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Annals of Botany 81: 35-39, 1998
© 1998 Annals of Botany Company

Histochemical Localization of Citral Accumulation in Lemongrass Leaves (Cymbopogon citratus(DC.) Stapf., Poaceae)

EFRAIM LEWINSOHN+,, NATIV DUDAI, YAAKOV TADMOR, IRENA KATZIR, UZI RAVID, ELI PUTIEVSKY and DANIEL M. JOEL

Aromatic, Medicinal and Spice Crops Unit, Newe Ya'ar Research Center, Agricultural Research Organization, P.O. Box 1021, Ramat Yishay, 30095, Israel Corn Breeding Unit, Newe Ya'ar Research Center, Agricultural Research Organization, P.O. Box 1021, Ramat Yishay, 30095, Israel Department of Weed Research, Newe Ya'ar Research Center, Agricultural Research Organization, P.O. Box 1021, Ramat Yishay, 30095, Israel

June 2, 1997 ; July 8, 1997 . September 4, 1997 .

Lemongrasses (Cymbopogonspp., Poaceae) are a group of commercially important C4tropical grasses. Their leaves contain up to 1.5% (d.wt) essential oils with a typical lemon-like aroma, consisting mainly of citral (a mixture of the isomeric acyclic monoterpene aldehydes geranial and neral). To specifically locate the sites of citral accumulation in lemongrass we employed Schiff's reagent, which reacts with aldehydes and gives a purple-red coloration with citral. Using this technique, single oil-accumulating cells were detected in the adaxial side of leaf mesophyll, commonly adjacent to non-photosynthetic tissue, and between vascular bundles. Cell walls of these oil cells are lignified. Our results suggest that citral accumulation takes place in individual oil cells within the leaf tissues.Copyright 1998 Annals of Botany Company

Lemongrass;Cymbopogon citratus; Poaceae; oil cells; histochemistry; citral; aldehydes; Schiff's-reagent.


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