A comparative structural and functional study of leaf traits and sap flow in Dracaena cinnabari and Dracaena draco seedlings

摘要: Water relations for two remote populations of Dracaena tree species from the dragon group, cinnabari Balfour f. and draco (L.) L., were studied to test our hypothesis that morphological anatomical differences in leaf structure may lead varied functional responses changing environmental conditions. Sap flow measurements performed using heat field deformation method four seedlings grown one glasshouse greenhouses, traits related plant–water relationships characterised. All confirmed D. leaves are more xeric their morpho-anatomical compared with leaves. No radial sap variability was detected plant stems, whereas found be higher inner part stems. The regular occurrence reverse at night both consistent a staining experiment. Vapour pressure deficit (VPD) main driver transpiration species. However, relationship between VPD appeared different each species, clockwise or no hysteresis loop counter-clockwise cinnabari. This resulted shorter cycle observed superior water-saving strategy corresponds its draco.