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Observations on the Root Anatomy of Rice (Oryza sativa L.)

Lisa H. Clark and William H. Harris
American Journal of Botany
Vol. 68, No. 2 (Feb., 1981), pp. 154-161
Stable URL: http://www.jstor.org/stable/2442846
Page Count: 8
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Observations on the Root Anatomy of Rice (Oryza sativa L.)
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Abstract

Rice plants were grown hydroponically and roots were prepared for light and electron microscopy using standard techniques. The roots are bounded by an epidermis, exodermis, and fibrous layer. The exodermis has a suberin lamella along its inner tangential wall. The fibrous layer is composed of thick-walled lignified cells with little pitting. The cortical parenchyma is compact when young, but expands and separates to form a zone of cell walls and air spaces in a spoked arrangement. Supporting columns of living parenchyma cells are occasionally present, particularly near lateral roots. The endodermis is typical for grasses with Casparian strips, suberin lamellae, and tertiary state walls with numerous pits. The pericycle and pith become sclerified. Protoxylem elements alternate with protophloem in the young root; later, early metaxylem, late metaxylem, and metaphloem proliferate. The exodermis, fibrous layer, lacunate cortex, and endodermis appear to present a formidable barrier to radial ion movement in the mature portions of the root.

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