• 한국작물학회지
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• 제28권1호
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• pp.94-99
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• 1983

'81년 태풍 Agnes호에 의해 피해를 받았던 전북지방의 수도 품종들을 대상으로 도복의 원인을 벼의 절간을 대상으로 형태 및 생리적으로 조사분석 하였던 바 그 결과는 다음과 같다. 1. 도복 피해는 서광벼, 한강찰벼, 낙동벼가 심하였고 단간종인 밀양 30호는 경미하였다. 2. 절간장이 길고 단위절간중이 가볍고 간태와 간벽이 가늘수록 도복에 대한 저항성을 약화 시켰음을 명백히 알 수 있었다. 3. 도복된 포장의 벼는 정상답의 벼보다 촤절중이 갑벼고 절간장, 단위절간중과 촤절중과는 유의적인 상관관계가 있었다. 4. 절간에 전질소함량이 낮고 인산, 규산, Cellulose, 전분함량이 많을수록 도복에 대한 저항성을 높였다. 5. 도복에 저항력이 약한 품종은 간장과 단위절간중이 도복답과 정상답과의 차가 크고 저항력이 강한 품종은 그 차가 적었다.

• Journal of the Korean Wood Science and Technology
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• 제46권4호
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• pp.315-322
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• 2018

Bamboo culm comprises internodes and nodes and is tapered from the bottom to the top. Anatomically, bamboo culm comprises vascular bundles and parenchymal base tissue. The gross anatomical structure of a transverse section of any culm internode is determined by the shape, size, arrangement, and number of vascular bundles. The purpose of this research was to examine the morphology of culm and the distribution and shape of vascular bundles in Ampel bamboo (Bambusa vulgaris). Bamboo culms were harvested from the base. Test samples were obtained from a central 2-cm long segment of each internode across the entire length of the culm. Results showed an uneven spread of vascular bundles in the internode cross-section. Transitioning from the outer to the inner layer of the internode, the number of vascular bundles per unit area decreased and their shape was variable. The size of vascular bundles in the middle layer of the internode was greater than that of those in the outer and inner layers. The shape of vascular bundles was circular in the outer layer, which gradually transformed into vertical oval toward the middle layer and horizontal oval toward the inner layer. Vascular bundles were of type III and IV in the bottom of the culm and type III in the middle to the top of the culm.

• 한국작물학회지
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• 제28권1호
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• pp.100-106
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• 1983

이 연구에서는 벼 생육기 침수에서 피해가 가장 뚜렷이 나타나는 주요생육형질의 품종간 차이와 벼의 생식생장기 침수에서 피해를 크게 좌우하는 임실장해의 정도가 가장 예민하게 나타나는 시점을 찾기 위하여 벼의 포기단위, 이삭단위, 그리고 영화단위로 청수와 탁수로 처리하여 얻어진 결과를 요약하면 다음과 같다. 1. 침수일수의 증가에 따라 엽초의 이상신장량이 많아졌고, 침수후의 초장신장량 및 분벽수는 감소되었으며 출수지연일수가 길어졌다. 2. 일/인형 품종은 일본형 품종에 비하여 엽초의 이상신장량이 적고 침수후 초장 신장의 억제 및 분벽력의 감소가 적었다. 3. 침수에 의한 임실장해가 가장 심한 시기는 청수와 탁수 모두 출수기이었으며 특히 출수전의 수잉기말에서 출수후 개화하기 전이었다.

• Journal of the Korean Wood Science and Technology
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• 제16권1호
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• pp.45-54
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• 1988

This study was carried out to investigate the fiber length, fiber width and fiber thickness on the longitudinal direction by the parts of culm and also specific gravity in air dry, dyna.mic mechanical properties and internal frictions by the internode and the node in Phyllostachys bambusoides Phyllostachys nigra var. henonis and Phllostachys edulis which were grown in Korea. The results obtained were as follows; 1. The variations of fiber length and fiber width on the longitudinal direction had a tendency to increase slightly from the butt and then to decrease toward the top. but there was not a definite variation for fiber thickness according to the parts of culm. 2. The specific gravity in air dry of internode was increased from the butt toward the top, but the specific gravity in air dry of node was not correlations with the parts of culm. 3. Dynamic Young's modulus of internode on the longitudinal direction was increased according to the heights of culms within each species, and there were in order of P. edulis P. nigra var. henonis and P. bambusoides. 4. Correation coefficients between the specific gravity and the dynamic Young's modulus were 0.837 in P. bambusoides 0.871 in P. nigra var. henonis and 0.935 in P. edulis and there was also highly significant for dynamic Young's modulus between the specific gravities in air dry. 5. There were not correlations between the internal frictions and the parts of internode.

• 한국토양비료학회지
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• 제34권3호
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• pp.173-177
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• 2001

This study was conducted to investigate a potential utilitization of multivariate statistical analysis(Factor analysis, Discrimination analysis) on interpretation of rice plant lodging reason. Rice plants were sampled in paddy around Taegu city at from 25 to 29 of September in 2000. Mineral nutrient content(phosphate, potassium) of rice plant were significantly higher at 99% level, Silicate content were lower at 95% level in lodged samples than in normal. Plant characteristics associate with lodging(Culm length, second and third internode length, bight of center gravity) were significantly longer in lodged rice plant than in non lodged. Result of Factor analysis were that first principle component were culm length, second(N2) and third internode length(N3), second principle component were Ca content, first internode length(N1) and N3/culm length, third principle component were center gravity length(G) and G/culm length, fourth were nitrogen, phosphate, and potassium content, fifth were N2/culm length, N2+N3/culm length, Sixth was silicate content of rice plant. Linear discriminant equation distinguished lodged rice plants with non lodged rice plants very well. Prediction value was 100%, most explainable variable were phosphate content, culm length and third length.

• 한국작물학회지
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• 제33권3호
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• pp.236-241
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• 1988

수도 Japonica 품종들에 있어서 GA$_3$에 적절히 반응하는 품종을 선발할 것을 목적으로 출수기 30일전에 GA$_3$ 50ppm을 처리하여 간장, 절간장, 신장절간수 및 수장에 미치는 효과를 조사하였다. 3. 결과를 요약하면 다음과 같다. 1. 대부분의 품종에서 GA$_3$ 처리가 간장을 증가시켰으나 그 정도는 일률적이지 않았으며 간장이 단축된 품종도 있었다. 단간품종이 장간품종보다 상대적으로 절간신장 정도가 컸다. 2. GA$_3$를 처리하여 각 절간별로 신장정도를 보면 제 1, 5, 6, 7절간은 증가하였고 제 2, 3, 4 절간은 오히려 단축되었다. 특히 제3절간은 현저하게 단축되었고 제5절간은 현저하게 증가하여 간장의 증감은 제 3절간과 제 5절간에 의해 좌우되었다. 3. 뚜렷한 신장반응을 보이는 절간수는 많은 품종에 있어서 변화하지 않았으나 1절간 증가한 것이 41 품종, 2절간 증가한 것이 5품종 있었다. 그러나 3품종은 1절간이 감소하였다. 4. GA$_3$를 처리함으로써 수장은 대체로 감소하는 경향이었으며 단간과 장간 품종에서 모두 일정한 경향을 보이지 않았다. 5. GA$_3$ 반응성외 정도를 6개군으로 구분하였는데 많은 품종들이 반응하지 않는 0군에 포함되고 간장이 25% 이상 증가한 것과 15% 이상 단축된 것도 있었다. 이것은 생육시기에 따라 GA 반응이 다르다는 이전의 보고를 감안하여 품종군 구별에는 GA$_3$ 처리시기가 고려되어야 할 것으로 고찰하였다.

• 한국작물학회지
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• 제25권1호
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• pp.20-24
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• 1980

Seven different rice cultivars treated with different levels of gibberellic acid (0, 10, 50 and 100 PPM GA3) at panicle initiation stage. showed retardation effect on the panicle length and the 2nd internode from the top, where as, the total culm lengths were remarkably elongated, about 50-120% in short varieties and about 10-15% in the tall varieties over the control, mainly, because of the lower internodes elongation. The 2nd internode of Gamadi variety from Nepal was almost entirely shortened with GA3 application.

• Journal of Plant Biology
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• 제14권3호
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• pp.29-35
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• 1971

Various types of short culm rice mutants were obtained by means of gamma-ray irradiation. In the present paper morphological observation and analysis of silicate content of the mutants are reported. 1. Short culm type had more useful characters than bushy and dwarf types. 2. In short culm and bushy types the number of nodes both above and under ground was similar to the mother varieties, while in dwarf type it decreased. 3. In short culm types the variation of length of above-ground culm and internodes tended to vary relattive to the mother varieties. 4. Positive correlation was found between culm length and the first and fourth internode length in short culm type. 5. Silicate content increased in short culm type-the increment being variety specific.

• 한국작물학회지
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• 제44권3호
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• pp.248-252
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• 1999

This study examined the effects of growth retardants and midsummer drainage on lodging-related characters in direct seeding rice culture on flooded paddy surfaces. Treatments included in this study were continuous flooding, two time midsummer drainages (TTD), and inabenfide or trinexapac-ethyl application after TTD. Culm length was reduced most by 11.4cm in trinexapac-ethyl treatment after TTD, followed by 4.1cm in inabenfide treatment after TTD compared to TTD treatment. A significant reduction in culm length occurred at the 3rd internode in inabenfide treatment applied at 40 days before heading (DBH), while trinexapac-ethyl application at 8 DBH reduced the 3rd>2nd>1st internode. The culm diameter of the 4th internode was increased by the application of trinexapac-ethyl following TTD compared to TTD treatment. Thickness of culm wall was significantly increased by trinexapac-ethyl but not by inabenfide applications. Lodging index was the highest in continuous flooding and the lowest in trinexapac-ethyl treatment after TTD. Subsequently, field lodging did not occur in plots treated by trinexapac-ethyl. Rice plants subjected to midsummer drainage or growth retardants showed higher ripened grain ratio and 1000-grain weight, resulting in higher rice yield. These results indicate that trinexapac-ethyl, which can be applied at the relatively later growth stage after proper judgement of lodging occurrence, could be a useful tool for reducing lodging in direct seeding rice culture on flooded paddy fields.

• 한국작물학회지
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• 제35권3호
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• pp.218-223
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• 1990

벼 기계이항답에서 후기의 도복을 경감시켜 농작업의 효율성을 높이고 수량손실을 방지하기 위하여 개발중인 도복경감제 'KIM-112'의 효과를 검토하고자 처리시기 및 약량을 달리하여 수행한 시험결과를 요약하면 다음과 같다. 1. KIM-112의 출수전 30일-5일 처리는 간장을 크게 단축시켰는데 10a당 1g 처리에서는 처리시기에 따라 10-17%, 2g 처리에서는 16-23%의 간장단축효과가 있었다. 2. 절간장 단축정도는 처리시기에 따라 다르게 나타났는데 출수전 30일 처리에서는 5절간이 약 50%정도 단축되었으며 처리시기가 늦어질수록 상위절간의 단축이 커지는 경향이었고, 약량별로는 2g 처리가 다소 높았다. 3. 간장과 도복지수와는 간장이 길어질수록 도복지수가 높아지는 정의 관계가 있었으며, 특히 1절간장과 4절간장이 도복지수에 크게 영향을 미쳤다. 4. KIM-112는 간벽 간경 간기중 등의 도복형질에는 영향을 미치지 않았고, 좌절중의 증대와 간장단축에 따른 moment의 감소로 내도복성을 향상시켰으며, 도복지수는 좌절중 moment 이삭중과 높은 상관이 있었다. 5. 약제처리시기와 약량에 따라 출수가 1-4일 지연되었으며, 수장이 짧아짐에 따라 수당립수가 다소 적었으나 도복이 되지 않아 등숙율의 향상으로 수량은 약간 증수되었다.