EFFECT OF LEAD EXCESS IN SOIL ON THE ACCUMULATION OF P, K AND Na IN INFECTED BY FUSARIUM OXYSPORUM F. SP. RADICIS-LYCOPERSICI IN TOMATO (LYCOPERSICON ESCULENTUM MILL.) PLANTS

T. Vatchev, E. Miteva, S. Maneva

Abstract: Pot experiments were conducted in greenhouse of IPAZR, “N. Poushkarov”, Sofia, to study the effects of excess lead (Pb) in soils on the uptake of P, K and Na in tomato plants (Lycopersicon esculentum Mill.), cv. Ideal, grown in Fusarium oxysporum f. sp. radicis-lycopersici (FORl) infected soils. Lead at the rate of 0, 80 and 160 mg kg-1 soil were added in soil in solution form as lead nitrate [Pb(NO3)2]. The results showed that only the highest of applied doses of lead in soil leads to increase of P, K and Na in both the roots and the stems. Significant changes in the concentrations of the studied elements in plants caused FORL infection, as the increase was greatest for Na (P<0.001, 58% over the in the control stems). The combination of both stress factors had significant effect on P and Na uptake. It doubled the content of K in roots (60889 mg.kg-1) compare to control, which is out of the tolerance limit for tomato plants. The total amount of P, K and Na in plants increased with the increasing of DS of FORL infection. In case of Na this increase was due to increase of the Na content in roots while at P increased concentration in the stem. Positive correlations were found between soil Pb content and concentrations of P, K and Na in both stem and roots except the P in stems. FORL infection inverted this trend except for P in both part of the tomato plants.

Keywords: accumulation; Fusarium oxysporum f. sp. Lycopersici; lead; macronutrients; soil born pathogen; soil contamination

Date published: 2019-01-28