Journal of Sericultural and Entomological Science (한국잠사곤충학회지)

Korean Society of Sericultural Science (한국잠사학회)
권호 표지

Effect of Boron in Nutrient Solution on Root Development and Freezing Tolerance of Mulberry

  • Le, Quang-Tu (Sericultural Research Center, Lamdong, Vietnam) ;
  • Keu (College of Agriculture, Kyungpook National Univ. Taegu, Korea, National Sericulture and Entomology Research Institute, Suwon)
  • Published : 1995.12.01
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Abstract

The experiment was carried out to define the effect of the boron in nutrient solution on the development of mulberry root and cold damage. The length of shoots only attained about 50cm and then stopped in case of boron deficiency, while the mulberry trees developed vigorous and attained over 190cm long under boron supply condition. When boron is deficient, the measles appeared on surface of the stem and the necrosis appeared on the petiole, midribs and veins of leaves. At 70 days after planting, almost all new roots and old roots changed to brown, the lateral roots became necrosis by boron deficiency. After three days of stopping boron supply, many new roots changed to brown and after two days of boron resupply, new roots began to grow out and then new roots normally developed. Content of boron in leaves and barks increased by the increase of boron concentration in nutrient solution and maximum boron content in leaves and barks was obtained with boron-sufficient treatment of 0.5ppm. Treatment of 0.5ppm boron supply indicated that the leaves and barks contained more phospholipid, protein, sugar, RNA and proline than treatment of 0.01ppm boron supply in nutrient solution. The cuttings grown in boron supply nutrition have a sufficient tolerance at -10$^{\circ}C$ and -15$^{\circ}C$ for 24 hours while cuttings grown in boron-deficient nutrition have a weak tolerance at the same condition. As mentioned above, we can conclude that the effect of boron deficiency on root development is much severe and the relationship between the lack of boron and cold damage is very closely related.

붕소 결핍이 식물의 뿌리 발육에 큰 영향을 미치고 있으며, 특히 붕소가 결핍하면 식물체의 내동성 물질로 알려진 당, 가용성 단백질, RNA, proline 및 인지질 등이 감소하기 대문에 붕소와 뽕나무의 뿌리 발육 및 내동성과 깊은 관계가 있을 것으로 예상하고 이에 대한 실험을 실시하여 다음과 같은 결과를 얻었다. 붕소를 주지 않은 뽕나무의 가지는 50cm 가량 밖에 자라지 않았으며, 붕소를 준 뽕나무는 190cm 이상 자랐다. 붕소를 주지 않은 뽕나무의 가지에 measles 현상이 보였으며 잎의 엽맥은 necrosis현상이 심하였다. 붕소를 주지 않은 뽕나무는 식재 초기에 새 뿌리가 나오다가 70일 후 부터는 새 뿌리와 묵은 뿌리 모두 갈색으로 변하였으며, 붕소시용 뽕나무의 뿌리는 새 뿌리가 왕성하게 발육하였다. 붕소를 주다가 붕소를 주지 않으면 3일 후부터 새 뿌리가 갈색으로 변하였으며, 붕소를 주지 않다가 붕소를 시용하면 2일 후부터 새 뿌리가 나기 시작해서 이것이 왕성하게 자랐다. 고농도 붕소 영양액(0.5ppm)으로 키운 뽕나무의 잎과 줄기 피충부에는 저농도 붕소 영양액(0.01ppm)으로 키운 뽕나무의 잎과 줄기 피충부에서 보다 붕소함량이 많았다. 고농도 붕소 영양액(0.5ppm)으로 키운 뽕나무의 잎과 줄기 피층부에는 저농도 붕소 영양액(0.01ppm)으로 키운 것보다 인지질, 단백질, 당, RNA 및 proline 함량이 많았다. 뽕가지를 -15$^{\circ}C$에서 24시간 처리한 결과 붕소를 준 뽕나무는 정상적으로 발아 하였는데, 붕소를 주다가 주지 않은 뽕나무와 처음부터 붕소를 주지 않은 뽕나무는 전혀 발아가 되지 않았다. 이상의 결과로 보아 붕소는 뽕나무의 뿌리 발육에 지대한 영향을 미치며 나아가서는 뽕나무의 내동성과도 관계가 있음을 알 수 있었다.

Keywords

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