

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Lab. results: X-S หญา, ขาวโพด

Vascular tissue, safranin stained

Lab. results: X-S หญาละออง

Vascular tissue, safranin stained

non-living, water-resistant

• protective tissue that displaces the stem epidermis

Simple permanent tissue: Cork

Lab. results: Fiber ของวานฝกดาบ

Safranin stained

Lab. results: Fiber ของวานฝกดาบ

Safranin stained Aniline sulfate stained

Lab. results: Sclerenchyma ของฝรง

Sclereid, safranin stained

Lab. results: Sclereid ของกะลามะพราว

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collenchymaฤาษ