Abstract

It was stated in a previous paper by Ramanatha Ayyar and Balasubrahmanyan (1936) that the seed-coat colour Rood's brown corresponding to the seed grade CS 12 was formed by the addition of factor T to CS 10 and that T had no effect when P was absent. The inheritance and interaction of factor T studied further on other genetic backgrounds form the subject-matter of this paper. Six pure lines of gram whose genic constitutions are already known and given in Table 1 formed the parents of the five crosses made and studied in detail. Crosses between two Pusa types were generally of low productivity and as such failed to give sufficient population in second and third generations while other crosses with local type 19 were generally prolific yielding fairly large populations.

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