Wyniki wyszukiwania

1

On the specific pattern of long chain polyprenols in green needles of Pinus mugo Turra

100%

Kazimierczak B., Hertel J., Swiezewska E., Chojnacki T., Marczewski A.

Acta Biochimica Polonica

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1997

|

tom 44

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nr 4

In green needles of Pinus mugo the most abundant polyprenols occur as a mixture of prenologues in which the dominant alcohol is built of 16 isoprene units. The characteristic spectrum of polyprenols (prenol-15, -16 and -17) was the same irrespective of the location of plant and of distinct morphological differences observed in the various selected forms of this species. The constant pattern of the polyprenols spectrum was preserved throughout the 2-year life span of needles, although the level of polyprenols was increased 2-3-fold. The polyprenol pattern in Pinaceae family differs from species to species, thus it may serve as chemotaxonomic criterion within this systematic group.

2

Cone cluster form of Pinus uncinata Ramond [Pinaceae]

100%

Boratynski A., Didukh J. P., Tomaszewski D.

Rocznik Dendrologiczny

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2000

|

tom 48

3

Hodowla jodly w Bieszczadach

86%

Dynur W.

Aura

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1994

|

nr 02

15-16

4

Ocena wielkosci samozaplodnienia u modrzewia polskiego

86%

Lewandowski A.

Arboretum Kórnickie

|

1993

|

tom 38

35-41

5

Wystepowanie guzowatej formy sosny zwyczajnej Pinus sylvestris L.f.gibberosa Kihlman w zachodniej czesci Polski

86%

Danielewicz W.

Przegląd Przyrodniczy

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1993

|

tom 04

|

nr 2

63-66

6

Nowa, krotkoigielna forma swierka kaukaskiego [Picea orientalis [L.]Link]

86%

Filipiak M.

Rocznik Dendrologiczny

|

1992

|

tom 40

109-110

7

Problemy ochrony lokalnych populacji modrzewi w rezerwatach lesnych Wielkopolski

86%

Malinski T.

Przegląd Przyrodniczy

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1993

|

tom 04

|

nr 3

79-90

8

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

86%

Slobodnik B., Guttenberger H.

Acta Biologica Cracoviensia. Series Botanica

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2000

|

tom 42

|

nr 2

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.

9

Generative propagation of Pinus sylvestris L. in heavy polluted environment

81%

Palowski B.

Acta Biologica Silesiana

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1994

|

tom 26

29-39

10

Morfologiczne zroznicowanie szyszek kilku gatunkow Picea z Europy i Azji

72%

Staszkiewicz J.

Wiadomości Botaniczne

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1993

|

tom 37

|

nr 3-4

11-12

11

Variability of the cones of Larix olgensis [Pinaceae} in the massif of Paekdu-san in North Korea

72%

Staszkiewicz J.

Fragmenta Floristica et Geobotanica

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1992

|

tom 37

|

nr 2

487-497

12

Rozmieszczenie miejsc uprawy limby [Pinus cembra l.] w Polsce

72%

Danielewicz W., Wronska-Pilarek D.

Komunikaty Dendrologiczne

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1993

|

tom 22

3-36

13

Endogenous oscillations of elektric potential difference in the cambial region of the pine stem.II. Possible involvement of the oscillations in xylogenesis

72%

Kurek W.

Acta Societatis Botanicorum Poloniae

|

1992

|

tom 61

|

nr 2

221-230

14

Changes in phenolic compounds content in needles of Scots pine [Pinus sylvestris L.] seedlings following short term exposition to sulphur dioxide

72%

Gietrych M. J., Karolewski P.

Arboretum Kórnickie

|

1993

|

tom 38

43-51

15

Grzyby igiel i korzeni sosen zywicowanych i niezywicowanych

72%

Chojnacki B.

Arboretum Kórnickie

|

1992

|

tom 37

125-133

16

Fatty acid and tocochromanol patterns of Turkish pines

72%

Bagci E., Karaagacli Y.

Acta Biologica Cracoviensia. Series Botanica

|

2004

|

tom 46

95-100

The plant family Pinaceae is known to produce a set of unusual fatty acids in the seed oils. In Turkey it has been less studied in respect to the fatty acid and tocochromanol (tocopherols and tocotrienols) composition of the seed oils, particularly in terms of chemotaxonomy. This study examined the fatty acid, tocopherol, tocotrienol and plastochromanol-8 content of Pinus L. taxa naturally growing in Turkey (Pinus nigra subsp. pallasiana, P. nigra subsp. pallasiana var. pyramidata, P. halepensis, P. sylvestris, P. pinea, P. brutia, P. radiata, P. pinaster). The fatty acids (oleic, linoleic, α-linolenic, ∆5-taxoleic, pinolenic and coniferonic acid) and tocochromanols are valuable components of Pinus seed oils, in the family Pinaceae. Unsaturated fatty acid comprises ~90% of the seed oil. While γ-tocopherol was found to be the largest component of all Pinus seed oil, β-tocotrienol was not found at all. Total tocopherols in the studied taxa was much higher than total tocotrienols. The distribution of fatty acid and tocochromanol patterns in the genus Pinus is discussed, and in particular the presence of ∆5-UPIFA acids such as taxoleic and pinolenic acids, as well as common and distinguishing features that may contribute to knowledge about the taxonomy and phylogeny of pines.

17

Endogenous oscillations of electric potential difference in the cambial region of the pine stem. I.General characteristics of the oscillations

72%

Kurek W.

Acta Societatis Botanicorum Poloniae

|

1992

|

tom 61

|

nr 2

211-220

18

Zwisajace formy swierka [Picea abies Karst.'Pendula'] w naturalnych zbiorowiskach nizinnych jedlin

72%

Zareba R.

Rocznik Dendrologiczny

|

1992

|

tom 40

93-96

19

Pathological anatomy of thin woody roots of Scots pine invaded by Heterobasidion annosum [Fr.] Bref.

72%

Werner A.

Arboretum Kórnickie

|

1993

|

tom 38

113-129

20

Stan zachowania i zagrozenia lasow cedrowych w Maroku

72%

Cabala S., Orczewska A., Wika S.

Chrońmy Przyrodę Ojczystą

|

1995

|

tom 51

|

nr 4

101-103

Ograniczanie wyników

On the specific pattern of long chain polyprenols in green needles of Pinus mugo Turra

Cone cluster form of Pinus uncinata Ramond [Pinaceae]

Hodowla jodly w Bieszczadach

Ocena wielkosci samozaplodnienia u modrzewia polskiego

Wystepowanie guzowatej formy sosny zwyczajnej Pinus sylvestris L.f.gibberosa Kihlman w zachodniej czesci Polski

Nowa, krotkoigielna forma swierka kaukaskiego [Picea orientalis [L.]Link]

Problemy ochrony lokalnych populacji modrzewi w rezerwatach lesnych Wielkopolski

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

Generative propagation of Pinus sylvestris L. in heavy polluted environment

Morfologiczne zroznicowanie szyszek kilku gatunkow Picea z Europy i Azji

Variability of the cones of Larix olgensis [Pinaceae} in the massif of Paekdu-san in North Korea

Rozmieszczenie miejsc uprawy limby [Pinus cembra l.] w Polsce

Endogenous oscillations of elektric potential difference in the cambial region of the pine stem.II. Possible involvement of the oscillations in xylogenesis

Changes in phenolic compounds content in needles of Scots pine [Pinus sylvestris L.] seedlings following short term exposition to sulphur dioxide

Grzyby igiel i korzeni sosen zywicowanych i niezywicowanych

Fatty acid and tocochromanol patterns of Turkish pines