Abstract This experiment was conducted in the tissue culture laboratory for postgraduate studies of Department Life Sciences College Science, Al-Qadisiyah University to obtain a study response Catharanthus roseus external growth stimuli, which include plant regulators, auxins (IAA, NAA, IBA) and cytokines (Kin, BA), under influence light conditions. On characteristics explants callus that incub...

The endogenous hormonal system plays a leading role in the regulation of growth and development of plants. This regulatory system responds sensitively to even slight changes in the plant environment, which is manifested in reorganization of the hormonal status. Detrimental factors lead to an imbalance in the content of different groups of phytohormones, as a rule reflected in the accumulation o...