| Abstrakt: |
Abiotic stress agents, such as heavy metals, can negatively affect growth and plant development. Vitamins can play a very important role in various physiological, metabolic, and enzymatic activities, which can improve plant tolerance and resistance to different types of stress. The aim of the present study was to explore the effect of exogenous application of thiamine (100 µM) and nicotinic acid (100 µM) on lentil plants under the exposure to lead (Pb) (1mM). Results showed that the exposure to Pb induced a reduction in length, biomass of roots and shoots, photosynthetic pigment content, leaf area and mineral nutrition (Zn, Mg, Ca, and K). In addition, under stress conditions lentil plants accumulate more H2O2 (+ 46%), soluble sugars (45%), proteins (26%), proline (168%) and Na with increased catalase and ascorbate peroxidase activity than the control plants. Exogenous application of thiamine and nicotinic acid significantly improves the various morpho-physiological and biochemical parameters previously affected by Pb, and reduces oxidative damage by lowering H2O2 accumulation. In general, thiamine and nicotinic acid application improves length, biomass, leaf area, photosynthetic pigment and mineral nutrition, and reduces H2O2, Na, and Pb accumulation in roots and shoots. It will be very interesting to study the positive impact of these two vitamins in other plants under various stress factors. [ABSTRACT FROM AUTHOR] |
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