Effects of 2-Chloroethylphosphonic Acid on Ripening and Total Alkaloid Content of Tobacco Leaves.

잎담배의 성숙촉진 및 Alkaloid 함량에 미치는 2-Chloroethylphosphonic Acid의 효과

The present experiments were carried out to find out the proper concentration of CEPA(2-chloroethy-lphosphonic acid) for the purpose of accelerating the leaf maturity and of reducing the nicotine content of tobacco. Varried levels of CEPA were sprayed Yellow Special A right after topping. The effects of each level CEPA treatment on leaf ripening and total alkaloid contents were periodically observed. The results are summarized as follows; 1. The higher the CEPA concentration was, the more the leaf maturity was accelerated. During the period from six to 11 days after treatment, the differences of leaf maturity among levels were prominent. 2. Treatment with CEPA only on the upper surface of the tobacco leaf, accelerated the maturity of that particular part treated, but not apparently the other parts of leaf. 3. The higher the CEPA concentration was, the more the accumulation of the total alkaloid was reduced. The reduction of alkaloid accumulation was evident after acceleration of leaf maturity. 4. Distinctive acceleration of leaf maturity was observed in the fully developed lower leaves, while reduction of alkaloid accumulation in the growing upper leaves. The degree of total alkaloid content reduced in the ripened leaves, however, were similer to all the leaves at different positions. 5. Yields of tobacco leaves were not significantly affected by CEPA treatment. 6. In the present experiments, it may be concluded that CEPA2, 000ppm is the most applicable level for accelerating leaf maturity and decreasing total alkaloid content. In the view point of the practical use, however, the applicable level is assumed to be properly choosed between 500 to 2, 000ppm, depending on the situations. 7. The mechanism of accelerating maturity and reducing alkaloid accumulation of tobacco leaves by CEPA, is further to be explored.

CEPA를 답전작 및 우기전에 수확이 가장 빨리 촉진되면 또 니코친 함량이 저감되는지를 알고저 Yellow Special A 품종을 공시하여 적심 직후해당 농도의 CEPA 수용액을 살포한 후 일정기간을 두고 수확하여 처리수준별 성숙도 및 전 alkaloid함량을 조사하였던 바 그 결과는 다음과 같았다. 1) 처리농도가 높을수록 잎담배 성숙에 미치는 효과가 컸으며 그 효과는 처리 후 6-11일간에 있어서 현저하였다. 2) CEPA는 엽표면에만 처리해도 효과가 있으며 성숙촉진효과는 처리부분에 있어서 더욱 뚜렷하였다. 3) 처리농도가 높을수록 잎담배의 전 alkaloid 함량이 감소되는 경향이 있으며 그 효과는 성숙촉진작용후에 더 크게 나타났다. 4) CEPA의 성숙촉진작용은 성수기에 가까운 하부엽에서 컸고 alkaloid 축적억제작용은 반대로 숙기에 도달하지 않은 상부엽에서 컸다. 그러나 적기수확엽에 있어서는 축적억제효과가 부위에 관계없이 같았다. 5) CEPA 처리는 수량에 변화를 주지 않았으며 시용 적정농도는 500-2,000ppm 사이라고 느껴졌다. 6) CEPA의 성숙촉진 및 alkaloid 합성억제작용의 기구에 관하여는 금후 더욱 연구할 필요가 있다고 보았다.