Variation in stem anatomy of rice cultivars
2000
Sarwar, A.K.M.G. | Prodhan, A.K.M.A.,Bangladesh Agricultural Univ.,Mymensingh (Bangladesh). Dept. of Crop Botany
Anatomical investigations on 8 cultivars of rice (Oryza sativa L.), four fromeach of the traditional (local) and modem (high yielding) cultivars, were carriedout to study the variation among the cultivars: The epidermis is single layeredhaving cuticle of varying thickness. The number of hypodermal layer is more inmodem cultivars compared to traditional ones. The vascular bundles are of twotypes, outer (small) and inner (large), in all the cultivars except Madhabshail-boro where additional median (medium) type is present in between outer andinner bundles. The number, position and arrangement of vascular bundles varyamong the cultivars. The outer vascular bundles are embedded in the hypodermisand found to push outwards forming outgrowth of different shapes in all thecultivars except BR7 and BR3 where the wavy appearance in outer circumferenceof the stem, is present. Some of the inner vascular bundles are attached ornearer to the hypodermis while the rest are away from it. The hollow pith isfound to be smaller in modem cultivars compared to traditional ones. The highernumber of mechanical tissues (hypodermal cells and inner vascular bundles) inmodern cultivars imparts resistance to lodging.
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