Effects of seed grading on seed germination of seed propagation type of F1 hybridstrawberry( Fragaria×ananassa Duch.)

摘要

For practical use of seed propagation type of F1 hybrid strawberry, high germination percentage with uniformityare essential. Therefore, the effects of seed grading on seed germination of seed propagation type of F1 hybridstrawberry were investigated in order to improve the germination performance. Seeds of the F1 hybrid cultivar‘Chiba F-1 gou27 and open-pollinated seeds of ‘Tochiotomeu27 were used. Seeds were graded by specific gravity, sizeand color. The ‘Chiba F-1 gou27 seeds with large specific gravity resulted high final germination percentage with lowT50 value. The size distributions in number of seeds were gradually increased up to 1,000 μm. But there are fewseeds of size of over 1,000 μm. There were no differences in the final germination percentage values in the seeds of‘Tochiotomeu27 graded by seed size. The cotyledon size and fresh weight of seedling were large from large seeds.These results indicated that there were few effects of seed grading on germination performance because the seedsused in this study had high germination performance. It seems that seeds of low germination performance werepreviously removed in the process of enzyme treatment of seed preparation method.