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In this article we will discuss about the anatomy of Acacia moniliformis.
Acacia moniliformis (Common Name: Australian Acacia; Family – Mimosoideae):
T. S. of the material is fiat, appeals leaf like and reveals following tissues:
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Epidermis:
1. A single row of epidermal cells is present on upper as well as lower surfaces.
2. Outer wall of the epidermal cells is thickly cuticularized.
3. Epidermis is interrupted by many sunken stomata each with a clear sub-stomatal chamber.
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4. Cells of the epidermis are rectangular in shape but two extreme ends of the section possess radially elongated cells.
PaIisade:
5. Just below the epidermis are present few layeres of palisade.
6. Palisade cells are radially elongated and filled with many chloroplasts.
7. Many intercellular spaces are also present in the region.
Parenchyma:
8. Next to the palisade is the parenchyma region which is well developed and central in position.
9. The region consists of thin walled, rounded cells with many intercellular spaces.
Vascular Tissue:
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10. Vascular bundles are many and arranged below the palisade.
11. There are two big vascular bundles in the centre facing their xylem to each other. One big vascular bundle is present at each comer. Many smaller vascular bundles are present inner to the palisade.
12. Central and comer vascular bundles are bigger in size and remain surrounded by well developed sclerenchyma.
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13. Smaller vascular bundles arc surrounded by a layer of thin walled cells.
14. Vascular bundles are composed of xylem and phloem.
15. Xylem in each vascular bundle faces towards the centre and consists of tracheids, vessels and xylem parenchyma.
16. Phloem consists of sieve tubes, companion cells and phloem parenchyma, and faces towards the outer side or epidermis.
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Xerophytic Points:
(a) Thick cuticle and radially elongated epidermal cells.
(b) Sunken stomata.
(c) Well developed sclerenchyma.
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Leafy Character:
(a) Palisade tissue is present.
Petiole Characters:
(a) Vascular bundles in a ring.
(b) Central and comer bundles are large in size.
