Abstract
Effect of collection time and low-temperature treatment period on endodormancy breaking of bulbil in Elatostema involucratum Franch. & Sav. (standard Japanese name; Uwabamisou) was investigated. The bulbils were collected three times from September to November. The period of low temperature treatment (at 2°C) was applied for 0–80 days for bulbils collected in September and October and for 0–60 days for bulbils collected in November. Among the bulbils collected in September and October, the sprouting rate at 21 days after planting was 90% or more by low-temperature treatment for 80 days. In bulbils collected in November, the sprouting rate at 21 days after planting was 90% or more by low-temperature treatment for 60 days. The collection of bulbils in November was not efficient because the bulbils had fallen onto the surface from the stem. Therefore, the endodormancy of bulbils collected in September and October was sufficiently broken by low temperature treatment at 2°C for 80 days.
