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The coupled effect of light and temperature on dormancy release and germination of Pinus koraiensis seeds

Journal of Forestry Research 2022年第4期33卷 1135-1144页

作者： Min Zhang Jiaojun Zhu Institute of Applied Ecology Chinese Academy of SciencesShenyang 110016People’s Republic of China Qingyuan Forest CERN Chinese Academy of SciencesShenyang 110016People’s Republic of China

Elucidating the regulatory mechanisms of environmental factors on seed dormancy and germination will provide guidance for tree regeneration.Toward understanding the coupled effect of light and temperature on dormancy release and germination of Pinus koraiensis seeds,we set up three light conditions(L200:200μmol m^(-2) s^(-1),L20:20μmol m^(-2) s^(-1),L0:0μm^(-2) s^(-1))and four storage temperatures[T-5:-5°C(50 days),T5:-5°C(50 days)+5°C(50 days),T25:-5°C(50 days)+5°C(50 days)+25°C(50 days),T15:-5°C(50 days)+5°C(50 days)+25°C(50 days)+15°C(50 days)]using imbibed seeds,then quantified phytohormones gibberellic acid(GA_(3))and abscisic acid(ABA)during the stratification.germination percentage(G_(P)),mean germination time(T_(M)),and germination value(G_(V))under 25/15°C temperature and the three light conditions were then determined.Phytohormone levels and germination performances were significantly affected by light and temperature.No consistent trend was found between the phytohormone levels and G_(P) caused by light levels.Under the three light conditions,ABA concentrations in the embryo and endosperm decreased as storage temperature shifted from T-5 to T25 and increased from T25 to T15;GA_(3) decreased in nearly all four storage temperatures.G_(P) reached 40–60%in T25 storage without light irradiance.In the three light conditions,G_(P) and G_(V) were higher at T5 and T25 than at T-5 and T15;so T5 and T25 are considered as optimum storage temperatures for dormancy release and germination.At optimum temperatures,light(L200,L20)significantly increased the G_(P) and G_(V) compared with the dark(L0).At L200 and L20,significant negative correlations between G_(V) and the ABA concentrations and positive correlations between G_(V) and GA/ABA in the seed embryo were found.Temperature played a more important role in primary dormancy release and germination;light was unnecessary for primary dormancy release.Light facilitated seed germination at optimum temperatures.The dormancy release and germination of P.koraiensis seeds w

关键词： Seed germination Gibberellic acid Abscisic acid germination percentage Cold stratification Primary dormancy

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Effect of seed priming with different concentrations of potassium nitrate on the pattern of seed imbibition and germination of rice(Oryza sativa L.)

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Journal of Integrative Agriculture 2017年第3期16卷 605-613页

作者： Anisa Ruttanaruangboworn Wanchai Chanprasert Pitipong Tobunluepop Damrongvudhi Onwimol Department of Agronomy Faculty of Agriculture Kasetsart University Bangkok 10900 Thailand

Low germination and vigor of rice seed associated with dry-seed broadcasting are common problems encountered by rice growers.The objectives of this study were to evaluate the role of potassium nitrate（KNO3）on the pattern of seed imbibition and to determine the effect of seed priming with KNO3 on the germination percentage,speed and uniformity of germination in rice seed.Experiment 1 compared the patterns of seed imbibition of six concentrations of KNO3（0,0.25,0.50,1.00,1.50,and 2.00%）in two rice cultivars-KDML105 and RD15.The results showed that soaking rice seed in KNO3 at higher concentrations could delay the imbibition time.The higher concentrations of KNO3 delayed the imbibition time of rice seed and took a longer time to reach the end of phases 1 and 2 compared to the lower concentrations.The patterns of seed imbibition using distilled water of both rice cultivars（KDML105 and RD15）were quite similar,but with different concentrations of KNO3,the imbibition time taken to reach the end of phases 1 and 2 was slightly postponed in KDML105 suggesting that different rice cultivars may need different imbibition times for soaking seed in the priming process.Experiment 2 evaluated the effects of seed priming with 1.0 and 2.0%KNO3 at different imbibition times.It was found that priming with 1.0%KNO3 showed better seed germination than priming with 2.0%KNO3 and seed priming with 1.0%KNO3 at the imbibition time of early phase 2（or 28 h for KDML105）improved seed germination and increased both the speed and uniformity of seed germination.The results of this study show promise for the use of priming with 1.0%KNO3 soaked until early phase 2 of seed imbibition for improving the seed germination and vigor of rice in dry seed broadcasting.

关键词： rice water uptake seed priming KNO3 solution germination percentage speed of germination uniformity of germination

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Effect of Moisture Content on Melilotus suaveolens Seed Quality During Ultra-drying Storage

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Journal of Northeast Agricultural University(English Edition) 2011年第1期18卷 33-38页

作者： LIU Yan LIU Guangquan LI Qingmei DUAN Xinfang HOU Longyu Intemational Research and Training Center on Erosion ＆ Sedimentation Beijing 100048 China China Institute of Water Resources and Hydropower Research Beijing 100048 China Northwest Agriculture and Forestry University Yangling 712100 Shanxi China Research Institute of Forestry Chinese Academy of Forestry Beijing 100091 China Institute of New Forestry Technology Chinese Academy of Forestry Beijing 100091 China

In order to enhance the seed storability and supply high-quality seeds for vegetation restoration in the arid and semi-arid regions in Northwest China,the effects of ultra-drying and accelerated aging on the physiological characterstics of Melilotus suaveolens seeds were studied.Melilotus suaveolens seeds were dried in a desiccator containing silica gel to 80,53,42,33,23 and 16 g·kg-1 of moisture contents（MC）,respectively.The parameters of the seed quality including germination energy（GE）,germination percentage（GP）,relative conductivity（RC）,dehydrogenase activity（DA） and α-amylase activity（AA） were determined after ultra-drying and accelerated aging.The results showed that ultra-dried seeds with 42 g·kg-1 of MC showed the minimum changes of GE and GP before and after seed aging.Moreover,ultra-dry seeds with 42 g·kg-1 of MC showed higher DA and AA,and lower RC than non-ultra-drying seeds.Therefore,ultra-drying to 42 g·kg-1 of MC was helpful for M.suaveolens seed storage.

关键词： ultra-drying germination percentage dehydrogenase activity a-amylase activity M. suaveolens seed storage

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Study of Ultra-drying on Vigor and Physiological Characteristics of Lespedeza bicolor Seeds

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Chinese Forestry Science and Technology 2010年第2期9卷 56-61页

作者： LIU Yan1 LIU Guangquan1,2,3 LI Qingmei4 DUAN Xinfang5 HOU Longyu1 1. International Research and Training Center on Erosion & Sedimentation, Beijing 100048, P.R. China 2. China Institute of Water Resources and Hydropower Research, Beijing 100048, P.R. China 3. Northwest Agricultural and Forestry University, Yangling 712100, P.R. China 4. Research Institute of Forestry, Chinese Academy of Forestry, Beijing 100091, P.R. China 5. Institute of New Forestry Technology, Chinese Academy of Forestry, Beijing 100091, P.R. China

Ultra-drying (in a desiccator with silica gel) and accelerated aging (50 oC, 30 d) of Lespedeza bicolor seeds from the arid and semiarid areas of northwest China were studied. The results showed that in the moisture content of seed ( 43?70 g/kg), germination percentage and vigor indices had no significant differences; ultra-dried seeds had a stronger anti-aging ability than those with natural drying, and the best MC for the storage was 43 g/kg. Therefore, it was feasible to store L. bicolor seeds with ultra-dried moisture content.

关键词： ultra-drying germination percentage vigor index relative conductivity enzyme activity Lespedeza bicolor

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段强副市长视察农普工作

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数据 1996年第4期

段强副市长视察农普工作［本刊讯］在市统计局副局长、市农普办主任庄宝国、朝阳区农业普查领导小组组长、区长助理马广田，区统计局局长、农普办主任袁明珠陪同下，副市长、市农业普查协调联系会议组长段强同志３月１８日下午来到朝阳... 详细信息

段强副市长视察农普工作［本刊讯］在市统计局副局长、市农普办主任庄宝国、朝阳区农业普查领导小组组长、区长助理马广田，区统计局局长、农普办主任袁明珠陪同下，副市长、市农业普查协调联系会议组长段强同志３月１８日下午来到朝阳区金盏乡，亲临普查现场，检查指导调...

关键词： magnetized water germination percentage atomic absorption spectrum

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