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Ecological role of physical dormancy in seeds of Oxytropis racemosa in a semiarid sandland with unpredictable rainfall

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Journal of Plant Ecology 2018年第4期11卷 542-552页

作者： Dandan Hu Jerry M.Baskin Carol C.Baskin Xuejun Yang Zhenying Huang State Key Laboratory of Vegetation and Environmental Change Institute of BotanyChinese Academy of SciencesNo.20 NanxincunXiangshanHaidian DistrictBeijing 100093P.R.China University of Chinese Academy of Sciences No.19(A)Yuquan RoadShijingshan DistrictBeijing 100039P.R.China Department of Biology University of KentuckyLexingtonKY 40506USA Department of Plant and Soil Sciences University of KentuckyLexingtonKY 40546USA

Aims Seed dormancy and the soil seed bank are crucial to plant regeneration strategy,especially in semiarid ecosystems with unpredictable *** aim of this study was to investigate how seed dormancy is controlled by environmental factors and how it is correlated with the soil seed bank and regeneration of the perennial legume Oxytropis race-mosa,a dominant perennial herb in Mu Us Sandland of semiarid *** Germination and imbibition experiments on fresh intact and scarified seeds of *** were used to identify physical dormancy(PY)in seeds of this *** seed bank dynamics,timing of seedling emer-gence and the fate of buried seeds in the natural habitat were *** Findings PY was broken by mechanical scarification or wet heat/ice water cycles but not solely by dry heat or wet heat *** soil seed bank exhibited seasonal changes in the number of seeds,which was highest in September and lowest in *** buried at different sand depths gradually lost dormancy;20-42%of the seeds remained dormant after 20 months of *** break occurs grad-ually throughout the *** results indicate that *** exhibits hardcoatedness heterogeneity that spreads germination of a seed cohort between seasons and years in the semiarid environ-ment,where the amount of precipitation during the growing season is highly variable.

关键词： Oxytropis racemosa physical dormancy seedling emergence soil moisture soil seed bank soil temperature unpredictable rainfall

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Evolution of germination strategy in the invasive species Ulex europaeus

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Journal of Plant Ecology 2017年第2期10卷 375-385页

作者： Nathalie Udo Michèle Tarayre Anne Atlan Laboratoire ECOBIO UMR 6553CNRSUniversitéde Rennes 1Bâtiment 14ACampus de Beaulieu263 avenue du Général Leclerc35042 Rennes CedexFrance

Aims The study of the adaptive potential of the germination patterns of invading species enables us to identify some traits linked with their capacity to colonize new sites,and to gain a better understanding of their area of *** aim of this study is to determine the germination pattern of Ulex europaeus,a cosmopolitan invasive species,in relation to temperature and to explore its potential evolu-tion and invasiveness in a tropical region,following its introduction from *** We studied the germination pattern of ***(the com-mon gorse)to test both physical dormancy and germination capacity within the range of temperatures found in the native and invasive *** understand its germination pattern and its evolution,the rate and the speed of germination,as well as the percentage of seeds that became mouldy during the experi-ment,have been compared between a native habitat,France and a habitat into which it has been introduced,the tropical island of La *** Findings The results show that gorse seeds germinate in large quantities,pos-sess the ability to germinate under a wide range of temperatures and they confirm the physical dormancy of the seeds(caused by seed coat impermeability).The decrease in germination from 25℃ upwards,coupled with an increase in the rate of moulding help to explain its restricted distribution at altitude in tropical *** scari-fied seeds,we have not detected any difference between the two regions,neither in the percentage of germinated seeds,nor in the per-centage of mouldy ***,seeds from Reunion germinate faster at 20℃ than seeds from France and a greater number of seeds from Reunion are able to germinate without scarification(10-60%for Reunion versus 0-10%for France).These results suggest that while preserving the advantages of the native habitat,in Reunion gorse develops a strategy which favours the rapid occupation of new sites.

关键词： Ulex europaeus invasive species germination physical dormancy

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Overcoming seed dormancy of mooseer(Allium hirtifolium) through cold stratification,gibberellic acid,and acid scarification

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Journal of Forestry Research 2012年第4期23卷 707-710页

作者： Farshad Dashti Hojat Ghahremani-Majd Mahmood Esna-Ashari Department of Horticultural Sciences Faculty of AgricultureBu-Ali Sina UniversityHamedan ***Iran

Mooseer （Allium hirtifolium Boiss.） is bulbous perennial herb widely used in pharmaceutical and food industry in Iran. We studied germination of mooseer seeds in two separate experiments. In the first experiment, we evaluated four treatments： sulfuric acid scarification, sandpaper scarification, cold stratification, and gibberellic acid （GA3） application. In the second experiment, we evaluated combinations of these treatments. All treatments in the first experiment had no effect on seed germination, suggesting that mooseer seeds have physical and physiological dormancy. In the second experiment, the highest germina- tion percentage （86.6%） was observed after five minutes scarification with sulfuric acid （75% v/v）, followed by 60 days of cold stratification. Duration of sulfuric acid scarification （5, 10, and 20 min） did not affect germination rates, but increasing duration of cold stratification （from 15 to 60 days）, increased germination from 28.3% to 86.6%. Our study showed that mooseer seeds have both physical and physiological dormancy.

关键词： physical dormancy physiological dormancy germination sulfuric acid sand paper Allium hirtifolium

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