Effects of Seed-coat Softening and Prechilling on Seed Germination and Bulbil Formation of Polygonatum odoratum Druce

둥굴레 종자의 발아(發芽) 및 소주아(小珠芽) 형성(形成)에 대한 저온(低溫)과 종피연화(種皮軟化) 처리(處理)의 영향(影響)

Solomon's seal (Polygonatum odoratum) was traditionally propagated by its rhizomes but seed propagation has not been practiced due to their dormancy and high price. To improve the seedling production through seed pretreatments, the experiment was conducted to determine the effect of seedcoat softening and seed prechilling on seed germination and bulbil formation of the seal. The prechilling was done for 4 to 16 weeks at $3^{\circ}C$ and the softening was forced with 10% KOH for 40 minutes. Seed germination, bulbil formation and length, no. of root and root length were measured at 6 and 12 weeks after sowing. Seed germination and bulbil formation were greater at 8 to 12 week prechilling than at shorter or longer treatment when only the prechilling was enforced. Prechilling had greater effect compared to seed coat softening. In addition, the softening treatment before prechilling showed higher germination and bulbil formation compared to single treatment of them. The softening treatment prior to prechilling was better than the reverse treatment in number of root except the above two characters. Duration of prechilling treatment was able to be shortened below 8 weeks when the softening treatment was applied before prechilling.

저온과 종피연화의 처리방법을 설정하여 둥굴레 종자를 이용한 다량육묘에 필요한 정보를 제공하고자 저온처리기간 (4, 8, 12, 16주), 종피연화(10% KOH, 40분)와 저온의 혼용(混用) 처리방법(處理方法)이 발아(發芽), 소주아(小珠芽) 형성(形成) 및 발아개체 등에 미치는 영향을 조사하였던 바 그 결과를 요약하면 다음과 같다. 1. 발아률(發芽率)과 소주아(小珠芽) 형성률(形成率)은 저온만 처리할 경우 $8{\sim}12$주가 적정 기간으로 판단되었으나 종피연화와 혼용처리(混用處理)할 경우 저온처리기간을 8주 이내로 대폭 단축할 수 있는 것으로 나타났다. 2. 둥굴레 종자의 발아는 종피연화와 저온을 각각 단용처리(單用處理)하는 것보다는 이들의 혼용처리(混用處理)에서 향상되었으며 종피연화처리 효과보다는 저온처리의 효과가 큰 것으로 분석되었다. 3. 발아(發芽) 및 소주아(小珠芽) 형성률(形成率)은 종피연화 처리를 저온 처리 후에 실시하는 것보다는 전에 실시하는 것에서 양호하였고, 근수(根數)에서도 이와 유사한 경향을 보였다.