Abstract：In this paper the author report that the extract of rice vinegar affects the growth and differentiation of carrot callus. The concent ration of rice vinegar at the range of 6一16ml/L will promote the growth of callus more effectively.
Physical and chemical analyses show that rice vinegar contains nucleo-tide and four cytokinin-like substances in addition to more than fourteen amino acids. It may be the cooperation of those amino acids, nucleotide and cytokinin-like subotances that promote the growth of callus . Rice vin-egar not only promotes the growth of carrot callus, but also affects its diff erentiat ion owing to the interaction of the different hormones in medium .It is also known that rice vinegar can raise the yield of crops such as rice, wheat, rape etc . The author think the reason for it may be related to nucleot ide and cytokinin, as well as amino acids.
1983, Vol. 10 
