• 한국작물학회지
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• 제50권1호
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• pp.28-31
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• 2005

To identify salt-tolerance characteristics of corn seedling was treated in solution of 0, 50 and 100 mM NaCl of hydroponic cultivation. In photosynthesis of corn seedling, there was no large difference between 50mM and 0 mM NaCl solution, however, in 100 mM NaCl solution, the tolerance gradually decreased to $76\%,\;49\%,\;and\;31\%$ after one day, four days, and seven days, respectively, in comparison to 0 mM NaCl solution. Osmotic potential of corn in seedling period was significantly decreased with increasing saline level, however, free proline content in the plant on the ground was significantly increased with increasing saline level and with the lapse of time. In terms of correlation among major characteristics, there was a highly significant positive difference between osmotic pressure potential and photosynthesis, However, highly negative correlation was found between osmotic pressure potential and free proline content. In addition, it was expected that young seedling of corn with saline tolerance may be utilized in the transplantation in salt-accumulated land. Based on above-shown result, in terms of saline tolerance of Chalok-2 variety, growth suppression was serious with 100mM NaCl solution. However, growth was expected that seedling growth would be favorable under 50 mM NaCl solution.

• 원예과학기술지
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• 제32권5호
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• pp.730-738
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• 2014

The objective of this study was to evaluate glucosinolate (GSL) profiles and variation of total and individual GSLs concentrations within seedling (0-14 days) and growth stages (0-15 weeks) of Korean Chinese cabbage (Brassica rapa L. ssp. pekinensis). Ten GSLs (progoitrin, glucoraphanin, glucoalyssin, gluconapin, glucobrassicanapin, 4-hydroxyglucobrassin, glucobrassicin, 4-methoxyglucobrassicin, neoglucobrassicin and gluconasturtiin) were identified from Korean Chinese cabbage. In general, total GSL content significantly decreased during seedling (from 92.89 to $35.26{\mu}mol{\cdot}g^{-1}$ DW) and g rowth stages ( from 74.11 to $1.97{\mu}mol{\cdot}g^{-1}$ DW). Gluconapin was the highest in seeds and in the germination period ($73.1{\mu}mol{\cdot}g^{-1}$ DW) and declined gradually from 73 to 15% during seedling stages. The level of the major aliphatic GSLs, gluconapin and progoitrin, tended to decrease sharply, whereas levels of indolic GSLs (4-methoxyglucobrassicin, glucobrassicin) and aromatic GSLs (gluconasturtiin) were found to increase generally at the beginning of growth stages.

• 한국약용작물학회지
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• 제20권5호
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• pp.365-371
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• 2012

This study was carried out to know the characteristics of flowering and bearing fruit, the optimum period, regions and methods for seed harvesting, the optimum temperatures for seed storage and germination, and the optimum period for sowing at nursery bed and seedling transplanting of Valeriana fauriei Briquet. The flowering and bearing fruit of Valeriana fauriei was developed from the before-year root. Optimum period for seed harvest of Valeriana fauriei was from late July to middle August, and optimum areas were the high elevated areas over 500 m above the sea level as Jinbu-myeon, Pyeongchang-gun, Gangwon-do. Using of net-bag for seed harvesting was the effective method to gather the full ripe seed, and bagging of net-bag was necessary from the season of middle May that was the flowering middle-stage. Germination rates don't show the difference among the different temperatures of storage as approximately 41% at $-20^{\circ}C$, $2^{\circ}C$ or $20^{\circ}C$ of seed storage temperatures. The optimum temperature range was in $15{\sim}30^{\circ}C$ for seed germination at nursery bed. The optimum period for seed sowing at nursery bed was the late February, and the optimum period for seedling transplanting was the middle April.

• Journal of Forest and Environmental Science
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• 제28권1호
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• pp.12-18
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• 2012

Like any other natural resources, forest flora may experience the extreme threat of elevated temperature and saline water submergence at different stages of their lives i.e. from germination to maturity due to climate change effects. The overall aim of the study was to measure the effect of higher temperatures along with saline water irrigation on survival and initial growth during seedling stage of Artocarpus chapalasha. The experiment was conducted in temperature- humidity-photoperiod regulated plant growth chamber during stipulated period to measure the growth performance of randomly selected seedlings. Within three different elevated temperatures viz. $30^{\circ}C$, $32^{\circ}C$ and $34^{\circ}C$, the seedlings were given three different saline conditions such as 0.5 g/L, 1.5 g/L and 2.5 g/L NaCl concentrations. Results found from the experiment was that, seedlings of Artocarpus chaplasha reared at different temperatures and saline water treatments showed stunted growth than reared at existing outdoor temperature ($26.31^{\circ}C$) irrigated with regular fresh water. Seedling growth at three different parameters such as height, collar diameter and number of leaves showed that with increasing temperature individuals respond negatively to increasing saline condition. The seedling's growth occurred at every day in height, collar diameter and leaf. However, growth rate reduced later during the observation. The combined effect of high salinity and higher elevated temperature results in seedling mortality. Therefore, Artocarpus chaplasha may not thrive at higher temperature and salinity intrusion at its early growing period in plantation and natural forest areas.

• 한국자원식물학회지
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• 제27권2호
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• pp.174-182
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• 2014

본 연구는 희귀식물 연화바위솔과 희귀특산식물 울릉연화바위솔의 종 보존을 위해 양질의 규격묘 생산방법을 구명하고자 토양종류와 광 조건이 규격묘 생산에 미치는 영향을 살펴보았다. 그 결과 연화바위솔과 울릉연화바위솔 모두 클라스만 토양에서 우수한 생육특성을 나타냈다. 광 조건에 따른 연화바위솔의 생육특성은 무차광 처리와 적색과 청색 LED 혼합처리조건에서 우수한 생육특성을 보였으며, 울릉연화바위솔은 LED 혼합처리조건과 50% 차광처리조건에서 우수한 생육특성을 나타냈다. 울릉연화바위솔은 기간이 경과함에 따라 마사토에서 생존율이 통계적으로 유의성 있게 감소하였다. 각각의 생육특성과 생존율간의 상관분석 결과 연화바위솔은 초장과 엽장, 지상부생체중 사이에 0.8 이상의 상관관계를 나타냈다. 울릉연화바위솔도 초장과 엽폭, 엽장 사이에 0.8 이상의 상관관계를 보였으며, 초장과 지상부 생체중 사이에 0.65 이상의 상관관계를 나타내 초장이 지상부 생육특성을 대표한다는 것을 알 수 있었다. 특히 연화바위솔과 울릉연화바위솔 모두 1차 측정 생존율과 2차 측정 생존율 사이에 0.8 이상의 상관관계를 보여 초기 유묘 초장과 생존율 관리가 양질의 규격묘 획득에 가장 높은 영향을 미치는 것으로 나타났다. 따라서 연화바위솔과 울릉연화바위솔을 3월 중순에 파종하여 30일 후 지상부 2 mm, 지하부 3 mm 이상 되는 유묘를 클라스만 상토가 충진된 72구 트레이에 이식하고 적색과 청색의 LED 혼합처리조건에 35일 간 육묘하면 초장과 근장이 각각 2.5~4 cm, 3~5 cm 이상 되고 엽수가 11매 이상 되는 규격묘를 생산할 수 있는 것으로 나타났다.

• 한국연초학회지
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• 제13권1호
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• pp.53-60
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• 1991

Seedling rot occurred on burley tobacco at the early growing stage after transplanting was surveyed in the Chonbuk province, the main area for burley tobacco production, during the 3 crop years from 1986. The incidence of disease was about 0.6-0.7% every year and major causal organisms were Pythium spp. More diseased plants were observed in the fields in which tobacco planted with improved mulching system than in that with any other mulching system. The temperature and relative humidity in the planting hole covered with polyethylene film for 11 days after transplanting were recorded by 27-45$^{\circ}C$ and 75~95%, respectively. The punched polyethylene film mulching field showed less diseased plants than that with improved mucking. In improved mulching system the longer period of mulching caused higher incidence of seedling rot(r=0.74**). Soil drench treatment of 200m1 of aqueous Metalaxyl Solution(125ppm) was effective to control the disease.

• 한국약용작물학회지
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• 제11권5호
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• pp.347-351
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• 2003

가시오갈피종자의 적정파종기를 구명하기 위하여 개갑종자의 저온처리기간에 따른 발아율을 조사하고 파종시기에 따른 묘목의 생존율과 생육정황을 조사하였다. 1. 채종하여 $15^{\circ}C$에서 140여일 간 모래로 층적저장한 종자는 냉장온도 $(5^{\circ}C)$에서 10일부터 발아하기 시작하여 85일까지 개갑종자는 93.7%, 비개갑종자는 26.1%가 발아하였다. 개갑종자와 비개갑종자 모두에서 85일 이후에 는 발아율의 증가가 둔화되었다 2. 유묘출현율, 생존율, 묘소질을 비교한 결과 5월 11일 이전에 저온에서 발아한 종자를 포트에 가식하는 것이 적정하였다. 3. 저온처리중 발아종자 길이 에 따른 생존율을 조사한 결과는 하배축이 $0.5{\sim}2$ cm 신장하였을 때 파종한 처리구의 생존율이 가장 높았다. 4. 발아종자의 생존율은 50%차광처리에서 30% 차광보다 10배 높게 나타났다. 5. 4월 10일과 5월 11일 사이에 파종하는 것이 묘의 생육에 가장 좋으며 적정 파종시기를 지나치더라도 적절한 관리대책만 따라가면 4월부터 8월까지 거의 모든 생육기간중에 발아종자 파종이 가능하였다.

• 한국환경과학회지
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• 제32권2호
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• pp.121-130
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• 2023

This study was conducted to investigate changes in seed vigor based on temperature of dry heat and duration treatment of watermelon seeds and examine the effect on percent of emergence and seedling vigor. When the upper limit temperature of dry heat treatment was raised to 80℃, the percent of the germination decreased. Moreover, T₅₀ was delayed as the upper limit temperature of dry heat treatment increased. The higher the upper limit temperature of dry heat treatment and the longer the treatment period, the higher the percentage of abnormal seedlings. The optimum upper limit temperature for dry heat treatment was 72℃, and the treatment period was five days. Seed vigor was better maintained at 30℃, 45℃, and 52℃, followed by stepwise exposure to high temperatures of 72℃, the upper limit of dry heat treatment, rather than dry heat treatment at a high temperature of 72℃ for 5 days from the initial stage of treatment. When the fungicide was added during the dry heat treatment process, the germination percentage decreased and the percent of the abnormal seedling percentage increased. However, the addition of 10 mg/kg fungicide did not significantly reduce seed vigor.

• 한국약용작물학회지
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• 제3권1호
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• pp.1-4
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• 1995

남부지장(南部地方)의 자소(紫蘇) 재배체계확립(栽培體系確立)을 위한 기초자료(基礎資料)를 얻고자 파종기(播種期)와 육모일수(育苗日數)를 달리하여 파종기(播種期)및 육모일수(育苗日數) 차이(差異)에 따른 생육(生育)과 수량(收量)을 검토(檢討)했던 바 다음과 같은 결과(結果)를 얻을 수 있었다. 1. 4월10일에 묘상(苗床) 파종(播種)하여 30일 육묘(育苗)한 구(區)의 개화기(開花期)는 8월12일로 4월20일에 묘상(苗床) 파종(播種)하여 30일 육묘(育苗)한 구(區)의 개화기(開花期) 8월14일 보다 2일이 빨랐고 4월 30일 묘상(苗床) 파종(播種)하여 30일 육묘(育苗)한 구(區)의 개화기(開花期) 8월18일 보다는 6일이 빨랐다. 2. 4월10일에 묘상(苗床) 파종(播種)하여 30일 육묘(育苗)한 구(區)의 경장(莖長)은 135cm로 4월20일 묘상(苗床) 파종(播種)하여 30일 육묘(育苗)한 구(區)의 경장(莖長) 131cm 보다 4cm가 더 길었으며 4월30일에 묘상(苗床) 파종(播種)하여 30일 육묘(育苗)한 구(區)의 경장(莖長) 125cm 보다는 10cm가 더 길었다. 3. 4월10일에 묘상(苗床) 파종(播種)하여 30일 육묘(育苗)한 구(區)의 분지수(分枝數)는 26.4개로서 4월20일 묘상(苗床) 파종(播種)하여 30일 육묘(育苗)한 구(區)의 분지수(分枝數) 25.3개 보다 1.1개 더 많았으며 4월30일 묘상(苗床) 파종(播種)하여 30일 육묘(育苗)한 구(區)의 분지수(分枝數) 23.6개보다는 2.8개가 더 많았다. 4. 4월10일에 묘상(苗床) 파종(播種)하여 30일 육묘(育苗)한 구(區)의 8월 중순(中旬)과 9월 상순(上旬)에 엽폭(葉幅) 5cm이상의 것만 수확(收穫)한 생경엽종(生莖葉重)은 2,476kg/10a로서 4월20일에 묘상(苗床) 파종(播種)하여 30일 육묘(育苗)한 구(區)의 생경엽종(生莖葉重) 2,304kg/10a 보다 172kg 증수(增收)였고 4월30일에 묘상(苗床) 파종(播種)하여 30일 육묘(育苗)한 구(區)의 생경엽종(生莖葉重 2,065kg/10a보다는 411kg이 더 증수(增收)되었다. 5. 4월10일에 묘상(苗床) 파종(播種_하여 30일 육묘(育苗)한 구(歷)의 생실종(生實重)은 609.5kg/10a로서 4월20일 묘상(苗床) 파종(播種)하여 30일 육묘(育苗)한 구(區)의 생실종(生實重) 509.3kg/10a보다 100.2kg 증수(增收)였고 4월30일 묘상(苗床) 파종(播種)하여 30일 육묘(育苗)한 구(區)의 생실종(生實重)의 463.2kg/10a보다는 146.3kg이 더 증수(增收)였다. 따라서 대일(對日) 수출용(輸出用) 자소생실(紫蘇生實)의 다수확(多收穫)을 위한 적정 묘상(苗床) 파종시기대(播種時期對) 육묘일수(育苗日數)는 4월10일 파종(播種)에 30일간(日間)의 육묘(育苗)였다

• 한국작물학회지
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• 제43권4호
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• pp.223-227
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• 1998

The objectives of this study were to find the sprouting condition and to establish the optimum production methods of plug seedlings in yacon (Polymnia sonchifolia Poepp. & Endl.). The sprouting ratio was greatest at $30\pm 1^{\circ}C$ at 20 days after planting. Crowns with single buds were more effective than those with two or more buds for sprouting, which might be due to the apical dominance. Planting the shoots separated from crown after sprouting in the single- and double-layer polyethylene-covered greenhouses reduced seedling period with 25% and 50%, respectively. Planting the shoots after sprouting was more effective than planting the crown buds. Double-layer polyethylene-covered green-house was good for plug seedling production than open field or single-layer polyethylene-covered greenhouse. The bed soils composed of clay loam : compost or sand : compost (1:l=v:v) were more effective to produce plug seedlings than only clay loam, sand or compost. Seedlings could be produced at 30 days after planting in our studies.