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Full-Text Articles in Life Sciences
The Role Of Anthropogenic Habitats As Substitutes For Natural Habitats: A Case Study On Epipactis Helleborine (L.) Crantz (Orchidaceae, Neottieae). Variations In Size And Nutrient Composition Of Seeds, Agnieszka Rewicz, Jeremi Kolodziejek, Anna Jakubska-Busse
The Role Of Anthropogenic Habitats As Substitutes For Natural Habitats: A Case Study On Epipactis Helleborine (L.) Crantz (Orchidaceae, Neottieae). Variations In Size And Nutrient Composition Of Seeds, Agnieszka Rewicz, Jeremi Kolodziejek, Anna Jakubska-Busse
Turkish Journal of Botany
Natural and anthropogenic habitats differed greatly in terms of soil nutrients. Soil at the anthropogenic sites contained significantly lower concentrations of nitrogen (N) than those at the natural sites. Seeds of Epipactis helleborine were sampled from these two contrasting growth habitats and their size and nutrient composition were recorded. The 8 populations of E. Helleborine were different in seed and embryo volumes, but there were no significant differences in seed width. Habitat type significantly influenced seed area: in the anthropogenic areas, seed area was greater than in the natural areas. Two distinct groups of populations were evident with regard to …
Strategies For Conserving Forest Genetic Resources In The Face Of Climate Change, John Bradley St.Clair, Glenn Thomas Howe
Strategies For Conserving Forest Genetic Resources In The Face Of Climate Change, John Bradley St.Clair, Glenn Thomas Howe
Turkish Journal of Botany
Conservation of genetic diversity is important for continued evolution of populations to new environments, as well as continued availability of traits of interest in genetic improvement programs. Rapidly changing climates present new threats to the conservation of forest genetic resources. We can no longer assume that in situ reserves will continue to preserve existing genetic diversity. Management of reserves should become more active. In some reserves, existing genetic diversity should be preserved by creating stands that are more resistant to threats using silvicultural treatments such as thinning and prescribed burning. In other reserves, natural selection and adaptation to changed environments …
Phylogenetic Relationships Of Monocots Based On The Highly Informative Plastid Gene Ndhf, Thomas J. Givnish, J. Chris Pires, Sean W. Graham, Marc A. Mcpherson, Linda M. Prince, Thomas B. Patterson, Hardeep S. Rai, Eric H. Roalson, Timothy M. Evans, William J. Hahn, Kendra C. Millam, Alan W. Meerow, Mia Molvray, Paul J. Kores, Heath W. O'Brien, Jocelyn C. Hall, W. John Kress, Kenneth J. Sytsma
Phylogenetic Relationships Of Monocots Based On The Highly Informative Plastid Gene Ndhf, Thomas J. Givnish, J. Chris Pires, Sean W. Graham, Marc A. Mcpherson, Linda M. Prince, Thomas B. Patterson, Hardeep S. Rai, Eric H. Roalson, Timothy M. Evans, William J. Hahn, Kendra C. Millam, Alan W. Meerow, Mia Molvray, Paul J. Kores, Heath W. O'Brien, Jocelyn C. Hall, W. John Kress, Kenneth J. Sytsma
Aliso: A Journal of Systematic and Floristic Botany
We used ndhF sequence variation to reconstruct relationships across 282 taxa representing 78 monocot families and all 12 orders. The resulting tree is highly resolved and places commelinids sister to Asparagales, with both sister to Liliales—Pandanales in the strict consensus; Pandanales are sister to Dioscoreales in the bootstrap majority-rule tree, just above Petrosaviales. Acorales are sister to all other monocots, with Alismatales sister to all but Acorales. Relationships among the four major clades of commelinids remain unresolved. Relationships within orders are consistent with those based on rbcL, alone or in combination with atpB and 18S nrDNA, and …
Evaluation Of Chilling Requirements For Six Arkansas Blackberry Cultivars Utilizing Stem Cuttings, Dayanee Yazzetti, John R. Clark
Evaluation Of Chilling Requirements For Six Arkansas Blackberry Cultivars Utilizing Stem Cuttings, Dayanee Yazzetti, John R. Clark
Discovery, The Student Journal of Dale Bumpers College of Agricultural, Food and Life Sciences
Woody perennial plants including blackberries (Rubus subgenus Rubus) require certain amounts of chilling or rest hours below 7ºC during the dormant season for successful bud break the following year. Arkansas-developed blackberry cultivars are being grown in various climates worldwide and all cultivars need chilling requirement estimates for accurate recommendations of adaptation. Determining chilling requirement using stem cuttings collected from field-grown plants rather than whole plants is a desirable system. We conducted a study to evaluate both artificial and field chilling of six cultivars. For the artificial-chilling study, 12- node stem cuttings were collected 2 days after the first killing frost. …