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Poszukiwanie zależności pomiędzy wybranymi cechami biometrycznymi bulw ziemniaka a promieniowaniem mikrofalowym

100%

Jakubowski T.

tom R. 12, nr 10(108)

73-79

W pracy poszukiwano zależności pomiędzy wybranymi cechami biometrycznymi bulw ziemniaka a promieniowaniem mikrofalowym. W doświadczeniu badano trzy bardzo wczesne odmiany ziemniaka: Felka Bona, Velox i Rosara. Dla wszystkich badanych odmian wartość wskaźnika spłaszczenia w próbach kontrolnych była większa od wartości uzyskanych w próbach poddanych działaniu pola mikrofalowego - wartość wskaźnika spłaszczenia w próbach kontrolnych odmiany Felka Bona była większa o 6,7%, w odmianie Velox 5% i 4,1% w odmianie Rosara. Statystycznie istotne różnice w zakresie uzyskanych wartości wskaźnika spłaszczenia bulw ziemniaka stwierdzono w bulwach ziemniaków odmiany Felka Bona.

The purpose of the work was to find dependencies between selected biometric characteristics of potato tubers and microwave radiation. Three very early potato varieties were examined during the experiment: Felka Bona, Velox and Rosara. For all examined varieties, the value of flattening index in check samples was higher than the values obtained for samples exposed to microwave field - the value of flattening index for Felka Bona variety check samples was 6.7% higher, for Velox variety - 5% higher, and for Rosara variety - 4.1% higher. Statistically significant differences in range of obtained potato tuber flattening index values were found for Felka Bona variety potato tubers.

Morphological and genetic diversity of Isopyrum thalictroides L. (Ranunculaceae) populations of isolated forest fragments of different sizes in East Central Poland

100%

Skrajna T. , Kubicka H. , Ługowska M.

tom Vol. 63, nr 1

23--37

Isopyrum thalictroides is classified as an indicator species of the socalled ‘old-growth forests’. It occurs in shady deciduous forests and is a characteristic species of the order Fagetalia silvaticae. In many parts of Europe and Poland, it is classified in Red Lists of endangered species with different threat levels. Studies of an occurrence of I. thalictroides were carried out in the years 2000–2002 and 2010–2012 to examine changes in the abundance and morphological and genetic diversity of populations inhabiting small mid-field forest fragments (populations 2–4) and a compact forest (1 population), all located in east central Poland. Isopyrum thalictroides cover declined drastically at all isolated sites (from 83 to 93%) whereas the whole species diversity of these phytocenoses increased. By contrast, in the compact forest both, the area occupied by I. thalictroides population and the total community composition only slightly changed over time. When I. thalictroides plants sampled from all studied sites were compared in terms of the biometrical characteristics, populations 3 and 4 were found to be most similar, population 1 was less similar and population 2 was the most different of all populations, probably due to strong anthropogenic pressure. Electrophoretic analysis of seed and leaf storage proteins of Isopyrum thalictroides obtained from the four sites demonstrated that the populations were quite similar genetically, no matter how distant they were from each another. Population 2 was the most diverse, followed by population 1 whereas populations 3 and 4 were the most similar. A decreasing genetic distance in the I. thalictroides population would lead to inbreeding as seed setting by the plants will be poorer and the seeds will be less viable, which will result in a lower number of plants per a given area. The decreased gene pool indicates that the population of I. thalictroides is threatened with extinction in this area. Therefore, it is warranted to undertake some conservation measures to protect the species; hence the need arises to monitor it.