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Two new localities of orchids: Listera ovata and Dactylorhiza incarnata were found during the floristic investigations carried out in 1996 on the area of ecological uselands “Kopanina I” and “Kopanina II”, situated in the south-west part of Poznań. In the years 1997-1999 the changes of acreage and of population structure of both taxa were observed. Orchids grow in the conditions of strong anthropopressure, on the habitats of clearly secondary nature. However, the significant changes in the number and in the form of individuals were not noted.
Systematic, phenological observations over selected deciduous species of trees and shrubs have been carried out in the Dendrological Garden from 1995. Estimation of their development is based on the climatic factors and on the indicator plants for the individual phenological seasons. Observed species of the Celastraceae and Rosaceae families, derived from Eastern Asia are well adopted to our phenological seasons. Resistance to low temperature and drought, creation of natural renewal and full life-cycle during the vegetation confirm their adaptation to the climatic and site conditions of the Dendrological Garden.
The paper reports results of analysis of protein and eight enzymatic systems of three varieties of Helianthus annuus L. (Wielkopolski, Coril, and Frankasol) performed by three electrophoretic methods. Electrophoretic analyses allowed finding protein and isoenzymes markers for each of variety. The two interline hybrids Coril and Frankasol shared more features in common than the population variety Wielkopolski with each of the former. Mean values of the polymorphism index for the protein and the eight enzymes indicate that the variety Wielkopolski is more homogeneous than Coril and Frankasol.
The paper reports results of a morphological study of pollen grain of three varieties of Helianthus annuus: Wielkopolski population variety and two interline hybrids Frankasol and Coril. The viability of the pollen grain was also determined. No significant differences were found between the population variety and the two interline hybrids.
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