Intraspecific variability of Sedobassia sedoides plants with intermediate C3-C4 type of photosynthesis under osmotic stress conditions
M. Yu. PROKOFIEVA, E. V. SHUYSKAYA, Z. F. RAKHMANKULOVA
К. А. Timiryazev Institute of Plant Physiology RAS, 127276, Moscow, Botanicheskaya str., 35
Keywords: Sedobassia sedoides, population variability, osmotic stress, C3-C4 photosynthesis
Abstract
The effect of PEG‑induced drought on the growth, the efficiency of photosystems I and II, and the
accumulation of proline, sodium and potassium ions in plant shoots of two populations of the intermediate
C3-C4 xerohalophyte Sedobassia sedoides was studied. The heterogeneity of plant response to osmotic stress
was revealed, both between populations and within each of them. The relationshi ps between the factors involved
in the adaptive mechanisms of plants from different populations under osmotic stress was determined.
Presumably, the intraspecific variability of S. sedoides plants in the mechanisms of drought tolerance is
associated with the different expression of the C4 photosynthetic syndrome in different populations and soil
conditions, in particular, with the water-salt balance of soil.
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