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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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1.2.1 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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2.1.3 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
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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 (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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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
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