TY  - JOUR
AU  - Kaznina, N. M.
AU  - Titov, A. F.
T1  - Effect of Zinc Deficiency and Excess on the Growth and Photosynthesis of Winter Wheat
JO  - Journal of Stress Physiology & Biochemistry
Y1  - 2017
VL  - 13
IS  - 4
SP  - 88
EP  - 94
UR  - http://www.jspb.ru/issues/2017/N4/JSPB_2017_4_88-94.pdf

KW  - Triticum aestivum L.
KW  - zinc stress
KW  - growth
KW  - photosynthesis

U1  - 1997-0838




N2  - Zinc is one of the necessary micronutrients for plants, which performs a number of various functions in their cells. Therefore, the deficiency of this element negatively affects on plants and leads to a significant decrease of their productivity. On the other hand, zinc in high concentrations is toxic to plants, and its accumulation in aerial organs, especially in cereals, represent a real danger to human and animal health. In this investigation the effect of the deficiency (Zn 0 μM) and the excess of zinc (Zn 1000 μM) on the growth and photosynthesis of the winter wheat (cv. Mironovskaya 39) was studied. As a result, similarities and differences in the response of plants to these two types of stress were revealed. In particular, both with a lack and with an excess of metal in the nutrient solution, shoot growth and photosynthesis rate are inhibited  which leads to a decrease in the accumulation of dry biomass. Excess of metal, in contrast to its deficiency, leads to inhibition of root growth, and also a negative impact on pigment content, including light-harvesting complexes, and on maximum quantum yield of PS II. It is assumed that these changes in the photosynthetic apparatus are the main causes of a decrease of photosynthesis rate in plants under these conditions, whereas in the case of zinc deficiency, an inhibition of the process intensity is most likely due to a change in the activity of zinc-containing enzymes involved in the dark reactions of photosynthesis.
ER  -