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Updated: 09-12-10

AN ELICITOR  ISOLATED  FROM  SMUT  TELIOSPORES (SPORISORIUM SCITAMINEUM) ENHANCES LIGNIN DEPOSITION ON THE CELL WALL OF BOTH  SCLERENCHYMA AND XYLEM IN SUGARCANE LEAVES

ROCÍO SANTIAGO, JULIA QUINTANA, SUSANA RODRÍGUEZ, EVA MARÍA DÍAZ, MARIA ESTRELLA LEGAZ AND CARLOS VICENTE^*

Abstract: Sugarcane leaf shows the classical arrangement of cells which defines a C4 species. Vascular bundles consist of xylem, phloem and fibres, surrounded by an outer layer of sclereids and an inner ring of stone cells associated with the phloem. Some sclereids located below and above the vascular bundles act as docking cells and connect the vascular bundle to the internal surfaces of upper and lower layers of the epidermis. A compact mass of sclereids occupies the total internal volume of the leaf edge. Neither docking cells nor the internal mass of sclereids in the edge were markedly coloured by acriflavin or phloroglucinol, indicating the absence of lignin in their cell walls. However, such staining indicated that fibres of the vascular bundle and the external layer of sclereids were strongly lignified. Incubation of leaf discs with an elicitor produced by the pathogen Sporisorium scitamineum increased the thickness of the lignified cell walls of sclereids as well as the mid and small xylem vessels, as a possible mechanical defense response to the potential entry of the pathogen.
 

Department of Plant Physiology, Faculty of Biology, Complutense University. 2, José Antonio Novais Av., 28040 Madrid, Spain.

^*Correspondence author E-mal: cvicente@bio.ucm.es; Phone number: 34-1-3944565; Fax number: 34-1-3945034 

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