Wyniki wyszukiwania - Biblioteka Nauki

1

Radial variation of macrostructural parameters and density of wood in dominant trees of coniferous species

100%

Czajka M. , Fabisiak E.

Drewno : prace naukowe, doniesienia, komunikaty

|

2016

|

tom vol. 59, nr 197

179--187

EN

This paper presents the results of measurements of wood macrostructure parameters and wood density in dominant trees of Scots pine, Norway spruce, and European larch, originating from an even-aged stand, therefore growing on identical sites and in identical climatic conditions. The influence of the cambial age of annual rings and the cross-section area on the measured features was determined in this study. The measurements of macrostructural parameters were taken using an image analyser. Basic density was determined on samples containing three annual rings. In the analysed species the widths of annual rings demonstrated significant differences in the first 50 years of tree growth. The smallest widths of annual rings throughout the whole period of tree growth were observed in the case of spruce wood. The latewood share, analysed within 25-year increment zones, demonstrated statistically significant differentiation between tested species in all selected zones of the cross-section. For each of the tested species the lowest shares were observed for juvenile wood. The lowest density values were observed, therefore, in this zone. In the mature wood of larch and pine an approximate 20% increase in the density was observed and furthermore, all the way to the circumference, density showed slight fluctuations. In the case of spruce wood, the values of density within the analysed zone increased towards the circumference. Accordingly, larch wood and pine wood were characterised by greater uniformity of properties, compared to spruce wood. This observation has important practical implications, because density is a determinant of many properties that influence the technical quality of wood.

2

Modrzewie

86%

Falkowski G.

Zieleń Miejska

|

2021

|

tom Nr 9

38--42

PL

Modrzewie to najdalej sięgające na północ globu drzewa iglaste. Rosną w umiarkowanej i chłodnej (podbiegunowej) strefie półkuli północnej. Botanicy wyróżniają ok. 20 gatunków modrzewi, z czego połowę stanowią formy mieszańcowe, pojawiające się na obszarach o wspólnym zasięgu występowania dwóch lub więcej gatunków.

3

Immunocytochemical localization of rDNA and its newely formed transcripts in prophase nucleoli of meiocytes in larch Larix decidua Mill.

86%

Niedojadlo J. , Smolinski D. J. , Gorska-Brylass A.

Acta Biologica Cracoviensia. Series Botanica et Zoologia. Supplement

|

1997

|

tom 39

|

nr 1

4

Stanovenie priechodnosti mlatacky sisiek

86%

Piszczalka J. , Bajla J.

Prace Komisji Nauk Rolniczych. Polska Akademia Umiejętności

|

1998

|

tom 01

|

nr 2

5

Ovule, megaspores, and female gametophyte formation in Larix decidua Mill. [Pinaceae]

86%

Slobodnik B. , Guttenberger H.

Acta Biologica Cracoviensia. Series Botanica

|

2000

|

tom 42

|

nr 2

EN

Compared to the formation of male generative organs, the development of female sporogenous tissue of the European larch (Larix decidua Mill.) is considerably delayed. The young megaspore mother cell (megasporocyte, MMC) is not observable until late October, a short time before the period of dormancy. In early spring, MMCs become moderately enlarged, with intensive accumulation of starch grains around the nucleus. At the end of the first 10 days of March the MMCs become more rounded in section and the nucleus moves towards the basal part of the cell (near the chalaza). The integument and nucellus become observable at that time and chromosomal strands are visible in the MMC nuclei. Meiosis of MMCs was observed from mid-March to early April. During that period the tip of the integument grows gradually over the nucellus and creates the stigmatic apparatus of the ovule. Instead of the expected tetrads, triads of linearly arranged unequal megaspores were observed in individual ovules at the beginning of pollen shedding. Immediately after meiosis of the MMC, massive growth of the functional chalazal megaspore occurs, along with intensive free-nuclear divisions. The nuclei become located near the megaspore membrane, whereas the whole central part of the developing female gametophyte is filled with an extraordinarily large central vacuole. During intensive growth of the functional megaspore, the innermost layer of the nucellar tapetum gradually disintegrates. This development stage lasts until early May, when the megaspore membrane segregates partially from the nucellar tapetum and the free-nucleate female gametophyte assumes an irregular sac-like shape. The cellular stage of the female gametophyte with typical pyramidal cells at its micropylar end is visible at mid-May. Then the vacuolated (so-called frothy) archegonia gradually forms. The disappearance of vacuoles and the division of the central cell were registered in late May. At the stage of the large female gamete (egg cell) and the small ventral canal cell, the archegonia become fully receptive for fertilization. Our observations indicate that the development of the free-nucleate gametophyte and the formation of cell walls among the nuclei are the most sensitive phases of ovule development in the European larch before fertilization. During these stages, numerous cases of degeneration of the female gametophyte were observed, along with the complete deformation of ovules. The reasons for frequent irregularities are discussed here; the influence of meteorological and nutrient conditions seems especially important.

6

Poly(A) RNA as a new component of Cajal bodies in microsporocytes of larch

72%

Kolowerzo A. , Smolinski D. J. , Bednarska E.

Acta Biologica Cracoviensia. Series Botanica. Supplement

|

2008

|

tom 50

|

nr 1

7

Extracting Galactoglucomannans (GGMs) from Polish Softwood Varieties

72%

Kopania E. , Milczarek S. , Bloda A. , Wietecha J. , Wawro D.

Fibres & Textiles in Eastern Europe

|

2012

|

tom Vol. 20, no. 6B (96)

160--166

EN

The article presents a method of extracting galactoglucomannans from conifers: spruce and larch. Galactoglucomannans (GGMs) were extracted from shavings of Polish varieties of spruce and larch, using thermal and enzymatic treatment in an aqueous environment. The composition of the extracted GGMs (depending on the extraction method) was characterized by varied content of individual monosaccharides, i.e. glucose, galactose and mannose, as well as the average particle mass. The quantitative and qualitative composition of the extracted GGMs is an important factor affecting the possibility of their wide employment in modifying cellulose fibre-containing materials in order to improve their barrier qualities, and as biological agents in plant health products. GC/MS and SEC chromatographic tests and 13C NMR analysis made it possible to establish the composition and structural changes of the acquired GGMs.

PL

W artykule przedstawiono sposób wyodrębniania galaktoglukomannanów z drzew iglastych: świerku i modrzewia. Galaktoglukomannany (GGM) wyodrębniono z trocin drzewnych krajowych odmian świerku i modrzewia z zastosowaniem obróbki termicznej i enzymatycznej w środowisku wodnym. Wyodrębnione GGM (w zależności od metody wyodrębniania) charakteryzowały się zróżnicowanym składem pod względem zawartości poszczególnych cukrów prostych tj. glukozy, galaktozy i mannozy oraz wartością średniej masy cząsteczkowej. Skład ilościowy i jakościowy wyodrębnionych GGM jest istotnym elementem wpływającym na możliwość ich szerokiego zastosowania do modyfikacji materiałów zawierających włókna celulozowe w celu polepszenia ich właściwości barierowych oraz jako czynniki czynników biologicznych dla środków ochrony roślin. Badania z wykorzystaniem chromatografii GC/MS, SEC oraz analiza 13C NMR pozwoliły ocenić skład i zmiany strukturalne otrzymanych GGM.

8

Cytoplasmic RNPs-rich bodies in larch microsporogenesis

72%

Hyjek M. , Kolowerzo A. , Smolinski D.

Acta Biologica Cracoviensia. Series Botanica. Supplement

|

2014

|

tom 56

|

nr 1

9

Different categories of cytoplasmic "nucleoloids" in larch microsporocytes involved in pre-rRNA processing and pre-mRNA splicing

72%

Noble A. , Gorska-Brylass A.

Acta Biologica Cracoviensia. Series Botanica. Supplement

|

2005

|

tom 47

|

nr 1

10

Resistance of larches of Polish provenances to larch canker Lachnellula willkommii [Hartig.] Dennis under mountain conditions of the Sącz Beskid

72%

Kulej M.

Electronic Journal of Polish Agricultural Universities. Series: Forestry

|

2006

|

tom 09

|

nr 2

EN

This study is a fragment of a long-term research on a genetic-silvicultural value of larches of Polish provenances (Table 1, Fig. 1) tested under mountain conditions of the Sšcz Beskid range within the All-Polish Provenance Experiment of Larch 1967. Investigations were based on numerical data on the degree of infection of trees of analyzed partial larch populations with a pathogen Lachnellula willkommii (Hartig.) Denis during 1984 1999, i.e. when trees were 20, 25, 30, and 35 years old. Results showed a significant diversification of tested provenances in respect of resistance to larch canker, and a certain tendency of its decrease with age of trees (Tables 2 and 3). Provenances of various regions of Poland were in the group of populations most susceptible to this disease, i.e. with trees showing symptoms above the experimental average (Fig. 3). The resistance to larch cancer of individual partial populations, under mountain conditions of the study area situated in experimental forests of Krynica, was in the first place determined by the genotype (Fig. 4). While the evaluation of the effect of the interaction genotype (provenance) x years of observation (age) pointed to a high stability of resistance to canker of larch populations of extreme values of this trait (Fig. 5). This creates, especially in the case of this provenance group, the possibilities to conduct the effective resistance selection in the early stage.

11

Cytoplasmic nucleoloids in meiotic prophase of larch [Larix decidua Mill.]

72%

Parcinska A. , Smolinski D. J. , Gorska-Brylass A.

Acta Biologica Cracoviensia. Series Botanica et Zoologia. Supplement

|

1997

|

tom 39

|

nr 1

12

In situ inoculation of larch with the threatened wood-decay fungus Fomitopsis officinalis [Basidiomycota] - experimental studies

72%

Pietka J. , Grzywacz A.

Polish Botanical Journal

|

2005

|

tom 50

|

nr 2

13

The Dunkeld larch (Larix x marschlinsii Coaz) in Estonia

58%

Sander H. , Laanelaid A.

Dendrobiology

|

2007

|

tom 57

73-80

EN

It is commonly known that Japanese larch, Larix kaempferi was first introduced in Europe in Great Britain in 1861. In the presence of European larches, L. decidua it was not long before the first hybrids between these species, called Dunkeld larches (Larix × marschlinsii), emerged there. It was found that there were several hybrid larch trees in Estonia that sprouted before one of their parent species was introduced in Europe. One of the oldest Dunkeld larches growing in Tallinn is about 210 years old. The radial growth of three Dunkeld larches in Estonia (in the cities of Pärnu and Tallinn and in the manor park of Suure-Kambja) and the determination of their age by cumulative growth graphs are discussed, with consideration given to the available knowledge on the introduction of Japanese larch. The conclusion is that there may have existed earlier alternative introduction routes of Japanese larch into northern Europe via Russia.

14

Statistical characteristics of double bark thickness at breast height based on pine (Pinus sylvestris L.), larch (Larix decidua Mill.) and oak (Quercus robur L.)

58%

Kazmierczak K. , Pazdrowski W. , Szymanski M. , Nawrot M.

Colloquium Biometricum

|

2009

|

tom 39

15

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

58%

Girometta C. E. , Rovelli L. , Bracco F. , Brescia F. , Baiguera R. M. , Chiatante G. , Picco A. M. , Savino E.

Acta Mycologica

|

2021

|

tom 56

|

nr 1

16

Larix x marschlinsii Coaz 'Arrowhead', the new name for the cultivar previously described as 'Grot'

58%

Marczewski A.

Rocznik Polskiego Towarzystwa Dendrologicznego

|

2015

|

tom 63

17

Fungi antagonistic to Heterobasidion annosum [Fr.] Bref. in the rhizosphere of forest trees affected by industrial emissions

58%

Stepniewska H.

Phytopathologia Polonica

|

1992

|

tom 04

18

Somatic embryogenesis of selected coniferous tree species of the genera Picea, Abies and Larix

58%

Szczygiel K. , Hazubska-Przybyl T. , Bojarczuk K.

Acta Societatis Botanicorum Poloniae

|

2007

|

tom 76

|

nr 1

EN

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.

19

European larch [Larix decidua] and sweet chestnut [Castanea sativa] as host plants of spruce spider mites [Oligonychus ununguis Jacobi]

58%

Czajkowska B. , Puchalska E.

Biological Letters

|

2006

|

tom 43

|

nr 2

20

Stadial growth and its influence upon selected properties of European larch [Larix decidua Mill.] wood

58%

Splawa-Neyman S. , Pazdrowski W.

Folia Forestalia Polonica. Series B - Drzewnictwo

|

2000

|

tom 31