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Influences of seed source, Pre-chilling, Light and Temperature on the Germination of South African Pelargonium sidoides

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Journal of Agricultural Science and Technology 2010年第3期4卷 18-23页

作者： F. B. Lewu D. S. Grierson A. J. Afolayan Private Bag X 1001 Department of Agriculture University of Zululand Kwa-Dlangezwa 3886 South Africa Private Bag X 1314 Department of Botany University of Fort Hare Alice 5700 South Africa

Pelargonium sidoides DC is used in herbal medicine for the treatment of various infections. The roots are being indiscriminately harvested for local and export trade and the collection rate is becoming unsustainable. seed germination dynamics of this species was studied with the aim to reveal factors that influence its survival in the wild in order to adopt the appropriate germination conditions for use in ex-situ propagation and conservation program. Germination was affected by age of seeds, temperature and pre-chilling conditions. Temperature higher than 25 oC reduced germination by 60%. When seeds of P. sidoides were subjected to pre-chilling treatment for seven days, there was a significant drop in final germination by 29% compared to the other treatments. Although, final germination was not affected by different light treatments, continuous light significantly promoted germination velocity seeds harvested from the plants grown in the green house performed better in germination than those collected from the field. The ecological implications of these observations on the propagation and conservation ofP. sidoides are discussed.

关键词： seed source ex-situ conservation medicinal plant Pelargonium sidoides seed germination South Africa.

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Dynamics of Phaeocystis globosa bloom and implications for its seed sources in the Beibu Gulf,China

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Journal of Oceanology and Limnology 2022年第6期40卷 2385-2400页

作者： Zhuang NIU Weibing GUAN Jinxiu WANG Yongquan YUAN Fanzhou KONG Chao LIU Qingchun ZHANG Rencheng YU CAS Key Laboratory of Marine Ecology and Environmental Sciences Institute of OceanologyChinese Academy of SciencesQingdao 266071China Laboratory for Marine Ecology and Environmental Science Pilot National Laboratory for Marine Science and Technology(Qingdao)Qingdao 266237China State Key Laboratory of Satellite Ocean Environment Dynamics Second Institute of OceanographyMinistry of Natural ResourcesHangzhou 310012China School of Oceanography Shanghai Jiao Tong UniversityShanghai 200030China Center of Ocean Mega-Science Chinese Academy of SciencesQingdao 266071China University of Chinese Academy of Sciences Beijing 100049China

Algal blooms of haptophyte Phaeocystis globosa have been recorded in the Beibu Gulf,South China Sea(SCS)since *** evidence suggests that TypeⅠand TypeⅣare the two dominant genotypes of *** coexisting in this area,and their marker pigment profiles,colony sizes,and genetic information *** genotype-specific quantitative polymerase chain reaction(qPCR)assays were used to clarify the distribution and dynamics of *** bloom in the Beibu Gulffrom November 2018 to February *** show that the patterns of spatial-temporal distribution of TypeⅠand TypeⅣwere similar,the abundance of TypeⅣwas higher than that of TypeⅠduring the algal bloom,and thus TypeⅣcells dominated the *** bloom in winter *** relationships between environmental factors and *** abundance indicated that temperature and nitrate were critical to the distribution and dynamics of *** blooms in this *** distribution of *** cells in different water masses before the bloom revealed that the westward water via the Qiongzhou Strait,the SCS bottom water,and the current in the northwestern waters of Hainan Island could transport *** cells into the Beibu Gulf serving as the seed sources triggering the intense blooms in the Beibu Gulf.

关键词： Phaeocystis globosa harmful algal bloom(HAB) Beibu Gulf environmental factor seed source

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Symbiotic nitrogen fixation in black locust (Robinia pseudoacacia L.) seedlings from four seed sources

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Journal of Forestry Research 2011年第4期22卷 689-692页

作者： Alireza Moshki Norbert P. Lamersdorf Büsgen-Institut Soil Science of Temperate and Boreal Ecosystems Faculty of Forest Sciences and Forest Ecology University of Goettingen Büsgenweg 2 37077 Goettingen Germany

We conducted a greenhouse experiment to investigate the role of seed source in growth and symbiotic nitrogen fixation of black locust （Robinia pseudoacacia L）. seeds from different sources were planted in the same environmental conditions and inoculated with a suspension of mixed Rhizobium. We used the modified ^15N isotope dilution method to estimate biological nitrogen fixation of Robinia trees. Different Robinia seed sources differed significantly in terms of tissue dry weight （50.6-80.1 g）, total N （1.31-2.16 g） and proportion of nitrogen derived from the atmosphere （ 0-51%）. A higher nitrogen fixation rate of Robinia trees was associated with higher dry weight. Moreover, the leaves of Robinia proved to adequately represent the nitrogen fixation capacity of entire plants. Our results confirmed that assessment of seed sources is a useful way to improve the nitrogen fixation capacity and therefore the growth rate of Robinia.

关键词： Robinia pseudoacacia seed source ^15N dilution method symbiotic nilxogen fixation

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Dendroclimatic analysis of white pine (Pinus strobus L.)using long-term provenance test sites across eastern North America

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Forest Ecosystems 2018年第3期5卷 221-235页

作者： Sophan Chhin Ronald S.Zalesny Jr William C.Parker John Brissette Division of Forestry and Natural Resources West Virginia University322 Percival HallPO Box 6125MorgantownWV26506USA USDA Forest Service Northern Research Station5985Highway KRhinelanderWI 54501USA Ontario Forest Research Institute 1235Queen St.ESault Ste.MarieON P6A 2E5Canada USDA Forest Service Northern Research Station271Mast RoadDurhamNH 03824USA

Background: The main objective of this study was to examine the climatic sensitivity of the radial growth response of 13 eastern white pine(Pinus strobus L.) provenances planted at seven test sites throughout the northern part of the species’ native distribution in eastern North ***: The test sites(i.e., Wabeno, Wisconsin, USA; Manistique, Michigan, USA; Pine River, Michigan, USA; Newaygo,Michigan, USA; Turkey Point, Ontario, Canada; Ganaraska, Ontario, Canada; and Orono, Maine, USA) examined in this study were part of a range-wide white pine provenance trial established in the early 1960 s in the eastern United States and Canada. Principal components analysis(PCA) was used to examine the main modes of variation [first(PC1) and second(PC2) principal component axes] in the standardized radial growth indices of the provenances at each test *** year scores for PC1 and PC2 were examined in relation to an array of test site climate variables using multiple regression analysis to examine the commonality of growth response across all provenances to the climate of each test site. Provenance loadings on PC1 and PC2 were correlated with geographic parameters(i.e., latitude, longitude,elevation) and a suite of biophysical parameters associated with provenance origin ***: The amount of variation in radial growth explained by PC1 and PC2 ranged from 43.4% to 89.6%. Dendroclimatic models revealed that white pine radial growth responses to climate were complex and differed among sites. The key dendroclimatic relationships observed included sensitivity to high temperature in winter and summer, cold temperature in the spring and fal(i.e., beginning and end of the growing season), summer moisture stress, potential sensitivity to storminduced damage in spring and fal, and both positive and negative effects of higher winter snowfal. Separation of the loadings of provenances on principal component axes was mainly associated with temperature-related bioclima

关键词： Adaptation Climate change Dendrochronology seed source

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