Abstract
The main purpose of this study is to discuss the possibility of combining the favourable characteristics which exist independently in three types, i. e., Virginia, Spanish and Valencia. In the previous paper (SYAKUDO and KAWABATA 1963 a), the authors showed that crossings between varieties are successful both within each type and among the three types ; and the seed fertility of F1 plants is similar to that of the parents. The present investigation was undertaken to study the interrelationship of some main characters in the F2 generations. Phenotypic and genotypic correlations among the characters studied are presented in Table 3. In general, genotypic correlations are higher than the phenotypic correlations but the values themselves are very low, with few exceptions. The highest correlation is found between pod length and kernel length (O.935∼O.959 in genotypic and O.853∼0.899 in phenotypic, respectively). Comparatively high values are found between leaflet size and plant type index, and between length of branches and top weights. Both flowering date and oil content do not correlate with other characters studied. These results suggest that the combination of some favourable characters to form a variety may be successful. In addition, Table 2 shows the heritabilities in the broad sense for all characters in the three crosses. Plant type index and height of main axis showed relatively high heritabilities (O.89 and 0.82, respecitively). Kernel yield and air-dried top weights showed lower heritabilities (O.66 and O.64 on the average for the three crosses)
