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VARIATION IN STEM ANATOMY OF RICE CULTIVARS
A.K.M. GOLAM SARWAR AND A.K.M. AZAD-UD-DOULA PRODHAN
Abstract: Anatomical investigations on 8 cultivars of rice
(Oryza sativa L.), four from each of the traditional (local)
and modem (high yielding) cultivars, were carried out to study the variation
among the cultivars. The epidermis is single layered having cuticle
of varying thickness. The number of hypodermal layer is more in modem
cultivars compared to traditional ones. The vascular bundles are of
two types, outer (small) and inner (large), in all the cultivars except
Madhabshail-boro where additional median (medium) type is present in
between outer and inner bundles The number, position and arrangement
of vascular bundles vary among the cultivars. The outer vascular bundles
are embedded in the hypodermis and found to push outwards forming outgrowth
of different shapes in all the cultivars except BR7 and BR3 where the
wavy appearance in outer circumference of the stem is present. Some
of the inner vascular bundles are attached or nearer to the 11 hypodermis
while the rest are away from it. The hollow pith is found to be smaller
in modern cultivars compared to traditional ones. The higher number
of mechanical tissues (hypodermal cells and inner vascular bundles)
in modern cultivars imparts resistance to lodging.
Department of Crop Botany, Bangladesh Agricultural University, Mymensingh-2202,
Bangladesh.
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