2005 Volume 74 Issue 3 Pages 304-309
Eight blast resistance isogenic lines, “Koshihikari Niigata BL No. 1, No. 2, No. 3 and so on, were examined for their agronomic traits, qualities, and taste in comparison with those of “Koshihikari”, the original variety, and major varieties in Niigata Prefecture. From the results of an analysis of variance on main characters, significant differences among varieties were detected at a 1% level for heading date and grain quality, and at a 5% level for culm length and panicle length. Tukey comparisons at a 5% level indicated that only the difference in heading date between “Koshihikari Niigata BL No. 8” and “Koshihikari” was significant. However the difference was immaterial in practice because heading of BL No. 8 was only one day later than that of “Koshihikari”. A principal component analysis showed that all of the “Koshihikari BLs” took positions near “Koshihikari” in a scatter diagram for the first and second principal components, and the major varieties were distinct from the “Koshihikari BLs”. It was clear that the “Koshihikari BLs” had no differences in characters that were problems in practice and were distinct from major varieties. Therefore, we judged possible to supply them to general cultivation.
