Division of Genetics, Indian Agricultural Research Institute, New Delhi-12
*Paper presented at a Symposium on “New Research Trends in Agriculture”, Kanpur, U.P., February, 1969.
Six cultures derived from disruptive selection for flowering time in Brassica campestris var. brown sarson were tested at fifteen locations representing a wide spectrum of varying environmental conditions in Northern India. Stability parameters were determined according to the standard statistical techniques. DS 17 M was found to be generally adapted throughout Northern India under both high and low yielding conditions. DS 17 and DS 1 were superior under rich environments while DS 2 and DST 4 were superior under poor environments.
The stability of performance could not be related with the type of incompatibility or the level of ploidy of the populations.
The possibility of detecting early genotypes suitable for high yielding conditions under intensive agronomic practices and prediction of greater yield improvement in erect growing SC lines by adopting appropriate breeding procedures have been explored. The factor responsible for wide adaptability have been discussed. A brief scheme related to the adaptive specificities has also been given.
