Tiarella polyphylla D. Don is a native plant distributed only in Ulleung Island in Korea and has been traditionally used for medicinal purposes, although it is also used ornamentally. This study was conducted to determine the requirements for dormancy break and germination and to classify the type of seed dormancy. The experiments were performed with cold stratification (0 or 12 weeks at 5℃), warm stratification (0, 4, 8, or 12 weeks at 23℃, followed by 8 weeks at 5℃, and then incubation at 23℃), and GA3 treatments (0, 10, 100, or 1000 ㎎/L). The treated seeds were incubated on aseptic media at room chamber (23℃, a 16h photoperiod of fluorescent lamps with 40 μmol ․ m-2 ․ s-1). The seeds were dispersed in nature as underdeveloped embryos with no physical barrier to absorb water to prevent water absorption. However, the seeds did not germinate for 30 days after sowing without any pre-treatments. Thus, the seeds had morphological dormancy (MD) and physiological dormancy (PD). The final germination percentage following cold stratification (0 or 12 weeks) was 66.7% and 45.6%, respectively. The cold stratification delayed seed germination by about 3 weeks. In the warm stratification experiment (0, 4, 8, or 12 weeks), the final germination percentage was 21.1%, 27.8%, 41.1%, and 57.8%, respectively, 20 weeks after sowing. The embryos of the T. polyphylla seed grew in relatively warm temperatures (23℃). GA3 application overcame seed dormancy and promoted germination. Following GA3 treatment (0, 10, 100, or 1000 ㎎/L), the final germination percentage was 33.3%, 45.0%, 42.5%, and 72.5%, respectively. These results suggest that the T. polyphylla seeds had non-deep simple morphophysiological dormancy (MPD) and GA3 treatment could be used as a substitute for warm stratification for breaking seed dormancy. To our knowledge, this is the first report of seed dormancy characteristics of the genus Tiarella native to Korea.

Abstract
 서 언
 재료 및 방법
  실험재료
  종자 소독 및 발아실험
  종자의 내･외부 형태 관찰
  수분 흡수 특성
  저온층적처리
  고온층적처리
  GA3 처리
  통계처리
 결 과
  종자의 내･외부 형태 관찰
  수분 흡수 특성
  저온층적처리
  고온층적처리
  GA3 처리
 고 찰
 적 요
 References

• 최 한(국립수목원 유용식물증식센터) | Han Choi (Useful Plant Resources Center, Korea National Arboretum)
• 이승연(국립수목원 유용식물증식센터) | Seung Youn Lee (Useful Plant Resources Center, Korea National Arboretum)
• 이용하(배재대학교 원예산림학과) | Yong Ha Rhie (Department of Horticulture and Forestry, Pai Chai University)
• 이정호(국립수목원 DMZ자생식물관리과) | Jeong Ho Lee (DMZ Botanic Garden, Korea National Arboretum)
• 김상용(국립수목원 유용식물증식센터) | Sang Yong Kim (Useful Plant Resources Center, Korea National Arboretum)
• 이기철(국립수목원 유용식물증식센터) | Ki Cheol Lee (Useful Plant Resources Center, Korea National Arboretum) 교신저자