Temat: larix - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Aberrant phyllotactic patterns in cones of some conifers: a quantitative study
Autorzy:: Fierz, V.
Powiązania:: https://bibliotekanauki.pl/articles/56470.pdf
Data publikacji:: 2015
Wydawca:: Polskie Towarzystwo Botaniczne
Tematy:: phyllotactic diversity
phyllotaxis
Pinus nigra
Larix decidua
cone
conifer
quantitative study
Opis:: The scale patterns of 6000 cones from one single tree of Pinus nigra Arn. have been examined. Apart from the main Fibonacci pattern with 8 and 13 parastichies, nine aberrant spiral patterns with Fibonacci-type sequences have been found. They are quite rare and occur with different frequencies. The parastichy quotient 8/13 of the prevalent pattern is very close to the golden ratio 0.618. In case of the black pine it appeared that the greater the deviation of the parastichy quotient m/n from 0.618, the rarer the pattern. Similar results obtained for the sample of 1506 cones collected from three individual trees of larch (Larix decidua Mill.) suggest a true correlation between the frequency of a pattern and the deviation of its parastichy quotient from the golden ratio.
Źródło:: Acta Societatis Botanicorum Poloniae; 2015, 84, 2
0001-6977
2083-9480
Pojawia się w:: Acta Societatis Botanicorum Poloniae
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Somatic embryogenesis of selected coniferous tree species of the genera Picea, Abies and Larix
Autorzy:: Szczygiel, K
Hazubska-Przybyl, T.
Bojarczuk, K.
Powiązania:: https://bibliotekanauki.pl/articles/57833.pdf
Data publikacji:: 2007
Wydawca:: Polskie Towarzystwo Botaniczne
Tematy:: Abies
micropropagation
ex vitro
development
larch
tree species
spruce
in vitro
botany
Picea
medium
embryogenesis
Larix
fir
hormone
Opis:: Experiments on somatic embryogenesis in selected spruce, fir and larch species were performed to determine if this method of micropropagation enables production of quality seedlings for forest nurseries. High frequencies of embryogenic callus in spruce (23-31%) and fir (29%) were achieved when mature zygotic embryos were used as explants, while in larches (36%) only when megagametophytes (endosperms with immature embryos) were used. The possibility of somatic embryogenesis initiation also from somatic embryos (resulting in secondary and third generation of embryogenic callus) indicate high efficiency of this method of micropropagation. The best results at all stages of somatic embryogenesis (good proliferation of embryogenic callus, high rate of embryo regeneration and their survival) were obtained for Norway spruce, European larch and some hybrid larches.
Źródło:: Acta Societatis Botanicorum Poloniae; 2007, 76, 1
0001-6977
2083-9480
Pojawia się w:: Acta Societatis Botanicorum Poloniae
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: The medicinal wood-decay species Laricifomes officinalis in the Alpe Veglia–Alpe Devero Natural Park (Italian Alps): spatial analysis and growth tests of pure cultures
Autorzy:: Girometta, Carolina Elena
Rovelli, Laura
Bracco, Francesco
Brescia, Francesca
Baiguera, Rebecca Michela
Chiatante, Gianpasquale
Picco, Anna Maria
Savino, Elena
Powiązania:: https://bibliotekanauki.pl/articles/11543426.pdf
Data publikacji:: 2021
Wydawca:: Polskie Towarzystwo Botaniczne
Tematy:: wood decay fungi
Laricifomes officinalis
Larix decidua
biodiversity conservation
larch
spatial analysis
growth test
pure culture
natural park
Alps Mountains
Italy
Opis:: Laricifomes officinalis is a wood-decay fungus that is closely associated with old individuals of Larix decidua. In the twentieth century, L. officinalis was over-harvested because of its medicinal properties; consequently, it has become very rare or almost extinct in the Alps. In this study, we investigated the population of L. officinalis in the Alpe Veglia–Alpe Devero Natural Park (Val d’Ossola, Italy) to assess a preliminary conservation strategy. Population consistency was estimated using field mapping, and spatial analysis was performed on host trees based on topographical and environmental variables. Mycelia were isolated from harvested basidiomata, and strain identity confirmed by molecular analysis of the ITS region. All isolated strains were tested for growth in Petri dishes containing different standard media to determine which strains had the highest growth rates; the fastest growing strains may be selected for future studies and applications. Compared to the control strains from Val Malenco and Parco Nazionale del Gran Paradiso, all strains from Alpe Veglia–Alpe Devero Natural Park had lower growth rates. There was no significant difference between the growth rates of strains from Alpe Veglia and those from Alpe Devero. The results suggest that the population consistency of L. officinalis in the Alpe Veglia–Alpe Devero Natural Park is related to two main factors: habitat preservation and harvesting prohibition. These results confirm the need to protect L. officinalis both inside and outside natural reserves, despite the apparent increase in local populations.
Źródło:: Acta Mycologica; 2021, 56, 1; 569
0001-625X
2353-074X
Pojawia się w:: Acta Mycologica
Dostawca treści:: Biblioteka Nauki

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