• 한국잡초학회지
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• 제17권2호
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• pp.207-213
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• 1997

단일식물인 수수의 개화에 지베렐린이 관여하는지를 조사하기 위하여 지베렐린 생합성 억제제인 ancymidol을 처리한후 내생 지베렐린의 함량과 개화 및 생육에 미치는 영향을 조사한 결과는 다음과 같다. 1. 지베렐린 생합성 억제제 ancymidol은 공시한 두 품종 모두의 생육을 억제함과 동시에 개화를 지연시켰다. 2. $GA_3$를 Ancymidol과 동시에 처리할 경우 생육억제와 개화지연이 모두 회복되어 지베렐린이 수수의 개화에 관여함을 보였다. 3. Ancymidol 10ppm은 수수의 모든 지베렐린 ($GA_{12}$, $GA_{53}$, $GA_{44}$, $GA_{19}$, $GA_{20}$, $GA_1$ 합성을 현저히 억제하였다.

• Plant Breeding and Biotechnology
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• 제5권3호
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• pp.204-212
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• 2017

There is a growing preference for using doubled haploids (DHs) in maize breeding programs because they reduce the time required to generate and evaluate new lines to 2 years or less. However, there is an urgent need for efficient techniques that accurately discriminate between haploid and diploid maize kernels. Here, we investigate the effects of several hormones and chemicals on the germination of haploid and diploid maize kernels, including auxin, cytokinin, ethylene, abscisic acid (ABA) biosynthesis inhibitor (fluridone), ABA catabolism inhibitor (diniconazole), methyl jasmonate (MeJA), and NaCl. Ethylene effectively stimulated the germination of both haploid and diploid maize kernels. The ABA biosynthesis inhibitor fluridone, the ABA catabolism inhibitor diniconazole, and MeJA selectively stimulated the germination of haploid maize kernels. By contrast, gibberellin, 1-naphthaleneacetic acid (NAA), kinetin, and NaCl inhibited the germination of both haploid and diploid maize kernels. These results indicate that the germination of haploid maize kernels is selectively stimulated by fluridone and diniconazole, and suggest that ABA-mediated germination of haploid maize kernels differs from that of diploid maize kernels and other plant seeds.

• Journal of Plant Biology
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• 제21권1_4호
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• pp.13-21
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• 1978

The effect of cyclic-AMP on the induction of acid phosphatase activity in barley aleurone layers was examined. Tannic acid was used as a inhibitor. Decursinol and coumarin were also used as a comparison. Maxiumu promotion of the enzyme activity was obtained with 10-5M cyclic-AMP, but this promotion was lower than that of 10-5M GAS induced enzyme activity in incubation medium. The inhibition rate in the addition of tannic acid was shown 17% and 63% at a ratio to GAs (by weight) of 10 : 1, and 58% and 94% at a ratio of 100 : 1 treated with GAs, and cyclic-AMP, respectively. The most potentiation of 10-6M GAS effect was induced by the additiion of suboptimal concentration (10-6M) of cyclic-AMP. Additional GAs and cyclic-AMP were shown the recovery of the enzyme activity inhibited by tannic acid. The combination with cyclic-AMP and theophylline enhanced the enzyme activity, too. Any other nucleotides tested except cyclic-AMP didn't show the action. There were no differences in acid phosphatase isozyme patterns by polyacrylamide disc electrophoresis, in conjunction with the different additions but the size of bands showed great differences. Especially, the 3rd band and the 5th band group were remarkable.

• 원예과학기술지
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• 제31권1호
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• pp.38-49
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• 2013

Prohexadione-calcium (Pro-Ca), ethephon and transient water stress were evaluated in a factorial design, as potential inhibitors of early-season shoot growth of high density orchard management of apple (Malus domestica Borkh.) trees. In the experiment, water stress was imposed to one-half of the 7-year-old 'Golden Delicious'/M.9 apple trees in each of 5 blocks, by stopping irrigation for 3 weeks between 35 and 56 days after full bloom (AFB). Within each whole unit, the following Pro-Ca and ethephon treatments were randomly allocated at $2{\times}2$ factorial: a) 0 or 250 $mg{\cdot}L^{-1}$ a.i. Pro-Ca applied at 28 days AFB and b) 0 or 300 $mg{\cdot}L^{-1}$ a.i. ethephon applied twice (35 and 71 days AFB). All trees were hand thinned to king flowers prior to treatments. Vegetative shoot growth was markedly reduced by Pro-Ca, with its effect being obvious within 14 days after application, while ethephon and water stress treatments were less effective. Pro-Ca had no effect on fruit set and yield but slightly increased fruit size. Ethephon substantially reduced the fruit size and yield but had no effect on fruit set. Water stress reduced fruit set, fruit size and yield. With regard to fruit quality, Pro-Ca did not influence fruit shape, flesh firmness and soluble solids contents (SSC) but slightly reduced titratable acidity. Ethephon had no effect on fruit shape but increased firmness, SSC and acidity, while water stress did not influence these fruit quality attributes. Dry weight of dormant spur buds was reduced by both Pro-Ca and water stress, while increased by ethephon. The larger dormant buds led to the larger spur flowers at the tight cluster stage the following spring. Return flowering was promoted only by ethephon, especially on previous season's shoots. There were no significant interactions between Pro-Ca and ethephon or water stress on most variables observed in this study.

• 한국작물학회지
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• 제30권4호
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• pp.471-480
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• 1985

수도품종의 GA$_3$에 대한 절간신장반응을 지베렐린 생합성 저해제인 Paclobutrazol과 관련시켜 평가하여 효과적으로 벼의 절간신장을 조절하고자 본 실험을 수행하였다. 진흥, 미네히까리, 한강찰벼를 공시하여 생육시기별(최고분얼기, 유수형성기 및 감수분열기)로 GA$_3$는 0, 20, 50, 100ppm 용액을 엽면살포하였고, Paclobutrazol은 10a당 성분량으로 0, 10, 20, 30 g을 각각 토양에 처리하여 얻은 결과를 요약하면 다음과 같다. 1. GA$_3$는 최고분얼기와 유수형성기에 처리하였을때, 제 5절간 이하의 신장을 촉진하였으며, 감수분열기에 처리하였을 때는 제 3절간의 신장을 현저히 촉진하였다. 2. GA$_3$는 100ppm 용액을 처리하였을 때 진흥에서는 최고분얼기에, 미네히까리는 유수형성기에, 한강찰은 감수분열기에 처리하였을 때 간장은 대조구에 비해 각각 15.6, 15.9, 44.1%로 신장이 촉진되었으며, 한강찰이 GA$_3$에 가장 민감하게 반응하였다. 3. Paclobutrazol은 최고분얼기와 유수형성기에 처리하였을 때 제4, 5절간의 신장을 억제하였으며, 감수분열기에 처리하였을 때는 제 2,3절간, 특히 제 3절간의 신장을 현저히 억제하였다. 4. Paclobutrazol은 처리농도가 증가함에 따라 간의 신장이 억제되었으며, 감수분열기에 처리할 때 가장 억제되어, 대조구에 비해 진흥은 25.3%, 미네히까리는 22.8%, 한강찰은 13.9%정도 간장이 단축되었고, 한강찰이 Paclobutrazol에 가장 둔감한 반응을 나타냈다. 5. Paclobutragol은 주내 모든 이삭들의 간장을 고르게 감소시켜 주내 간장의 변이는 대조구와 거의 차이가 없었다. 6. 감수분열기에 GA$_3$를 처리하면 세 품종 모두에서 다소 수장이 길어지나, GA$_3$를 100ppm의 고농도로 감수분열기 이전에 처리하면 진흥과 미네히까리 품종에서만 수장이 짧아졌다. 7. Paclobutrazol을 유수분화기 이후에 처리하면 수장은 처리농도가 증가함에 따라 짧아지는 경향이었다. 8. GA$_3$나 Paclobutrazol을 처리하였을 때 간장과 수장과의 상관관계는 Paclobutrazol을 진흥과 미네히까리에 처리한 경우에만 고도의 정의 상관관계를 인정할 수 있었다. 9. 수당 영화수는 GA$_3$를 최고분얼기에 처리한 경우, 진흥과 미네히까리에서만 감소되었으나 한강찰에서는 차이가 없었다. Paclobutrazol 처리에 의해서는 최고분얼기나 유수분화기에 처리하면 수당 영화수가 감소하였으나 감수분열기에 처리하면 수당 영화수가 변하지 않았다.