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Auch subepidermale Zellen knnen zum Gewebe der Ligula beitragen. Diese Teilungsttigkeit kann am Scheitel der Scheide zur Ausbildung einer Ligula fhren in diesen Fllen kennzeichnet die Ligula die obere Grenze des Unterblattes. Die primre Spitze eines Blattprimordiums wird zum Scheitel des Unterblattes.īei einigen Formen beteiligt sich die Epidermis an der Gestaltung des Unterblattrandes und seiner Spitze durch Aufteilung in perikliner Richtung. beiAllium lineare, kann die Abflachung in der Transversalebene erfolgen. Bei den Schwertblttern ist die unifaziale Lamina in der Mediane abgeflacht, in anderen Fllen, z. globulus leaves would assist in water conservation, particularly at high solar angles.ĭie unifaziale Blattspreite vonAllium Cepa, Allium fistulosum Allium Schoenoprasum, Allium lineare, Juncus glaucus, Sanseviera cylindrica undOrnithogalum caudatum entsteht ebenso wie die Vorluferspitze als sekundrer, abaxialer Auswuchs der Blattanlage. Reduced light interception and leaf temperature of vertical adult E.
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Greater light interception by the sub-horizontal juvenile leaves would confer a growth advantage to saplings and regenerating canopies. Stomatal conductance was variable during the period of measurement but was similar for the Tasmanian juvenile (0.4 to 0.9 cm s(-1)) leaves and Wilsons Promontory adult (0.5 to 1.2 cm s(-1)) leaves. The amphistomatal and isobilateral adult leaves intercepted sunlight equally on both leaf surfaces. Sub-horizontal juvenile leaves intercepted 22% more irradiance than vertical adult leaves during the middle of the day. Both leaf types intercepted a greater irradiance during the morning than at midday. Mid-vein and blade angles of juvenile and adult leaves were non-random with an overall vertical declination of the leaves.
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In contrast, an early-maturing sapling of the same age from Wilsons Promontory, Victoria had a predominance of adult leaf blades facing east and west. Juvenile leaves of a late-maturing sapling of a Tasmanian provenance were evenly distributed in all azimuth sectors. globulus did not show active diurnal orientation toward or away from incident radiation. Juvenile and adult leaves of the heteroblastic species Eucalyptus globulus Labill.