In this study, we investigated the effects of GA3 treatment duration and chilling treatment before sowing, and germination temperature on the germination of dried wasabi (Wasabia japonica (Miq.) Matsum.) seeds in October sowing. As the GA3 treatment duration before sowing increased to 10 days, the germination rate improved significantly. The germination rate at 15 ℃ was higher than those at 10 ℃ and 20 ℃. However, using the seeds treated with GA3 for 10 days followed by wet chilling treatment at 5 ℃ for 10 days, germination rates at 10 ℃ and 20 ℃ were improved, i.e., respectively, 63 % and 69 %, and have almost the same germination rate at 15 ℃. Since the germination rate of seeds treated with low temperature after GA3 treatment was high in a wide temperature range, it may be possible to construct a systematic seeding raising system even in October when germination is unstable.

No abstract

No abstract