Abstract: Effect of hormone combinat ions, AgNO₃ and agar concentrat ion on shoot and plant regeneration from cotyledonary explants of Chinese cabbage was described. Maximum shoot regeneration was obtained in MS medium containing 5 mg/ L BA, 0. 5mg/ L NAA, 2 mg/L AgNO₃ and solidified with 1. 2 %- 1. 6 % agar. Ethylene production from cultured explants seemed to play important role in shoot regenerat ion. Explants of cultivars with high regenerat ion frequency or if cultured on the medium solidified with higher concentration of agar generally showed low levels of ethylene product ion. However, AgNO₃, which also enhanced shoot induction, resulted in an
increase in ethylene production. The possible interaction between ethylene and shoot regenerat ion is discussed.

Key words: Chinese cabbage (Brassica campestris L. ssp. pekinensis), Cotyledon culture, AgNO₃, Ethylene