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Anatomy of Lignosus Bean (Dipogon lignosus) II: Hypocotyl

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Author(s): S.M. Abdul Bari | A.K.M. Azad-ud-doula

Journal: Pakistan Journal of Biological Sciences
ISSN 1028-8880

Volume: 4;
Issue: 9;
Start page: 1057;
Date: 2001;
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Keywords: Lignosus bean | dipogon lignosus | anatomy | hypocotyl

ABSTRACT
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 Along with the age the lacunar collenchyma cells have been replaced by the parenchyma cells.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
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