Inducing the growth and flowering of caraway (Carum carvi L.) plant

This study was conducted during the 2019/2020 and 2020/2021 seasons at the Farm of Medicinal and Aromatic Plants Research Department in El-Kanater El-Khairia to evaluate the effect of glycine and tryptophan, each of them alone, at concentrations of 50, 100, and 150 ppm on vegetative growth, fruit yield, oil production, and plant hormones of caraway plants ( Carum carvi L.). The results are summarized as follows: caraway plants showed a positive response to the foliar application by glycine and tryptophan. The plant that received tryptophan at 150 ppm has the highest vegetative growth, denoted as plant height and the number of branches/ plant, and produced the highest number of umbels per plant and fruit yield compared with other treatments in the two seasons. The high concentration of glycine or tryptophan (150 ppm) significantly increased the essential oil percentage compared to the control in both seasons. The application of tryptophan at a concentration of 150 ppm recorded the highest percentage of the main constituent of the essential oil (carvone). Moreover, it also affected some plant hormones such as gibberellin, indole acetic acid, and abscisic acid.