Indian Agricultural Research Institute, New Delhi
1Present Address: Institute of Advanced Studies, Meerut University, Meerut.
*Part of the Ph. D. thesis submitted by first author to the Post Graduate School, Indian Agricultural Research Institute, New Delhi-12 (1970).
Studies on changes in the level of auxins and inhibitors in regular and biennial bearing varieties during fruit growth indicate a high level of both types of substances in the early stages of fruit growth. While the inhibitor might be involved in fruit drop, the auxins appear to be important in the development of the fruit. The period of rapid fruit growth was associated with the period of maximum activity of auxins. The level of both types of substances was higher in the fruits of regular bearing varieties than those of biennial bearing one. There was no difference in the trend of changes in the level of auxins and inhibitors in biennial and regular bearing varieties.
