Abstract
Electrophoretic studies of protein extracts from carrot calluses suspension-cultured on the media containing kinetin, BA, IAA, NAA or $GA_3$ at the levels of $10^{-6},\;10^{-5},\;10^{-4}M$, respectively, were performed to identify polypeptides and proteins regulated by auxin, cytokinin or GA. Fifteen bands of polypeptide(s) were observed in the callus cultured in the control medium devoid of growth regulators, and their molecular weights were $18._4,\;20._2,\;20._0,\;34._9,\;35._7,\;37._4,\;40._3,\;42._2,\;44._1,\;44._4,\;49._3,\;55._0,\;56._6,\;58._1,\;and\;59._9\;KD$, respectively. The synthesis of polypeptide appeared to be promoted in two bands by kinetin, in six bands by BA, in one band by IAA, in two bands by NAA, and in four bands by $GA_3$, while inhibited in five bands by kinetin, in three bands by BA, in four bands by IAA, in three bands by NAA and in three bands by $GA_3$. The polypeptides of $40._3\;KD\;42._2\;KD$ seemed to be regulated by cytokinins, and those of $44._1\;KD,37._4\;KD,\;and\;56._6\;KD$ by auxins. The proteins of three bands with relative mobilities of 0.56, 0.84, and 0.92, respectively, increased in the calluses cultured on the media containing kinetin, IAA, $GA_3$, NAA or BA, compared to the control, but it was difficult to identify the proteins specific for each growth regulator.
당근에서 cytokinin, auxin 또는 GA에 의해 조절되는 polypeptide 및 단백질들을 동정하기 위하여, kinetin, BA, IAA, NAA 혹은 $GA_3$가 각각 $10^{-4},\;10^{-5},\;10^{-6}M$인 배지에서 suspension culture 한 당근 callus들의 추출물의 전기영동양상을 조사하였다. 생장조절제를 처리하지 않은 callus에서 15개 polypeptide band가 관찰되었는데, 이들의 분자량은 각각 $18._4,\;20._2,\;24._0,\;34._9,\;35._7,\;37._4,\;40._3,\;42._2,\;44._1,\;44._4,\;49._3,\;55._0,\;56._6,\;58._1$ 그리고 $59._9KD$였다. Kinetin, BA, IAA, NAA 그리고 $GA_3$에 의하여 합성이 촉진되는 것으로 보이는 polypeptide band는 각각 2개, 6개, 1개, 2개 그리고 4개였고, 합성이 억제되는 것으로 보이는 것은 각각 5개, 3개, 4개, 3개, 그리고 2개였다. 분자량 $40._3KD$ 및 $42._2KD$의 polypeptide들은 cytokinin류 생장조절제에 의하여 합성이 촉진되는 것으로 나타났고, $44._1KD$의 것은 auxin류에 의하여 합성이 촉진되며 $37._4,\;44._4,\;56._6KD$의 것은 auxin류에 의하여 합성이 억제되는 것으로 나다났다. Kinetin, BA, IAA, NAA 및 $GA_3$처리에서 상대 이동도가 0.56, 0.84, 0.92인 단백질 band들이 증가된 것이 관찰되었으나, 각 생장조절제들에 특유한 단백질은 동정할 수 없었다.
(Department of Agricultural Chemistry, Cheju Nat'l University)
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