Anatomy of angiosperms,cell wall PPT4.pptx

Anatomy of angiosperms,cell wall PPT4.pptx

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  DISCOVER . LEARN. EMPOWER University Institute of Biotechnology M.Sc. Botany Course Name – Anatomy of Angiosperms Course Code – 23SBT-702 Faculty Name – Dr. Aditi
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  2 Cell Wall andApical Meristem
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  3 Plasmodesmata • Plasmodesmata areprotoplasmic strands that connect the protoplasts of neighboring cells. • Diameter is 40-50nm. • Easily seen in endosperm of seeds such as Phoenix , Aesculus , Diospyros and in cotyledons of some plants.
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  5 STRUCTURE OF PLASMODESMATA •Plasmodesmata is lined by plasma membrane. • It encloses tubular extensions of endoplasmic reticulum called desmotubule. • The space between desmotubule and plasma membrane contain 8 – 10 microchannels.
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  6 Components of plasmodesmata
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  7 CLASSIFICATION OF PLASMODESMATA Onthe basis of origin: • primary plasmodesmata • secondary plasmodesmata On the basis of branching: • branched plasmodesmata • Unbranched plasmodesmata
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  8 Structure of plasmodesmata:A) Simple, B) Branched (as between sieve tube cells and companion cells)
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  9 FUNCTION OF PLASMODESMATA •Transport of materials and relay of stimuli. • Regulate traffic of molecules between cells. • Important role during development of organelle. • Involved in short distance movement of viruses.
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