Effects of Gamma Amino Butyric Acid (GABA) on Nutrient Uptake of Loquat [Eriobotrya japonica (Thunb.) Lindl.] Seedlings

Gamma amino butyric acid (GABA), an important free in plant tissues, plays essential role all stages of growth and development. In this study, we aimed to explore the effects GABA on nutrient absorption loquat [Eriobotrya japonica (Thunb.) Lindl.] seedlings. The applying exogenous different concentrations (0.0, 0.5, 1.0, 1.5, 2 g L−1) uptake seedlings were studied. increased biomass (dry weight) contents photosynthetic pigments a certain extent. concentration exhibited quadratic polynomial regression relationship with biomass. Exogenous total nitrogen (N) phosphorus (P) seedlings, whereas only 0.5 1.0 L−1 potassium (K) content. Similarly, also had N, P, K contents. Compared control, 2.0 shoot N content by 27.30, 32.99, 15.41, 12.93%, respectively, P 26.12, 37.52, 21.99, 9.61%, respectively. Furthermore, correlation grey relational analyses showed that carotenoid content, root biomass, soil alkali-hydrolyzable indicators most closely associated uptakes shoots. This study shows can promote at optimum L−1.