Background: Many Taraxacum spp. plants are widely used in medicine, but some of them have propagation problems, such as strong dormancy and poor germination rates. This study investigated the effects of temperature, gibberellic acid (GA3), and potassium nitrate (KNO3) on seed germination in Taraxacum ohwianum.
Methods and Results: The seeds (NIBRGR0000135524) were exalbuminous, and their length and width were 4.54 ± 0.032㎜ and 0.97 ± 0.029㎜, respectively. Various germination temperatures were tested (15, 20, 25, and 30℃), the optimum temperature for germination was found to be 20℃ (31.3%). High temperature (30℃) resulted in non-typical seedlings (thickened and crumpled cotyledons, with a restricted root system). To increase the germination capacity, GA3 (200, 500, and 1,000 ㎎/ℓ ) or KNO3 (20, 50, 100, 200, and 500 ㎎/ℓ ) solutions were used as pre-soaking solutions instead of water. The GA3 treatments increased the germination percentage and rate, but germination percentage was higher with the KNO3 treatments. Under the 50 - 200 ㎎/ℓ KNO3 treatments, the germination percentage exceeded 80% after 12 days, and 50 ㎎/ℓ KNO3 was notably effective (91.2% after 15 days).
Conclusions: T. ohwianum seeds showed improved germination at low temperatures. The best method for germination was presoaking in 50 ㎎/ℓ KNO3 for 24 h, in the dark at 4℃, and then incubating the germinated seed at 20℃ for 15 days.

서 언
 재료 및 방법
  1. 실험재료
  2. 종자의 형태학적 특성 및 활력검증
  3. 종자 발아 실험
  4. 통계처리
 결과 및 고찰
  1. 종자의 형태적 특성 및 활력
  2. 온도조건에 의한 발아특성
  3. 지베렐린에 의한 발아촉진 효과
  4. 무기염류에 의한 발아촉진 효과
 REFERENCES

• 신소림(국립생물자원관) | So Lim Shin
• 임윤경(국립생물자원관) | Yun Kyung Lim
• 권혁준(국립생물자원관) | Hyuk Joon Kwon
• 김수영(국립생물자원관) | Soo Young Kim Corresponding author