• 한국잠사곤충학회지
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• 제39권1호
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• pp.1-11
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• 1997

In relations to cold acclimation, experiment was carried out to understand the seasonal changes in reserve substances of the mulberry. The shoot barks and leaves of three mulberry varieties(Kaeryangppong, Shinilppong and Yongcheonppong) were sampled, after that their reserve substances were analyzed. The cold hardiness of mulberry was investigated by DTA(Differential Thermal Analysis) method. To increase cold hardiness, gibberellin(100 ppm), kinetin(100 ppm) and Jambi 8 were sprayed on the mulberry leaves. After spraying, falling of the leaves of Yongcheonppong occured earier than the other varities. After the first frost, all of treatments except gibberellin were entirely fallen. Growth regulator extended the leaves fallen. After spraying, water of the shoot barks was not showed difference in the content among the treatments, but amino acid, carbohydrate and soluble protein increased from September to October. Starch content of the shoot barks and leaves was maximum in October, but thereafter decreased during wintering stage. In Shinilppong, Jambi 8 spray increased cold hardiness by 1-2$^{\circ}C$ more than no spray. It was concluded that the cold hardiness of the mulberry in midwinter is closely related to the reserve substances with spraying Jambi 8 on the mulberry leaves.

• 한국농림기상학회지
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• 제10권3호
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• pp.94-101
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• 2008

Warming trends during winter seasons in East Asian regions are expected to accelerate in the future according to the climate projection by the Inter-governmental Panel on Climate Change (IPCC). Warmer winters may affect short-term cold hardiness of deciduous fruit trees, and yet phenological observations are scant compared to long-term climate records in the regions. Dormancy depth, which can be estimated by daily temperature, is expected to serve as a reasonable proxy for physiological tolerance of flowering buds to low temperature in winter. In order to delineate the geographical pattern of short-term cold hardiness in grapevines, a selected dormancy depth model was parameterized for "Campbell Early", the major cultivar in South Korea. Gridded data sets of daily maximum and minimum temperature with a 270m cell spacing ("High Definition Digital Temperature Map", HDDTM) were prepared for the current climatological normal year (1971-2000) based on observations at the 56 Korea Meteorological Administration (KMA) stations and a geospatial interpolation scheme for correcting land surface effects (e.g., land use, topography, and site elevation). To generate relevant datasets for climatological normal years in the future, we combined a 25km-resolution, 2011-2100 temperature projection dataset covering South Korea (under the auspices of the IPCC-SRES A2 scenario) with the 1971-2000 HD-DTM. The dormancy depth model was run with the gridded datasets to estimate geographical pattern of change in the cold-hardiness period (the number of days between endo- and forced dormancy release) across South Korea for the normal years (1971-2000, 2011-2040, 2041-2070, and 2071-2100). Results showed that the cold-hardiness zone with 60 days or longer cold-tolerant period would diminish from 58% of the total land area of South Korea in 1971-2000 to 40% in 2011-2040, 14% in 2041-2070, and less than 3% in 2071-2100. This method can be applied to other deciduous fruit trees for delineating geographical shift of cold-hardiness zone under the projected climate change in the future, thereby providing valuable information for adaptation strategy in fruit industry.

• 한국잠사곤충학회지
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• 제36권1호
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• pp.1-7
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• 1994

용천뽕에 개량뽕을 교배하여 채종한 종자가 발아하는 생장점에 0.2% colchicine용액을 적하처리하여 4배성인 4원뽕 11호, 12호, 13호 및 14호를 창성하였으며 그 주요특성은 다음과 같다. 1. 이른봄의 발아개엽기는 개량뽕과 비슷한 중뽕이다. 2. 잎은 대형 또는 중형의 심장형이며 표면은 강강감이 있으며, 잎두께, 잎면적중, 수분율이 2배체에 비하여 증가 되었다. 3. 2배체인 교배모품종에 비하여 평균가지길이는 짧고 마디사이길이와 측지수는 두 모품종의 중간정도이었다. 4. 가지끝마름율은 1.6~2.5%로서 강한 내동성(cold hardiness)을 나타내고 있으므로 내동성이 강한 3배체 육성소재로 유망하다.

• 한국산림과학회지
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• 제48권1호
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• pp.25-28
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• 1980

본(本) 연구(硏究)는 떫은감 8품종(品種)과 단감 5품종(品種)에 대하여 1977~1978년(年) 겨울동안에 내한성(耐寒性)이 가장 약(弱)한 부위(部位), 동해(凍害)를 가장 많이 받는 시기(時期), 또한 단감과 떫은감 품종간(品種間)의 내한성(耐寒性)의 차이(差異)를 알고자 감나무 당년지(当年枝)의 동아(冬芽), 형성층(形成層), 재부유조직(材部柔組織), 부위별(部位別)로 77년(年)10월(月)26일(日), 78년(年) 1월(月)26일(日)과 3월(月)26일(日)에 시기별(時期別)로 내한성도(耐寒性度)가 측정(測定)되었다. 결과(結果)는 다음과 같다. 1. 한겨울과 초봄에 가장 내한성(耐寒性)이 약(弱)한 부위(部位)는 동아(冬芽)였다. 2. 동아(冬芽)의 내한성(耐寒性)을 기준(基準)으로 단감 품종(品種)들은 떫은감 품종(品種)들보다 내한성(耐寒性)이 낮았다. 형성층(形成層)이나 재부유조직(材部柔組織)의 내한성(耐寒性)에 있어서는 위 두 품종(品種)들 사이에 일정(一定)한 차이(差異)가 없었다. 3. 동아(冬芽)가 가장 피해(被害)을 받기 쉬운 시기(時期)는 만상(晩霜) 일어나는 초봄인 것으로 나타났다.

• 한국작물학회지
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• 제34권s02호
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• pp.96-114
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• 1989

There are several meterorolgical stresses in the winter cereal crops. Among these stresses, cold injury is one of the most important stresses for wheat and barley production in Korea. The reduction in grain yield of the wheat and barley due to cold injury has occurred almost every year in Korea. The objective of the study was to get the basic information in relation to the cold injury and to detect the method minimizing the damage of cold injury. When the air temperature was the ranges of -13$^{\circ}C$ to -15$^{\circ}C$, the soil temperature at the crown part of the plant was very stable, whereas in the ranges of -2$^{\circ}C$ to -3$^{\circ}C$ the soil surface temperature was more unstable and cold than air and subterranean temperatures. The different parts of the plant in wheat and barley possess the different levels of cold hardiness. In comparison to the cold hardiness of plant parts, the leaf and crown are the less sensitive to cold injury than root and vascular transitional zone. The type and extent of stress is determined by the redistribution pattern of water during freezing. These types from freezing processes were three types: a) Equilibrium freezing pattern b) Non -equilibrium freezing pattern, c) Non-equilibrium freezing pattern typical of tender tissues. Cold hardiness in wheat plants were more harder than barley plants at vegitative stage, but inverted at the reproductive stage. Injuries by low temperature during the seasons of barley cultivation in Korea were occured mainly in four stage; in the first and third stage, frost injury occurs, the second stage, freezing injury, and the fourth stage, chilling injury.

• 한국잠사학회:학술대회논문집
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• 한국잠사학회 2003년도 International Symposium of Silkworm/Insect Biotechnology and Annual Meeting of Korea Society of Sericultural Science
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• pp.43-45
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• 2003

This study was carried out to investigate sprouting and cold hardiness during wintering and thawing Periods in 7-year-old mulberry(Morus) three varieties of Kaeryangppong, Shinilppong and Yongcheonppong. The killing points of the mulberry twigs were investigated using DTA(Differential Thermal Analysis). (omitted)

• 한국산림과학회지
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• 제75권1호
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• pp.46-50
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• 1986

1983~'84년도(年度)의 겨울동안 1년생(年生) 리키테다 수형목(秀型木)의 풍매차대(風媒次代)들에 대(對)한 내한성(耐寒性) 선발(選拔)이 자연상태(自然狀態)에서 이루어졌다. 이때 생존(生存)한 개체(個體)들을 경기도(京畿道) 반월(半月), 충남(忠南) 대덕(大德), 경남(慶南) 양산(梁山) 지방(地方)에 식재(植栽)하고 2년후(年後)인 1985년(年) 가을에 3년생(年生) 수고(樹高)와 1986년(年) 봄에 동해상태(凍害狀態)를 조사(調査)하였다. 경기도(京畿道)에서는 동해피해율(凍害被害率)이 5.6%이고 충남(忠南)에서는 22.6%로 선발(選拔)을 안 거친 비교구(比較區) 9.3%, 43.3%보다 각각(各各) 실제동해피해율(實際凍害被害率) 3.7%와 20.7%, 백분율(百分率)로 환산(換算)해서 40.0%, 47.8%의 효과(効果)를 거두었다. 또한 1년생(年生) 때 동해피해율(凍害被害率)이 높았던 가계(家系)들이 3년생(年生) 때에도 역시 동해(凍害)를 많이 받는 것으로 나타났다. 3년생(年生) 수고(樹高)에서는 가계간(家系間) 차이(差異)가 없었고, 환경변이(環境變異)의 오차분산(誤差分散)이 지나치게 커 아주 낮은 유전력(遺傳力)($h{\fallingdotseq}0.04$)을 보였다.

• 한국농림기상학회지
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• 제25권4호
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• pp.359-367
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• 2023

포도는 국내뿐만 아니라 세계적으로도 중요도가 높은 과수 중 하나이다. 최근 기후변화에 따른 생물계절 단계의 변화와 이상저온 발생은 봄철 포도 신초 피해의 발생가능성을 높이고 있으며, 안정적인 포도 생산에 위협이 되고 있다. 본 연구는 저온에 의한 발아기부터 초기 전엽기까지의 생물계절단계별 신초의 피해 정도와 수체 내 당 함량의 관계를 알아보고, 우리나라 주요 품종인 '캠벨얼리', '거봉', '샤인머스켓' 품종의 전엽기 기준 내한성 비교를 위해 수행하였다. 포도 '캠벨얼리'의 생물계절단계별 LT₅₀ 추정을 통한 내한성 평가 결과, 발아기부터 4매 전엽기까지 생물계절단계가 진행될수록 내한성은 지속적으로 감소하였다. 각 기관별 당함량은 신초 정단, 화수, 줄기에서 마찬가지로 지속적인 감소가 두드러졌다. 따라서 신초의 내한성 감소는 당 함량에 기인한 것으로 생각되었다. 국내 주요 품종인 '캠벨얼리', '거봉', '샤인머스켓'의 전엽기 내한성 비교 결과, 전체 당 함량이 가장 높은 샤인머스켓이 가장 낮은 LT₅₀을 보여 가장 높은 내한성을 나타내었다. 그 다음으로는 '거봉', '캠벨얼리' 순이었다. 내한성은 품종마다 다르지만 이는 절대적이지 않으며 생물계절단계에 따라서도 변화하는 것으로 생각되었다.

• Journal of Plant Biology
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• 제26권1호
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• pp.33-39
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• 1983

Twigs bearing floral buds of Rhododendron yedoense var. poukhanense(Ryp) and R. sinmsii(Rs), hardy species in Korea, were used to investigate the cold hardiness in relation to the developmental and anatomical characteristics, and the changes of water content. In floral buds of both species, the reproductive organs, pistils and stamens, matured within the bud scales in early ctober to prepare for a cold acclimation. The ray parenchymatous areas occupied in xylem were 41% in Ryp and 38% Rs. As the storage temperature is raised from 2 to 17$^{\circ}C$, water content increased more highly in Rs than in Ryp. Exotherm temperature of floral bud in Ryp was generally lower than that in Rs. The result supports that the higher cold-hardiness is achieved owing to the earlier maturation of floral buds, to the larger area of ray parenchyma in xylem, and to the lesser increase of water content as the storage temperature is raised.

• 한국토양동물학회지
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• 제3권1호
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• pp.9-16
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• 1998

Effects of temperature, pH, and salt concentration on the preservation of the infective juvenile entolopathogenic nematodes, Steinernema carpocapsae, were analyzed. The effects of acclimation to sublethal low temperature and glycerol concentrations on rapid cold hardening of the nematodes were also evaluated to set up the conditions for their cryopreservation. All tested environmental factors could change the storage effectiveness of the nematodes. These analyses indicated that the optinal storage condition for the nematodes consisted of $15^{\circ}C$, pH 8.5, and 0.5-1.0% salt concentration. The nematodes showed a rapid could hardening in response to $5^{\circ}C$ for 2h. Glycerol induced the nematodes to increase the cold hardiness. Its high concentration over 10%, however, gave a harmful effect on the nematode survival.