Effects of Temperature and Plant Growth Regulators on Bud Sprouting of Stem Cutting of Hibiscus syriacus 'Honghwarang'

온도(溫度)와 생장조절물질(生長調節物質)이 무궁화(Hibiscus syriacus ''Honghwarang') 삽수의 맹아(萌芽)에 미치는 영향

Various temperatures and plant growth regulators were assessed to investigate the nature of the dormancy and bud sprouting of stem cutting of Hibiscus syriacus 'Honghwarang'. The bud sprouting was promoted as temperature increased. Under $30^{\circ}C$ condition, stem cuttings began sprouting at 4days after cutting and showed 100% sprouting at 6 days after cutting. With GA or BA treatment, the cuttings started sprouting at 6 days after cuttings under $25^{\circ}C$ condition and reached 65% sprouting, which was not different from the results without hormone treatments. However, ABA dipping under below $25^{\circ}C$ condition resulted in low sprouting, whereas under over $25^{\circ}C$ condition they started sprouting at 6 days after cutting and reached 93% at 12 days after cutting, which indicated that ABA is not effective on inhibition of sprouting under high temperature condition.

무궁화 (Hibiscus syriacus 'Honghwarang')의 휴면특성을 구명하고자 온도와 생장조절물질을 처리하여 맹아(萌芽) 차이를 비교하였다. 맹아는 온도가 높을수록 빨랐으며($10{\sim}30^{\circ}C$), $30^{\circ}C$ 무처리구는 삽목 후 4일만에 맹아하기 시작하여 6일경에는 100% 맹아했다. GA와 BA처리도 대조구인 무처리와 큰 차이 없이 $20^{\circ}C$ 이상의 온도에서는 6일만에 맹아하여 62.5%의 높은 맹아율을 나타내었다. ABA 침지처리는 $25^{\circ}C$이하의 온도에서는 맹아율이 저조하였으나, $25^{\circ}C$이상의 온도에서는 삽목 6일 후에 맹아하기 시작하여 12일 후에 93% 맹아되어, 고온 조건에서는 생장억제제인 ABA처리가 맹아억제에 전혀 효과가 없었다.