Some photosynthetic characteristics and chemical composition of Karwinskiaparvifolia leaves

Net photosynthetic rate and chemical composition of the Karwinskia parvifol ia Rose leaves were estimated. On the basis of the CO2 curves of photosynth esis the values of PN increased in response to the increasing CO2 Concentra tion and irradiance. Higher temperature did not significantly influence the rate of photosynthesis. Chemical composition of the leaves was different: the level of starch and the content of reducing sugars were higher in the p lants cultivated under summer temperature regime (35/20 degreesC), however, content of the N and C was higher in the plants cultivated under winter te mperature regime (20/5 degreesC). Our study also provides the values of the other characteristics: dark respiration rate, chlorophyll concentration, s tomata characteristics and specific leaf area. It was confirmed that higher temperature in SR significantly influenced stomata apparatus properties su ch as stomata density, stomata length and width.