EFFECT OF AMINO ACID OF TRYPTOPHAN ON SOME PHYSIOLOGICAL CHARACTERISTICS OF SAFFRON PLANT (CROCUS SATIVUS L.(

Abstract

The study was carried out in the Lath house , Department of Horticulture and Landscaping / University of Kirkuk / Agricultural Research Station / Al Sayada, for the period from September 15/9/2021 to April 20/4/2022, for the purpose of studying the effect of soaking the corms with the amino acid tryptophan at concentrations (0,150,300) mg. L-1 before planting for 24 hours affected the growth, flowering and yield of the corms of saffron plant (Crocus sativus L)., obtained Saffron corms from the Islamic Republic of Iran, and the bulbs were extracted after two weeks of complete drying of the vegetation After seven months of cultivation, on 4/20/2022, the factorial experiment was designed according to the R.C.B.D Randomized Completely Block Design, the results were analyzed according to the statistical program SAS, 2004 ,The Statistical Analysis, and Duncan's Multiple Range Test was used to compare averages at the level of probability 5%.Soaking the corms with a concentration of 150 mg.L-1 of the amino acid tryptophan before planting had a significant increase in the average number of leaves in the first stage( 14.60 leaves. Plant1 ), the longest leaf for both stages (18.31 and 38.88) cm, number of corms and their wet weight (3.45 corm, 19.08 g), respectively. The highest average number of leaves after flowering is 28.66 leaves. Plant-1 , the number of flowers is 1.5 flowers. Plant-1 , and the dry weight of the stigmas is (0.082) g. As for the soaking at a concentration of 300 mg.L-1 , the highest rate of the number of branches was (4.74 and 5.62) bud.plant-1 for both stages, respectively, the number of leaves after flowering was 28.66 leaves.plant-1 and the number of flowers 1.5 flower.plant-1 and The dry weight of the stigmas was 0.082 g, while the control plants (soaking with water only) had the lowest average number of branchess (3.60 and 5.08) bud.plant-1 for both stages.