Evaluation of fixed oil and fatty acids of black cumin under cobalt or kinetin treatments

Fixed oil of black cumin used for different cases of medicines and food. cobalt ion (co2+) is considered as a beneficial element for higher plants. lipid and fatty acids are influenced by cytokinins. black cumin plants were subjected to different levels of co2+(0,25,50 and 75 mg l1) or kinetin (0,10,20 and 40 mg l-1) during two successive seasons. the highest fixed oil contents [29.6,28.8% and yield (2.4,2.3 g plant-1)] were recorded at 75 mg l-1co2+ level during the first and second seasons respectively. major fatty acids (linoleic and oleic) increased with various treatments of co2+levels compared with control treatment. the changes in fixed oil and all fatty acid constituents were highly significant for co2+levels. 60 mg l-1of kinetin produced the highest contents of fixed oil with values of 33.3,36.7 % and 6.6,7.3 g plant-1during both seasons. the same treatment (60 mg l-1of kinetin) produced the highest values of main fatty acids [linolenic,linoleic and oleic]. the changes in the most of fatty acids were highly significant for kinetin treatments. © 2017.