“…Today, the traditionally known synthetic and natural plant growth regulators with auxin and cytokinin activity such as IAA, NAA, IBA, 2,4-D, 2,4,5-T, Zeatin, Kinetin, 2iP, BA, BAP, BPA [5][6][7][8][9][10][11] and new plant growth regulators such as BSAA (3-(benzo[b] selenienyl)acetic acid), 5,6-Cl 2 -IAA-Me (5,6-dichloroindole-3-acetic acid methylester) [12,13], TDS (thidiazuron) [13][14][15][16][17][18], as well as natural bioregulators [19][20][21][22][23][24][25][26] are widely used in the biotechnological practice for cultivation of isolated plant tissues and organs and microclonal propagation in vitro of medicinal and agricultural plants. Therefore, the elaboration of new plant growth regulators of synthetic or natural origin as effective substitutes of traditional regulators for practical using in the plant biotechnology is very important and urgent task.…”