biologia plantarum

International journal on Plant Life established by Bohumil Nìmec in 1959

Biologia plantarum 46:91-97, 2003 | DOI: 10.1023/A:1027389100479

Growth and Differentiation of Root Endodermis in Primula acaulis Jacq.

A. Lux1, M. Luxová2
1 Department of Plant Physiology, Faculty of Natural Sciences, Comenius University Bratislava, Bratislava, Slovak Republic
2 Institute of Botany, Slovak Academy of Sciences, Bratislava, Slovak Republic

Adventitious roots of Primula acaulis Jacq. are characterized by broad cortex and narrow stele during the primary development. Secondary thickening of roots occurs through limited cambial growth together with secondary dilatation growth of the persisting cortex. Close to the root tip, at a distance of ca. 4 mm from the apex, Casparian bands (state I of endodermal development) within endodermal cells develop synchronously. During late, asynchronous deposition of suberin lamellae (state II of endodermal development), a positional effect is clearly expressed - suberization starts in the cells opposite to the phloem sectors of the vascular cylinder at a distance of 30 - 40 mm from the root tip. The formation of secondary walls in endodermis (state III of endodermal development) correlates with the beginning of secondary growth of the root at a distance of ca. 60 mm. Endodermis is the only cortical layer of primrose, where not only cell enlargement but also renewed cell division participate in the secondary dilatation growth. The original endodermal cells additionally divide anticlinally only once. Newly-formed radial walls acquire a typical endodermal character by forming Casparian bands and deposition of suberin lamellae. A network of endodermal Casparian bands of equal density develops during the root thickening by the tangential expansion of cells and by the formation of new radial walls with characteristic wall modifications. These data are important since little attention has been paid up till now to the density of endodermal network as a generally significant structural and functional trait of the root.

Keywords: Casparian bands; cell division; density of endodermal network; primary growth and differentiation; secondary dilatation growth
Subjects: Casparian bands; cell division, root endodermis; density of endodermal network; endodermis; growth, secondary dilatation; Primula acaulis; root differentiation, endodermis

Published: July 1, 2003  Show citation

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Lux, A., & Luxová, M. (2003). Growth and Differentiation of Root Endodermis in Primula acaulis Jacq. Biologia plantarum, 46(1), 91-97. doi: 10.1023/A:1027389100479
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