Abstract
Lettuce plants were grown in the foil tunnel in pots filled with peat substrate. The experimental factors were: concentration of phosphorus in the substrate (70 or 140 mg dm-3), inoculation of substrate with arbuscular mycorrhizal fungi (+AMF or –AMF) and concentration of selenium in the substrate (0, 6 or 12 mg dm-3). Mycorrhizal frequency in roots was affected by concentration of P, inoculation with AMF and interaction between these factors. Higher mycorrhizal frequency was found in plants inoculated with AMF and grown under conditions of lower P concentration. AMF did not affect an accumulation of Se in leaves. However, higher concentration of P and Se in the substrate affected Se concentration in leaves. The average yield of lettuce decreased with increasing level of Se in the substrate. The presence of Se in the substrate led to decrease of K, Mg, Fe, Cu and Mn content of plants. AMF did not have an effect on the content of sugars in leaves.
Highlights
Arbuscular mycorrhizal fungi (AMF) live in symbiosis with more than 80% of plant species
The development of mycorrhizal structures is affected by environmental conditions, i.e., content of nutrients in the plant root zone, especially P, as well as the pH, temperature, soil moisture or light intensity (Gryndler et al 2006, Cordeiro Silva et al 2014)
The experiment was conducted in three-factor system and the experimental factors were as follows: inoculation of plant roots with arbuscular mycorrhizal fungi (AMF) or lack of it (+AMF/–AMF), content of P in the substrate (140 mg dm-3, the optimal level, or 70 mg dm-3) and content of Se (0, 6 or 12 mg dm3)
Summary
Arbuscular mycorrhizal fungi (AMF) live in symbiosis with more than 80% of plant species. The development of mycorrhizal structures is affected by environmental conditions, i.e., content of nutrients in the plant root zone, especially P, as well as the pH, temperature, soil moisture or light intensity (Gryndler et al 2006, Cordeiro Silva et al 2014). Phosphorus concentration in the plant root zone is the main factor affecting development of AMF structure (Schmidt et al 2010, Cordeiro Silva et al 2014). Amijee et al (1989) observed a significant reduction in colonized roots of leeks under conditions of increased P concentration in soil Phosphorus concentration in the plant root zone is the main factor affecting development of AMF structure (Schmidt et al 2010, Cordeiro Silva et al 2014). Schmidt et al (2010) studied the cultivation of marigolds in perlite inoculated by three species of AMF and demonstrated significant inhibition of mycorrhiza development in roots of plants receiving Hoagland’s solution with optimal and doubled concentration of P, compared to plants receiving Hoagland’s solution in which the concentration of this macronutrient was decreased by 50 or 75%. Amijee et al (1989) observed a significant reduction in colonized roots of leeks under conditions of increased P concentration in soil
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