A cross between Brimful from Nepal (a scented variety with high protein) and Nippon bare (a Japanese rice variety) was carried out in 1977 and F
2-F
5 plants were grown from 1978 to 1982. The present experiment was conducted for getting the informations on breeding of rice variety with high protein. The results obtained are summarized as follows : Grain protein content in F
2 and F
3 plants showed wide and continuous distributions. Mean of F
2 plants was located between P
1 (high protein parent) and P
2 (low protein parent) and slightly lower than the mid parent (Figs. 1, 2). The narrow sense heritability of protein content based on the variance and co-variance of F
2 and F
3 plants was O.588. As concerns protein content and agronomic characters, result of F
5 plants did not show significant correlation except one line (Table 8). These results indicated that it was possible to select promising lines having high protein property and desirable agronomic characters. As compared with F
3 and F
4 generations, F
5 was high in mean value of protein content and also decreased in the genetic variance of protein one (Tables 1, 2, 7). High protein property showed the tendency of being bred in true in F
5 generation. As for amino acid contents in F
4 and F
5, there were significant differences among the lines in three amino acids per dry weight basis, not per protein basis, and the lines were far better in the trait than Nippon bare (Tables 4, 9). Significant correlation was observed between protein content and lysine and threonine per dry weight in F
4 and F
5 plants (Tables 5, 10). The promising lines which have high protein property and also relatively good agronomic characters were selected based on thc measured results in F
5 plants (Table 11).
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