Seed Priming with Exogenous Amino Acids Improves Germination Rates and Enhances Photosynthetic Pigments of Onion Seedlings (Allium cepa L.)

As a biostimulant, amino acids play crucial roles in enhancing plant growth and development. These roles, combined with the ability to be approved for organic usage, make good choice sustainable farming systems. This work investigates effect of onion seed priming different exogenous acids, specifically impact diverse range morpho-physiological responses seedlings. Here, we primed seeds (Cultivar Giza 6) ten acids. Based on parameters seedlings, data showed that glutamine significantly improved most studied parameters. Germination percentage (GP) ranged from 85% Methionine (Met) 98.5% Proline (Pro) Tryptophan (Try), 10% over control treatment. Glutamine (Glu) enhanced vigor index (VI) onion, giving high produce normal The extended root system (?3.3 cm) was obtained Glu, Glycine (Gly), Pro, Try treatments. maximum shoot length treatments (Glu Try) more than 60% control. Priming (AAs) increased chlorophyll contents compared non-primed seeds. Threonine (Thr) had highest results (122 127 ?g/g fresh weight, respectively), while Glu treatment registered Carotene 50% Furthermore, illustrate principal component analysis-1 (PCA1) indicates 67.2% variability, PCA2 14.8% variability. Strong positive correlations were observed between germination percentage, length, dry matter, a, carotene. study concluded by glutamine, proline, tryptophan best rates.