Abstract
A study was made of the inheritance of "light-sensitive" or earliness in response to relatively high temperature and long photoperiodic condition, and its linkage in barley. From the result, it was clearly known that the light-sensitive (Wechsel type) behaved as a simple recessive to the light-insensitive (Winter type) under an artificially controlled condition, although quite different segregation ratios were obtained when the same F2 seeds were sown outdoors in spring. This character pair, named Ls ls, was found to be linked with the hairy vs. non-hairy condition in the leaf-sheath (Hshs), with 6.4 per cent of recombination. However, this was inherited independently of the long vs. short haired rachilla (Ss). It was stressed that artificial control of the experimental condition is necessary tor this kind of experiment. Table 1. Segregation of the light-insensitive and sensitive character in F2 of a cross between two strains, A1 (light-insensitive or true winter type) and C (light-sensitive or "Wechsel" type), both being isolated from Iwate Mensury No.2. [table] Table 2. F2 segregation of light-insensitive vs. sensitive and hairy vs. hairless sheath character pairs in Iwate Mensury No.2 A1 × C cross. [table]
