Volume 43, Number 5, 200836th annual meeting of the European Radiation Research Society
|Number of page(s)||1|
|Section||Poster Presentation - Radiotoxicology and contamination of Biota|
|Published online||03 September 2008|
Research of the Activity of Chlorophyllase in Plants Growing in the High Radiation Background Zone
Institute of Radiation Problems of ANAS, F. Agayev 9, AZ1143 Baki, Azerbaijan
The research objects have been Alhagi pseudalhagi, Zygophyllum L. and Argusia sibirica L. Choice of the plants is connected to the fact that they are the most widespread ones in the chosen site, ground of which is dirtied by 238U, 232Th, 226Ra and 40K. The work has been aimed on researching impact of the low-dosed ionizing radiation to photosynthesis of plants. The findings show that between concentrations of photosynthetic pigments in experimental and control plants growing in identical soil-climatic conditions there are certain distinctions being sometimes very considerable ones. Besides, in the concrete natural conditions photosynthetic reaction of different species to irradiation proves to be different and for a plant taken separately the reaction has seasonal character. Analysis of the dynamics of green pigments synthesis for Argusia sibirica L. at the first two phases of development has shown that the photosynthesis intensity was practically similar in experimental and control plants. At the same time final phase of the plants development was notable for decrease of the photosynthesis intensity, resulting in the inhibition of speed of the pigments synthesis. For Alhagi pseudalhagi both at the initial, and the final phase of vegetation period there was observed decrease of the chlorophylls synthesis. At the middle phase the ionizing radiation favored increase of pigments concentration in this plant at nearly 30%. The fact of increase of chlorophylls concentration in leaves of the researched plants under impact of radiation can be accepted as stimulation of pigment biosynthesis. Taking into account that biosynthesis of pigments is also specified by activity of chlorophyllase enzyme, we deemed expedient to research change of the enzymes activity. Activity of the enzyme was judged by us from increase of chlorophyllids number in the sample within a certain period of the pigments incubation with the enzyme preparation. It was revealed that for all the researched plants, where is found out biostimulation of the chlorophylls synthesis, activity of the chlorophyllase decreases. We can suppose that decrease of chlorophyllases activity under impact of the ionizing radiation is reason for intensification of chlorophylls synthesis. In other words, it can supposed that the chlorophyllase isnt catalyst of the biosynthesis of the chlorophyll a, but on the contrary, performs at this time some hydrolytic function realizing decay of the chlorophylls molecules.
Key words: low dose radiation / synthesis of chlorophylls / photosynthesis / activity of chlorophyllase
© EDP Sciences, 2008
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