Effects of L-Phenylalanine or L-Tyrosine Foliar Application on Growth Characteristics, Yield, and Essential Oil of Spearmint

Articles in Press

Document Type : Full Paper

Authors

1 Department of Horticultural Sciences, Faculty of Agricultural Engineering, University of Tarbiat modares, Tehran

2 Department of Horticultural Sciences, Faculty of Agricultural Engineering, University of Tarbiat modares, Tehran, Iran.

Abstract

This research was aimed at foliar applying two amino acids including L-phenylalanine and L-tyrosine with different concentrations (0, 250, 500, 750, and 1000 ppm) to improve growth parameters, essential oil, and total content of phenolic compounds of spearmint. For this purpose, two split-plot experiments were conducted based on completely randomized (9 treatments with 3 replications; 2 harvests; under greenhouse conditions) and randomized complete block (9 treatments with 3 replications; 2 harvests; under farm conditions) designs in the agricultural college of Tarbiat Modares University (Tehran, Iran). Morphological and biochemical traits were evaluated in the harvested plants at 50% flowering stage. The results showed that L-phenylalanine and L-tyrosine had significant effects on the growth and biochemical characteristics of the plant. The treatments including L-phenylalanine 250 ppm in the first greenhouse harvest, L-phenylalanine 1000 ppm in the second greenhouse harvest, L-phenylalanine 500 and L-tyrosine 500 ppm in the first farm harvest, and L-phenylalanine 750 ppm in the second farm harvest had the most significant effects on all studied traits. The highest carvone (72.4%) and limonene (29.3%) amounts were observed in the L-phenylalanine 1000 and 250 ppm treatments, respectively in the second greenhouse harvest. In general, L-phenylalanine 1000 ppm in the greenhouse harvests and L-phenylalanine 500 ppm in the farm harvests had the best results. Considering that the application of growth stimulants is consistent with sustainable agriculture and also had a positive effect on the results in the present research, their use could be recommended.

Keywords

Main Subjects

Iranian Journal of Horticultural Science

Articles in Press, Accepted Manuscript
Available Online from 28 December 2024

Files

History

  • Receive Date: 19 January 2024
  • Revise Date: 21 December 2024
  • Accept Date: 28 December 2024

Share

How to cite

Statistics