Effect of Phenylalanine and Naphthalene Acetic Acid on Growth, Yield and Antioxidant Activity of Fenugreek Trigonella foenum-graecum

Abstract

Abstract A filed experiment was carried out during autumn at 2017 to assess the effect of phenylalanine (Phe) foliar application at a rate of 0, 100 and 200 mg.L-1, and naphthalene acetic acid (NAA) at 0, 50 and 100 mg.L-1, as well as their interactions on growth parameters, yield components and antioxidant activity as a total phenolics content (TPC), total antioxidant capacity (TAC), ferric reducing antioxidant power (FRAP) and radical scavenging activity (DPPH) of leaves and seeds of fenugreek (Trigonella foenum-graecum L.). Results showed that all parameters increased significantly with increasing Phe, NAA at 50 mg.L-1 had significant effect on all parameters, while NAA at 100 mg.L-1 increased only plant height and antioxidant activity parameters, the interaction Phe200 ×NAA100 gave high values on antioxidant parameters TPC, TAC, FRAP and DPPH reached 166.39, 46.34, 1.298 mg.100g-1 DW and 78.69% respectively for leaves and 64.57, 58.96, 0.504 mg.100g-1 DW and 83.26% respectively for seeds.