Primary Internal structure & Normal Secondary growth in Sunflower stem
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1 Primary Internal structure & Normal Secondary growth in Sunflower stem B. Sc. II - Botany Dr. (Miss) Kalpana R. Datar Assistant Professor DEPARTMENT OF BOTANY Willingdon College, Sangli. kalpana_datar@yahoo.com.
2 Primary Internal structure of Sunflower stem Transverse section passing through the internodal region shows three distinct regions 1. Epidermal region - 2. Cortical region- 3. Stelar region-
3 1) Epidermal region- 1. It shows epidermis, cuticle and trichomes. 2. The epidermis i. Single layered, uniseriate. ii. Thin walled, living, barrel shaped or rectangular, compactly arranged cells. iii. Thin cuticle on the outer walls. 3. They are covered with trichomes or multicellular hairs on the outer surface. Function- Protection
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5 b) Cortical region- Extra stelar Ground Tissue- It is divided into three regions 1.Hypodermis i. Just below the epidermis, ii.3-5 layers, made up of collenchyma. iii. Some patches of collenchyma possess chloroplast. iv. intercellular spaces are absent. Function- Gives mechanical support to young stem.
6 2. Cortex i. Present below the hypodermis. ii. Few layers of parenchyma cells. iii. Oval or spherical, thin walled cells. iv. Intercellular spaces are present. v. Few resin ducts are present. Function- food storage & mechanical strength.
7 3.Endodermis i. Innermost layer of cortex. ii. Single layered, barrel shaped parenchymatous cells. iii. Starch grains are abundantly present. so it is also called starch sheath. iv. Casparian strips are present in these cells.
8 c) Stele region (Vascular Region) Tissues internal to the endodermis is called stele. Stele region contains- 1. Pericycle - i. Outermost layer. ii. multilayered, consists of patches of parenchyma alternating with patches of sclerenchyma. iii. In young stem, sclerenchyma patch is present at the cap of vascular bundle near the phloem patch. It is called Hard-bast. (Hard tissue-sclerenchyma & Bast - Phloem tissue. Hard tissue present near to the phloem).it gives mechanical strength to the phloem.
9 Vascular bundles: The vascular bundles are Conjoint (xylem & phloem on the same radius), Collateral(Xylem &phloem lie side by side.), Open(Cambium is present in between xylem &phloem).
10 ii. Vascular bundles are arranged in a ring. iii. Each vascular Bundle contains xylem, phloem and cambium. Stele is Eustele type Xylem- i. contains Protoxylem and Metaxylem elements and xylem parenchyma. ii. Xylem is endarch- Protoxylem towards the centre and metaxylem towards the periphery Phloem: Contains thin walled tissue
11 Phloem: Contains thin walled tissues. Cambium: i. It is a thin strip of actively dividing meristematic cells. ii. It is present in between xylem and phloem. iii. It is made up of 2-3 layer of meristematic cells. iv.the cambium in the vascular bundle is known as Stelar or fascicular cambium or intrastelar cambium or intrafascicular cambium. v. The division of cambium cells adds phloem towards periphery and xylem towards centre.
12 Medullary raysi. These are thin walled, fairly big, polygonal or radially elongated cells. ii. These are present in between the vascular bundles. Pithi. It is present in the centre. ii. It is made up of parenchyma cells, with intercellular spaces.
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14 Secondary growth in Dicot stem- Sunflower stem In intrastelar region Due to Vascular cambium. In extrastelar region- Due to cork cambium or phellogen.
15 In intrastelar region- 1.When the secondary growth begins fascicular/ intrafascicular cambium becomes active. 2.The permanent cells present in between the vascular bundles become meristematic and form cambium strip- Interfascicular Cambium. 3.Intrafascicular and interfascicular cambium grow laterally and forms cambium ring. 4. Activity of cambium ring begins. The cambium is more active on the inner side than the outer side.
16 5.Cambium adds more secondary xylem towards inner side and relatively less amount of secondary phloem towards outer side. 6.The cambium forms radial narrow bands of parenchyma cells running across the secondary xylem and secondary phloem is called as Secondary medullary rays. 7. Primary xylem, Primary phloem and pith gets crushed due to formation of more and more secondary tissues.
17 The extra-stelar secondary growth does not occur in Sunflower stem. Sunflower is annual herbaceous plant,only one xylem ring is formed in it. No initiation of cork cambium hence periderm formation does not occur. Thus the secondary growth in Sunflower stem is restricted to the stelar region only
18 T.S of old Sunflower stem
19 A Phloem Cambium Xylem
20 B
21 C Cambium Ring
22
23 5/10/clip_image00479.jpg 4/12/image44.png References:
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