Presentation on theme: "PLANT TISSUE SMAK BPK PENABUR SUKABUMI GRADE XI – SCIENCE CLASS"— Presentation transcript:
1PLANT TISSUE SMAK BPK PENABUR SUKABUMI GRADE XI – SCIENCE CLASS Lectures by : Agustina Eka H.,S.SI.
2TISSUE ??the smallest basic unit of cells a group of cells that have similar forms, composition, and function a unit of several types of tissues that are close to each other and support certain functions some organs which are coordinate each other and conducting certain functionscellstissueorganOrgan systemorganism
4Meristematic Tissue have thin cellulose cell walls. The meristematic cells may be spherical,oval,polygonal or rectangular in shape.compactly arranged & do not contain any intercellular space between them.contains dense or abundant cytoplasm & a single large nucleus.contain few vacuoles or no vacuoles at all
5Apical meristemsAre located at the tips of roots and in the buds of shootsElongate shoots and roots through primary growthThe root tip is covered by a root capPrimary meristem
6Lateral Meristem cambium : Vascular cambium Cork cambium Add thickness to woody plants through secondary growthSecondary meristemcambium :Vascular cambiumCork cambium
7Vascular cambium Located between xylem and phloem X C P Vascular Types of cell division. An initial can dividetransversely to form two cambial initials (C)or radially to form an initial and either axylem (X) or phloem (P) cell.(a)Accumulation of secondary growth. Although shown hereas alternately adding xylem and phloem, a cambial initial usuallyproduces much more xylem.(b)
8Primary growth in stems Secondary growth in stems An overview of primary and secondary growthIn woody plants,there are lateralmeristems thatadd secondarygrowth, increasingthe girth ofroots and stems.Apical meristemsadd primary growth,or growth in length.VascularcambiumCorkLateralmeristemsRoot apicalPrimary growth in stemsEpidermisCortexPrimary phloemPrimary xylemPithSecondary growth in stemsPeridermPrimaryphloemSecondaryVascular cambiumxylemShoot apical(in buds)The corkcambium addssecondarydermal tissue.The vascularxylem andphloem.
9Intercalary meristem Intercalary meristem : located between mature tissues, ex : base of nodes in grass stemGramineae or Poaceae(rice, corn, sugar cane)
10Epidermis Outer layer Tightly cell Function : to protect the underlying cellModification : hair, spine, trichome, stomata, lenticell, root hair, cuticule
15Chollenchyma Function : supporting and strengthening tissue Cellulose and pectin thickening in the corner of the cell
16Sclerenchyma Function : organ support Inactive cell Cellulose and lignin thickeningSclereids :Hard and rigidStem cortex, leaf venetin, root, fruit, and seedFiber:hard elongated cellsGymnosperm woody fiber, bark, leaf fiber, seed fiber
17Sclerenchyma SCLERIDS FIBERS Right-hand illustration modified from: Weier, Stocking & Barbour, 1974, Botany: An Introduction to Plant Biology, 5th Ed.