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Articles by A.K.M. Azad-ud-doula Prodhan
Total Records ( 3 ) for A.K.M. Azad-ud-doula Prodhan
  Shahanara Begum , Md. Azharul Islam and A.K.M. Azad-ud-doula Prodhan
  Anatomical investigation has been made on the stem of pigeonpea (Cajanas cajan (L.) Millsp.) at different stages of growth following the standard paraffin method of microtechnique. The vascular bundle of the stem are collateral and arranged in a ring. The cambium initiates in the primary vascular bundle between xylem and phloem at the basal part of the stem of 3 days old plant. After the formation of fascicular cambium it gives rise to secondary xylem adaxially and secondary phloem abaxially. Most of the vessel members are solitary and few are paired while others are multiple. The solitary vessel members are more in mature stem as compared to that of the younger stem. The well developed periderm was found in mature stem. The pith resembles a typical dicotyledonous stem.
  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.
  A.K.M. Azad-ud-doula Prodhan , M.L. Rahman and M.A. Haque
  The plant height was studied in Corchorus capsularis (cultivars D-154 and CVL-1) and Corchorus olitorius (cultivars O-4 and R-26) grown under various water regimes. The cultivars were grown under constant drought, constant saturation, alternate saturation and drought and different levels of standing water (5 cm, 10 cm, 20 cm and 30 cm) conditions. The cultivar O-4 had been found to be tolerant to drought but susceptible to waterlogging condition, particularly at the young stage. On the tolerance of submersion, the test cultivars could be placed as D-154 > CVL-1 > R-26 > O-4. The plants of CVL-1 became shorter than that of the O-4 in constant drought. On the contrary, the plants of O-4 and R-26 became shorter than that of the CVL-1 and D-154 in standing water conditions. The plants of O-4 and R-26 died earlier when they were exposed to standing water condition in young stage compared to those of the CVL-1 and D-154. It appears that the plant height is highly affected by constant drought in case of Corchorus capsularis and by standing water in case of Corchorus olitorius. The stressed plants of all the cultivars are shorter than their corresponding control plants.
 
 
 
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