2025 Volume 94 Issue 1 Pages 30-41
Perilla is an important local resource that can attract people to mountainous areas. In Shitara-town, a mountainous area in Aichi Perefecture, perilla seeds from a native line are processed into gohei-mochi(rice cake) sauce and oil, which are sold locally. However, production is declining with theadvance in age of the producer. In this region the native lineis planted in early July and harvested in late October or early November. Because of the short harvest season, it is difficult for the same grower to expand the cultivation area for production. Early frosts in October lower yield and quality. We studied the effects of planting time on flowering, harvest time, growth, and yield in 2017 and 2018, using the local native line ‘Nagura’. We also used Line ‘No.1’ obtained by crossing the native line ‘Nagura’ with an early flowering line. The later the planting time of ‘Nagura’, the slower the growth and lower the yield were. The harvest time of ‘Nagura’ could not be dispersed by changing the planting time. On the other hand, the harvest time of ‘No.1’ varied with the planting time. Therefore, it may be possible to increase production by planned planting of new lines with adjusted flowering and harvesting times in combination with conventional lines.
