Oil palm cultures respond to external factors such as high osmoticum. It was observed that a high concentration of glucose (0.55 M to 0.82 M or 10% to 15% w / v) induced terminal inflorescences (TI) and rigidity in vitro shoots. The occurrence of TI  and rigid shoots varied from clone to clone. TI and rigid shoots also differed in their morphology within the same flask . This indicated that cultures responded differently in their development to glucose treatment. Thus, sensitivity of the cultures to high concentrations of glucose has potential to be used as a  technique for in vitro indexing of the stability of oil palm clonal materials.