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Differentiation of Seed Germination and early seedling growth in Ten Provenances of Eucalyptus Microtheca

Journal of Forestry Research 1997年第1期8卷 13-19页

作者： KariTuomela UniversityofHelsinki DepartmentofForestEcology/TropicalSilviculture'P.O.Box28(ViikinKoetila20)FIN-00014UniversityofHelsinkiFINLAND

An investigation of seed germination and early seedling growth of Eucalyptus microtheca was based onseed collection from 10 widely,separated provenanes in Australia. Genetic variation of seed germination and carly seedling growth was observed among a series of provcnances whose natural habitats range from different climatic condition Inthe ten provenances, both the model of seed relative germination percentage and the model of seed total germination percentage fitted Logistic regression [y=a/(1+exp(-cx+b))]. In comparison with provenanccs from four high temperature (meanannual maximum temperature >30.0 ℃: mean annual minimum temperature > 17.0 ℃) areas, six low temperature (meanannual maximum temperature seedlings equally divided into three watering levels (100%, 50%. and 25% of field capacity), and studies on relationship between early seedling growth and climaticfactors of the natural habitat of provenance. In control treatment. height growth of the seedling has beeb associated with intrinsically the driest quarter precipitation in the seed collection areas of provenance. In all the treatments, length growth ofthe biggest Ieaf of the seedling was related to mean annual maximum temperature and mean annual minimum temperaturein origin of provenance. In contrast, basal diameter growth of the seedling was related to mean annual minimum temperature of the seed collection areas in water stress treatment. From an ecological viewpint, the fast germination rate and thehigh total germination perecntage of the seed and rapid early grouth of the seedling appear to bc favourable adaptations tothe climatic conditions prevailing in the natural habitat of provenance.

关键词： early seedling growth Eucalyptus microtheca Provenance variation Seed germination

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Pre-sowing treatments for improved germination and growth of two rare native species of Bangladesh

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Journal of Forestry Research 2018年第5期29卷 1277-1282页

作者： M.A.Hossain K.S.Islam N.Rajasree M.K.Hossain M.S.Alam Institute of Forestry and Environmental Sciences University of Chittagong

Pre-sowing treatments are expected to increase seed *** evaluates response to pre-sowing treatments and the growth performance of two native and rare tree species,Garuga pinnata *** Vitex glabrata *** hard seed coats were treated by rubbing with sand paper,nail clipping,and immersion in water and acid（H_2SO_4）.Results indicate that *** showed a 90% germination rate and 30% germination energy when seed coats were nicked with a nail *** with sand paper was the best pre-sowing treatment for ***,resulting a 80% germination rate and 30% germination *** and *** seedlings from seeds soaked 24h in water resulted in maximum heights and collar *** were significantly higher（at p〈0.05） than those of other *** results indicate that scarification or nicking of seeds may have some negative impacts on seedling ***,it is difficult to recommend a pre-sowing treatment of seeds for achieving both maximum germination and good early seedling growth.

关键词： Germination early seedling growth Height Native species Garuga pinnata Vitex glabrata

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Allelopathic Effects of Cedrus deodara Needle Extracts on Seed Germination and early growth of Three Turfgrasses

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Agricultural Biotechnology 2022年第1期11卷 22-27,31页

作者： Menghong HU Xun LYU Man SUN Baoquan ZHANG Yuan LIU Gansu Xiaolongshan Forest Ecosystem National Positioning Observation and Research Station Gansu Key Laboratory of Secondary Forest CultivationGansu Xiaolongshan Forestry Research InstituteTianshui 741022China College of forestry Gansu Agricultural UniversityLanzhou 730070China

[Objectives]This study was conducted to provide reference for plant landscaping,optimization of planting structure and rational allocation of species in Cedrus deodara gardens.[Methods]With three common garden plants in northern China,Trifolium repens L.,Poa pratensis *** Trifolium pratense L.,as receptors,the effects of four concentrations(0.025,0.05,0.075 and 0.10 g/ml)of *** needle extract on seed germination and early seedling growth of the three turfgrasses were studied by the Petri dish filter paper method,using a clear water treatment(0 g/ml)as control check(CK).Data were subjected to analysis of variance(ANOVA)and multiple comparisons(Duncan)using SPSS16.0.[Results]Different concentrations of *** needle extract had significant inhibitory effects on seed germination,radicle and seedling height growth of ***,*** and ***(Pseedling growth of *** stopped,and radicle and seedling growth of *** and *** also *** the concentration was equal to 0.10 g/ml,germination of *** and *** seeds was inhibited,and the absolute values of allelopathic index was the largest,that is,the inhibitory effects were the *** with the increase of concentration,the absolute value of synthetical allelopathic index also *** extract of *** needles contained main allelochemicals leading to the scarcity of understory vegetation.[Conclusions]This study provides a theoretical basis for reasonable garden plant configuration during *** greening and garden landscaping.

关键词： Cedrus deodara L. Needle extract Seed germination early seedling growth Allelopathic effect

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