Some Amino Acids Affect the Response of Grape (Vitis vinifera L.) Single Nodules In Vitro Multiplication

Organic nitrogen, which comes from amino acids, is absorbed and transported more rapidly than inorganic nitrogen by plant cells and tissues. Therefore, this study was conducted to evaluate the effect of some amino acids on the response of single nodes of grape Vitis vinifera L. Superior and Red globe cultivars were classified for in vitro multiplication to develop an efficient protocol for propagation of these two valuable species. The study included two experiments: first, the effect of adding three concentrations (0, 0.5, and 1) mg L-1 of Benzyl Adenine (BA) to the MS medium in the initiation stage. The second investigation utilized three amino acid types (glutamine, asparagine, and methionine) at five concentrations (0, 10, 20, 40, and 80) mg L-1 added to MS medium containing 2 mg L-1 of BA. Results indicated that the most significant newly initiated shoots (2.40 and 2.88) and the largest leaves number (7.90 and 5.88) for both cultivars, Superior and Red globe, respectively were obtained in a medium with 1 mg L-1 of BA. The multiplication results in eight weeks after cultivation showed that adding amino acid glutamine at 10 mg L-1 significantly increased the number of shoots/explant (6.60 and 6.00) and (29.50 and 38.30) leaves/explant for Red globe and Superior, respectively. The high amino acid concentrations (40 and 80) mg L-1 significantly reduced the studied growth parameters, especially the number of newly formed shoots. The results obtained from the present study exhibited the possibility of applying this modified protocol to the propagation of selected grape cultivars to encourage the expansion of the grape-growing industry in Iraq.