Plant tissues PPT BY :- Dr. Anurag Singh Titov

1. Plant Tissues
By
Dr. Anurag Titov
Professor
Govt. Madhav Science PG College,
Ujjain

2. Cell
Tissues
Tissue System
Organ
Organ System
Organism

10. Meristematic Tissue
• Cells capable of division
• No intercellular spaces
• Active metabolism no food storage
• Cells may be round, oval, rectangular or
polyhedral
• Dense protoplasm
• Thin cell wall of cellulose
• Conspicuous nucleus
• Vacuoles absent or very small

11. Classification based on Position
• Apical Meristem
1. Dermatogen
2. Periblem
3. Plerome
• Lateral meristem
• Intercalalary Meristem

13. Classification based on stage of
development
• Promeristem or primordial meristem
Group of young meristematic cells in early embryonic stage
at the shoot and root tip of a plant from which the other
meristems are derived.
It forms the primary meristem in plants.
Apical meristems are derived from promeristem and are
present below the promeristem at shoot tip and root tip.
They continuously divide and form permanent tissues in
plants
Also called as Urmeristem or Embryonic meristem

14. • Primary Meristem
• Secondary meristem
Classification based on Origin

15. • According to Haberlandt
1. Protoderm
2. Procambium
3. Ground Meristem
Classification based on Function

16. Permanent Tissues
1. Simple:
a. Parenchyma : Living thin walled, isodiametric
cells, with or without intercellular spaces.
Help in food storage, exchange of gases and
photosynthesis

18. b. Collenchyma : Living cells with thickened
walls due to cellulose or/ and lignin.
3 types angular, lacunar and Lamellar
Provide strength, make hypodermis, storage and
photosynthesis.

19. c. Sclerenchyma: Dead cells, lignified thick walls.
Provide mechanical strength.
Sclerieds or stone cells: Cells of same shape present in pith,
cortex, pericycle & fruit pulp
Fibres: Long with lignified wall, narrow lumen, tapering ends.
Provide strength. Present in phloem, xylem and pericycle

21. 2. Complex;
1. Xylem: Tracheids, Vessels, parenchyma &
Fibres
2. Phloem: Sieve tubes, companion cells,
parenchyma & Fibres

27. 3. Special tissues: Glands secrete Oil, gum, resin etc.
a. Glandular b. Laticiferous

61. Organization of Shoot Apical Meristem
• Regions of Shoot Apex : Wardlaw (1957) described 5
regions

62. Foster (1939) identified for regions in Ginkgo biloba
Popham & Chan (1950) and Singh & Singh (1970) reported
cambium as additional region

63. • Apical cell Theory: Hofmeister (1857) proposed, Nageli (1878)
explained

64. • Histogen Theory: Hanstein (1870)

65. • Tunica Corpus Theory : Schmidt (1924)

66. • Histogenic Layer Concept: Derman (1947)
L1 – Epidermis
L2 – Cortex
L3 – Stele

67. • Mantle- Core Concept: Popham and Chan (1950)

68. • Annaeu initial & meristeme d, attentae theory:
Buvat (1955)