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Asian Journal of Plant Sciences
  Year: 2005 | Volume: 4 | Issue: 3 | Page No.: 323-333
DOI: 10.3923/ajps.2005.323.333
Anatomy of the Hypocotyl of Country Bean
M. Touhidul Islam, A.K.M. Azad-ud-doula Prodhan , S.M. Abdul Bari and A.K.M. Golam Sarwar

Abstract:
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.
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How to cite this article:

M. Touhidul Islam, A.K.M. Azad-ud-doula Prodhan , S.M. Abdul Bari and A.K.M. Golam Sarwar , 2005. Anatomy of the Hypocotyl of Country Bean. Asian Journal of Plant Sciences, 4: 323-333.

DOI: 10.3923/ajps.2005.323.333

URL: http://scialert.net/abstract/?doi=ajps.2005.323.333

 
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