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'Epicuticular Wax Composition' in keywords Facet   Publication Year 1992  [X]
Facet   section ZfN Section C  [X]
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1Author    P.-G Gülz, E. MüllerRequires cookie*
 Title    Seasonal Variation in the Composition of Epicuticular Waxes of Quevcus robur Leaves  
 Abstract    The epicuticular leaf waxes of Quercus robur were analyzed continuously over a two years vegetation period with preparation every week from April to November. The folded leaflets in buds have waxes quite different in yield and composition from those of mature leaves. They contain homologous series of hydrocarbons, wax esters, primary alco­ hols, fatty acids and triterpenoids from the beginning, but not aldehydes. After leaf unfolding a dynamic biosynthesis of alcohols, aldehydes and fatty acids is observed in May and June. Wax content is doubled per dry weight or in cm2 leaf surface area and 80-fold per one leaf in that time. During leaf development tetracosanol becomes the dominant epicuticular wax component comprising ca. 40% of the wax. In both years of the study a reactivation of wax ester biosynthesis is observed in October and November. Esters with chain length C36 and C38 increased particularly. From July to November the wax composition remained nearly constant within mean values and their stand­ ard deviations. Within the two years studied most values concerning wax composition are reproducible and are therefore genetically determined. In spring the growing processes are influenced by climatic factors. 
  Reference    Z. Naturforsch. 47c, 800—806 (1992); received June 9 1992 
  Published    1992 
  Keywords    Quercus robur, Fagaceae, Leaves, Epicuticular Wax Composition, Seasonal Variation 
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 TEI-XML for    default:Reihe_C/47/ZNC-1992-47c-0800.pdf 
 Identifier    ZNC-1992-47c-0800 
 Volume    47 
2Author    P.-GG. Ülz, E. M. Üller, T. H. Errm AnRequires cookie*
 Title    Chemical Composition and Surface Structures of Epicuticular Leaf Waxes from Castanea sativa and Aesculus hippocastanum  
 Abstract    Epicuticular leaf waxes of Castanea sativa and Aesculus hippocastanum contain the same lipids in form of homologous series o f hydrocarbons, wax esters, aldehydes, primary alcohols and fatty acids in similar concentrations without any main component dominating. In Ae. hip­ pocastanum wax acetates are present, additionally. Both waxes are found to contain triter-penols and triterpenol esters in remarkable amounts. ß-Amyrin, a-amyrin and lupeol are pres­ ent in both plant waxes, in Ae. hippocastanum wax friedelanol and friedelanone, additionally. The epidermis o f both plants are covered with a thin continuous wax layer without crystal­ loids. But the adaxial leaf surface o f C. sativa shows granular wax sculptures and therefore a different micromorphological ultrastructure for both leaf sides. 
  Reference    Z. Naturforsch. 47c, 661—666 (1992); received March 12/May 20 1992 
  Published    1992 
  Keywords    Castanea sativa, Aesculus hippocastanum, Leaves, Epicuticular Wax Composition, Surface Structures, Scanning Electron Microscopy 
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 TEI-XML for    default:Reihe_C/47/ZNC-1992-47c-0661.pdf 
 Identifier    ZNC-1992-47c-0661 
 Volume    47