Effect of nitrogen concentrations and Fusarium oxysporum inoculation on barley growth under different Cd levels. (August 2019)

• Record Type: Journal Article
• Authors: Mostafa, A.Z.; Abd el Aziz, O.A.; Moursy, A.A.; Lotfy, S.M.; Ismail, M.M.
• Is Part Of: Applied geochemistry. Volume 107(2019)
• Page Start: 1
• Page End: 7
• Publication Date: 2019-08
• Subjects: Barley -- Cd-spiked soil Fusarium oxysporium fungi -- 15N tracer technique; Environmental geochemistry -- Periodicals; Water chemistry -- Periodicals; Geochemistry -- Social aspects -- Periodicals; Geochemistry -- Periodicals; 551.9
• DOI: 10.1016/j.apgeochem.2019.04.019
• Languages: English
• ISSNs: 0883-2927

Abstract

Abstract: Nitrogen fertilization plays an essential role in plant-defense reactions against various stresses. However, its role in developing a plant's heavy-metal stress reaction in the presence of fungal inoculation is still not well understood. Therefore, a greenhouse pot experiment of barley plants was carried out to trace the impact of different concentrations of nitrogen (60 and 90 mg kg −1 ) and inoculation with Fusarium oxysporium on the nitrogen uptake and the yield/plant, which were affected by various cadmium levels in the soil using the 15 N tracer technique. The dry weight increased significantly with increasing N concentrations and cadmium concentrations in the spiked soil, especially for fungal inoculated plants compared to than uninoculated plants. The highest N uptake was detected in the shoots and grains of fungal inoculated plants with different nitrogen levels. The cadmium content in grains tended to decrease with fungal inoculation. This holds true for all nitrogen and cadmium interactions compared to the uninoculated plants. On the other hand, cadmium detention was recorded in the roots of fungal inoculated plants that were fertilized with highest N-concentrations. The highest percentage of nitrogen in grains derived from fertilizer (Ndff%) was 24.45 and 23.30% in the pots with 90 mg N/kg soil + 10 mg Cd/kg soil + Fungi and 90 mg N/kg soil + 20 mg Cd/kg soil + Fungi, respectively, while the nitrogen use efficiency (NUE%) of the grains in the these pots were recorded as 4.3% and 4.2%, respectively. Highlights: Barley production significantly increased with increasing of N and Cd concentration. Detention of Cd detected with fungal inoculations and high rates of N in roots. Highest N uptake detected with shoot and grains treated with N and fungal inoculation. Positive role N and fungal amendments was observed at lowest Cd contents in grains.