PHYSIOLOGICAL PARTICULARITIES OF THE SPECIES VISCUM ALBUM L. ssp.album AND LORANTHUS EUROPAEUS Jack, HEMI-PARASITES ON LIGNUOUS SPECIES FROM THE COMANESTI FOREST, ROMANIA

Buse-Dragomir Luminita, Nicolae Ion

Abstract


      In the study which had been carried out in the Comanesti forest from the Mehedinti County, Romania, there have been taken into consideration two hemi-parasitic species frequently found in this area: Viscum album, a parasite found on Acer campestre, and Loranthus eurpaeus, a parasite found on Quercus cerris.

    During the summer time, the two hemi-parasitic species which have been takes under study show moderate values for the photosynthesis and transpiration, but increased values in the case of leaf respiration.

   The leaf suction force presents high values, these ensuring both the absorption and the conduction of brute sap.

   The chlorophyll pigment contents indicate higher values in the case of Loranthus, when compared with the other species, Viscum, in the same lighting conditions.

    In Viscum album, the water content shows a seasonal variation, with a maximum during the spring time, after the appearance of leaves on the host plants.      

    In the case of Loranthus, the maximum water content is recorded in early June.


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