Abstract
A nutrient solution experiment was performed using sand culture to evaluate the effects of different glycine levels on the growth and nutrient uptake of coriander (<em>Coriandrum sativum</em> L.). Different glycine concentrations of 0, 5, 10, 20, or 40 mg L<sup>−1</sup> were applied to plants via Hoagland’s nutrient solution in a completely randomized design with four replications and under greenhouse conditions. The results showed that leaf SPAD (soil and plant analysis development; an indicator of leaf greenness) value, stem diameter, and fresh and dry weights of shoots and roots were significantly increased by 10 mg L<sup>−1</sup> glycine in comparison to the control plants. Application of glycine at 40 mg L<sup>−1</sup> reduced many plant growth parameters, whereas leaf proline concentration was increased. All glycine levels except for 40 mg L<sup>−1</sup> increased root fresh weight. Leaf protein content was increased by glycine applied at 10 or 20 mg L<sup>−1</sup>, whereas leaf antioxidant activity was increased at all glycine levels. Application of glycine increased leaf concentrations of nitrogen and potassium (at 10 mg L<sup>−1</sup>), magnesium (at 5 mg L<sup>−1</sup>), and zinc (at all glycine levels) compared to the control plants. The results indicate that moderate level of glycine (10 mg L<sup>−1</sup>) in the nutrient solution can improve the growth and nutritional quality of coriander.
Highlights
L−1, whereas leaf antioxidant activity was increased at all glycine levels
The increase in selected growth parameters under the influence of moderate glycine concentrations can be due to a stimulatory effect and the different roles of this amino acid in plant metabolism [4,5,19]
Plant growth is broadly related to leaf protein biosynthesis and protein content [4,5]
Summary
This study was performed in hydroponic sand culture during the spring of 2017 at the Faculty of Agriculture, Tarbiat Modares University, Tehran, Iran. Plants were supplied with Hoagland’s nutrient solution for the first 10 days after emergence. Thereafter, glycine treatments were applied to plants via the nutrient solution. Namely 0, 5, 10, 20, or 40 mg L−1, were applied to plants during the 5-week growth period. Standard Hoagland’s nutrient solution (without glycine) was used as a control treatment. Plants were fed daily with 200–400 mL of the nutrient solution per pot (with or without glycine), depending on the plant growth stage and plant size. Every 4 days, pots were washed with additional tap water to prevent salt accumulation in the root medium. Plants shoots were cut at the soil surface and roots were carefully separated from any adhering sand particles using tap water pressure. All samples were placed in an oven at 60°C for 48 h before determination of shoot and root dry weights
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