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Published in Scientific Papers. Series B, Horticulture, Vol. LXIV, Issue 2
Written by Ruxandra Ileana AELENEI, Monica Luminița BADEA, Ana Cornelia BUTCARU, Liliana BĂDULESCU, Florin TOMA

The paper presents the results of the morphological characteristics of Hosta leaves (leaves area, the perimeter, the length of the leaves, width of leaf, the surface of the dominant colour) and physiological studies (photosynthesis, respiration, transpiration and chlorophyll) got from 'T. Rex’, 'American halo’, 'White feather’ and 'Christmas island’ varieties of Hosta cultivated in "I. Todor" Botanical Garden within the University of Agronomic Sciences and Veterinary Medicine of Bucharest. The intensity assessment of the photosynthesis, respiration and transpiration was determined with the LCPro+ device, directly into the experimental field. The intensity of photosynthesis varied between 2.33 μmol CO2 m-2 s-1 ('American halo’) and 22.08 μmol CO2 m-2 s-1 ('Christmas island’), intensity of transpiration 2.54 mmol H2O m-2 sec-1 ('American halo’) and 6.12 mmol H2O m-2 sec-1 ('Christmas island’), intensity respiration 2.81 μmol CO2 m-2 s-1 ('White feather’) and 6.55 μmol CO2 m-2 s-1 ('Christmas island’). The intensity of physiological processes varied depending on the light intensity, temperature and species. The photosynthetic pigments content was determined using 80% acetone extraction and by spectophotometry at wavelengths of 470 nm, 663 nm and 646 nm.

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