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Articles by S.M. Abdul Bari
Total Records ( 4 ) for S.M. Abdul Bari
  M. Touhidul Islam , A.K.M. Azad-ud-doula Prodhan , S.M. Abdul Bari and A.K.M. Golam Sarwar
  Anatomical investigation has been made on the hypocotyl of country bean (Lablab purpureus (L.) Sweet) at different stages of growth following the standard paraffin method of microtechnique. The basal part of the hypocotyl is root-like in structure while the middle and upper parts are stem-like. The transition of vascular tissues occurs in the basal part of the hypocotyl. The vascular bundles are collateral in arrangement in the middle and upper parts and radial in the basal part. There are two types of vascular bundles, small and large in the middle and upper parts. There are 1-2 small vascular bundles in between two large bundles. The large vascular bundle contains xylem and phloem but small bundle may or may not contain both xylem and phloem. There are several poles of primary phloem outside the primary xylem. In the basal part of the hypocotyl there are 4 strands of xylem alternating with phloem zones. Each xylem strand is divided into 2 xylem poles which are either connected or separated. There are several poles of phloem in the phloem region in between 2 xylem strands. The vessels in the xylem strands are found to be radially arranged as seen in the basal part of the hypocotyl. Lots of tanniniferous cells with or without content have been found in the primary phloem region. The pericycle is discontinuous. Two adjacent groups of sclerenchyma are connected by one or two layers of sclerenchyma cells. Sometimes 1-2 vascular bundles, either large or small, contain a single band of sclerenchyma on their abaxial sides. The cambium appears and becomes active in the fascicular region earlier than the interfascicular region. The cambium appears in the basal part of the hypocotyl of 4 days old seedling. Gradually it extends towards the upper part. The cambium forms a ring in the basal part of the hypocotyl of 7 days old seedling. The epidermis, cortex and pith resemble a typical dicotyledonous plant. The phellogen appears in the cortex and gives rise to cork and phelloderm. A well developed periderm is formed in the hypocotyl of mature plant.
  A.K.M. Azad-ud-doula Prodhan and S.M. Abdul Bari
  Anatomical investigation has been made on the root of lignosus bean (Dipogon lignosus (L.) Verdc.) at different stages of growth following the standard paraffin method of micro technique. The primary root is tetrarch with 4 strands each of xylem and phloem that alternate with one another. Metaxylem and metaphloem follow protoxylem and protophloem respectively in their courses of differentiation. The four opposite strands of primary xylem meet at the center. Subsequently, metaxylem forms near the center on either side of the xylem strands. The epidermis is single layered with large number of root hair and glandular trichomes. There are 6-12 layers of cortical cells beneath the epidermis. The adaxial layers (radially 4-6 cells) of the cortex around the stele are hyperchromatic in nature. The hyperchromaticity is higher in the cells abaxial to xylem poles. The cambium appears in the upper part of the root and extends towards the root apex. The sclerenchymatous band abaxial to phloem is discontinuous. The vessels are more or less round, oval or polygonal in shape with prominent secondary thickening. The phellogen appears in the cortex, 3-4 layers beneath the epidermis. It produces 3-5 layers of cork cells abaxially and 2-3 layers of phelloderm adaxially.
  S.M. Abdul Bari and A.K.M. Azad-ud-doula
  Anatomical investigation has been made on the hypocotyl of lignosus bean (Dipogon lignosus (L.) Verde.) at different stages of growth. The hypocotyl is like stem in structure. The epidermis is single layered with large and small cells. Beneath the epidermis there are 9-12 layers of cortical cells. The vascular bundles are collateral and arranged in a ring. There are two types of vascular bundles, large and small. Lots of tanniniferous cells have been found in the cortex and primary phloem region of the younger hypocotyl but not in older ones. Adaxial to the epidermis there are 5-7 layers of lacunar collenchyma at the younger hypocotyl. Along with the age the lacunar collenchyma cells have been replaced by the parenchyma cells. The cambium initiates in the primary vascular bundles between xylem and phloem at the basal part of hypocotyl of 3 days old seedlings. The cambium is at first confined to the fascicular region. Subsequently it extends into the interfascicular region and forms a complete cambial ring. The sclerenchymatous band known as pericycle is discontinuous. Two adjacent groups of sclerenchyma are connected by one or two layers of sclerenchyma cells. Sometimes 3-4 vascular bundles, either large or small, contain a single band of sclerenchymatous cells on their abaxial sides. The phellogen appears in the cortex and gives rise to 4-6 layers of cork cells abaxially and 2-4 layers of phelloderm adaxially.
  M. Touhidul Islam , A.K.M. Azad-ud-doula Prodhan , S.M. Abdul Bari and M. Obaidul Islam
  Anatomical investigation has been made on the stem of country bean (Lablab purpureus (L.) Sweet) at different stages of growth following the standard paraffin method of microtechnique. The epidermis is single layered with multicellular hairs and glandular trichomes. Beneath the epidermis there are 5-10 layers of cortical cells. The primary vascular tissue appears after the elongation of the first internode of the stem. The vascular bundles are collateral and arranged in a ring. There are two types of vascular bundles, large and small. There are one or more small vascular bundles in between two large bundles. The large vascular bundle contains xylem and phloem but small bundle may or may not contain both xylem and phloem. There are several poles of primary phloem outside the primary xylem. The pericycle is discontinuous. Two adjacent groups of sclerenchyma are connected by one or two layers of sclerenchymatous cells. The cambium initiates in the primary vascular bundle between xylem and phloem at the basal part of the stem of 4 days old plant. Gradually it extends towards the upper part. The cambium is at first confined to the fascicular region. Subsequently it extends into the interfascicular region forming a complete cambial ring. After the formation of the fascicular cambium it gives rise to the secondary xylem adaxially and secondary phloem abaxially. In the mature stem, most of the vessels are multiple, some are paired while the others are solitary. Most of the fibre cells in the phloem region are found in groups. The fibre cells are arranged in such a way that the structure looks like a pyramid. Tannin cells are present in the phloem region of younger and mature stem. The secretory cells devoid of tanniniferous contents have been observed in the secondary phloem region of the mature stem. The phellogen appears in the deeper cortex and produces periderm with lenticel. The periderm consists of 3-5 layers of cork cells abaxially and 2-3 layers of phelloderm adaxially.
 
 
 
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