عنوان مقاله [English]
Background and Objectives
Lentil is used mainly for human consumption as a source of protein and carbohydrate in soups, stews and vegetarian dishes. It is grown to improve economic returns to producers, diversify and lengthen crop rotations and reduce the requirement for nitrogen fertilizer. Lentil, is a member of the legume family, Leguminosae, can supply a significant part of its nitrogen requirement by fixing nitrogen from the air when inoculated with the appropriate rhizobial inoculant. The pattern of nutrients in the proximal composition of lentil is similar to that of other grain legumes, but seed protein content (19.5–35.5%) is less than in soybean. Fiber concentration is low and is largely within the seed testa, so the fiber in lentil meal can be reduced if it is de-hulled before grinding. In addition to high-quality protein, essential amino acids, and major minerals, the seed contains iron up to 505 mg kg-1 and zinc up to 330 mg kg-1 on a whole seed basis. Amino acids are help in tissue protein formation. Some amino acids are not synthesized in the body and it is necessary to take them in diet. Lentils contain different amino acids that can be used by most people. This research was carried-out to study effect of different amino acids on the activity of antioxidant enzymes, proline content and seed yield of lentil in delayed planting.
Materials and Methods
The research was conducted as a factorial experiment based on a randomized complete block design with three replications in the research farm of agricultural faculty, Tarbiat Modares University, through May to July, 2018. The studied factors included mode of application (priming, spraying and priming + spraying) and type of amio acids (Arginine, Aspartic acid, proline, trade amino acid (proamin) and distilled water (control)).
The results showed that the highest total dry weight was obtained from the application of arginine spraying (2330 kg ha-1) and priming + spraying aspartic acid (2388 kg ha-1) and trade amino acid (2219 kg ha-1). The highest amount of catalase (CAT) activity was observed in the treatment of distilled water by foliar application and its least activity was observed in the application of arginine as priming. The application of aspartic acid as acidic acid with 88.87 g m-2 produced the highest yield. So it is more than three times the performance of using distilled water (control). The application of arginine (55.51 g m-2), commercial amine (44.4 g m-2) and proline (32.78 g m-2) were established in the next rank, respectively.
According to the results of this study, amino acids can reduce the stress of heat. In the absence of amino acid, yield reduction will be higher. Although amino acids are a nitrogen source, the usually concentrations involved in exogenous supply are too low that its positive effects can be attributable to an increase in nitrogen availability. The application of aspartic acid via both priming and spraying is suggested as the best treatment.