Wyniki wyszukiwania

1

The mode of ray initiation affects the rate of double storied pattern formation in cambium

100%

Myskow E.

Polish Journal of Natural Sciences. Supplement

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2003

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tom 01

2

Interlocked grain as an ecological advantage in large emergents and canopy trees

86%

Kojs P., Wloch W., Rusin A., Rusin T.

Polish Journal of Natural Sciences. Supplement

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2003

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tom 01

3

Symplasmic isolation in cambium and phloem cells and its seasonal variation

86%

Masztalerz K.

Polish Journal of Natural Sciences. Supplement

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2003

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tom 01

4

Participation of intrusive growth between periclinal walls in formation of storied structure of Wisteria floribunda DC. cambium

86%

Jura J., Wloch W.

Polish Journal of Natural Sciences. Supplement

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2003

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tom 01

5

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Ontogenetic development of storied ray pattern in cambium of Hippophae rhamnoides L.

86%

Myskow E., Zagorska-Marek B.

Acta Societatis Botanicorum Poloniae

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2004

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tom 73

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nr 2

Storied pattern, in the arrangement of both fusiform initials and the rays in cambium of Hippophae rhamnoides, develops in ontogeny relatively quickly and becomes clearly visible in terminal parenchyma of third and fourth annual ring. At first, anticlinal longitudinal divisions and restricted intrusive growth of fusiform initials lead to the formation of their characteristic horizontal tiers. Then, initiation of secondary rays, taking place rather within such tiers, not between them, makes possible the formation of storied ray pattern. New secondary rays originate most frequently from fusiform initials by their segmentation. This makes the appearance of ray tiers rather quick. However, the high order in the structure of cambium of Hippophae rhamnoides is also due to another, very curious and not known until now mechanism. It operates through limited in its range, thus highly controlled, vertical migration of rays on the cambial surface. This applies to asymmetrically positioned rays either primary, which are often originally sited "out of order" or secondary, initiated off-centre within the existing tiers. Excessively asymmetric rays, lying accidentally on the border between two neighbouring storeys, often undergo splitting and then the derivative rays move toward the centres of the storeys. Ray displacement is due to elimination of one or two of ray initial cells on one edge of the ray and simultaneous, multiple divisions adding new ray cells on the opposite edge.

6

Seasonal changes in the degree of symplasmic continuity between the cells of cambial region of Acer pseudoplatanus and Ulmus minor

72%

Sokolowska K., Zagorska-Marek B.

Acta Societatis Botanicorum Poloniae

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2007

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tom 76

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nr 4

277-286

The presence of symplasmic isolation and symplasmic continuity which are functional aspects of cell-to-cell communication, had been studied in cambium of Acer pseudoplatanus and Ulmus minor, with hope that uniqueness of this meristem, exemplified by its morphology and seasonal variations in its activity is also manifested in differences in the efficiency of communication between cambial cells during the year. The degree of symplasmic continuity was estimated by loading the fluorescent symplasmic tracer to the stem and following its distribution in a population of cambial cells observed on tangential, transverse and radial sections. In active cambium the tracer did not enter the rays. This suggested that the ray and fusiform cells, growing and dividing intensively at different rates were specifically isolated from each other. In the state of dormancy the tracer was present also in the rays implying continuity between the two types of cambial cells. Temporal restriction in tracer spreading from secondary xylem to cambial region was observed on transverse sections in both physiological states of the meristem. Higher degree of symplasmic isolation in active cambium is, most probably, associated with functional distinctiveness of ray and fusiform cells. We hypothesize further that the symplasmic continuity in dormant cambium results from the open conformation states of plasmodesmata, because the energy costs of these states are low. It is reasonable strategy when cambial cells do not divide and maintenance of their functional individuality is not necessary.

7

The role of symplasmic isolation and symplasmic continuity in cambium

72%

Sokolowska K.

Biological Letters

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2005

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tom 42

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nr 2 Spec.Vol.

8

Perception of gravity expressed by production of cambial callus in ash [Fraxinus excelsior L.] internodes

72%

Kurczynska E. U. H. Z.

Acta Societatis Botanicorum Poloniae

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2003

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tom 72

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nr 3

In ash internodes isolated from vertical stems during winter dormancy, cambial activity was stimulated by applying an aqueous solution of auxin to the apical end and water to the basal end. The internodes maintained nearly horizontally produced cambial callus at the apical cut surface with more callus on the upper half although both halves were in contact with the same concentration of auxin. A differential response to auxin of the cambium in the upper and lower halves of the horizontally oriented internodes is postulated.

9

Model of domain pattern formation in storeyed cambium of Tilia cordata MILL.

58%

Ogrodnik B., Wloch W.

Acta Biologica Silesiana

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1993

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tom 24

7-23

10

Seasonal cambial activity of spruce [Picea abies Karst.] with indented rings in the Paneveggio Forest [Trento, Italy]

58%

Nocetti M., Romagnoli M.

Acta Biologica Cracoviensia. Series Botanica

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2008

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tom 50

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nr 2

27-34

Wood with indented rings has long been of interest because it was believed to have special acoustic characteristics and was preferred by the most famous lute and violin makers of the past. In recent years its biological, technical and physical features have become the subject of research. The indentations, which are anatomical anomalies, can be explained by abnormal cambial growth but it is still unclear why and how they are produced. The pinning technique has been used to study the duration and intensity of wood formation of spruce with indented rings grown in the Paneveggio Forest, Italy. The present work describes and discusses the kinetics of cambial activity of trees examined in 2002. Comparison of normal wood and indented xylem showed very similar cambial activity dynamics, characterized by contemporaneous onset and cessation, and by similar trends. Growth rate and final width were the same in each part of the ring. The main differences were not in the timing of xylogenetic processes, but in the morphology of the new cells formed.

11

Wplyw zanieczyszczen srodowiska na aktywnosc podzialowa kambium i roznicowanie pochodnych kambialnych na przykladzie Pinus sylvestris L

58%

Kurczynska E. U., Huflejt B.

Prace Ogrodu Botanicznego Polskiej Akademii Nauk

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1992

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tom 02

83-90

12

Heat as a factor determining the activity of cambium in black alder [Alnus glutinosa [L.] Gaertn.] on moist sites

58%

Wilczynski S., Podlaski R.

Electronic Journal of Polish Agricultural Universities. Series: Forestry

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2007

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tom 10

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nr 1

13

Auxin transport in the cambial region of tree stem cuttings under conditions simulating soil pollution with sulphuric acid and calcium dihydroxide

58%

Wodzicki T. J., Zakrzewski J., Wodzicki A. B., Adamczyk J.

Polish Botanical Studies

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1993

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tom 05

Ograniczanie wyników

The mode of ray initiation affects the rate of double storied pattern formation in cambium

Interlocked grain as an ecological advantage in large emergents and canopy trees

Symplasmic isolation in cambium and phloem cells and its seasonal variation

Participation of intrusive growth between periclinal walls in formation of storied structure of Wisteria floribunda DC. cambium

Ontogenetic development of storied ray pattern in cambium of Hippophae rhamnoides L.

Seasonal changes in the degree of symplasmic continuity between the cells of cambial region of Acer pseudoplatanus and Ulmus minor

The role of symplasmic isolation and symplasmic continuity in cambium

Perception of gravity expressed by production of cambial callus in ash [Fraxinus excelsior L.] internodes

Model of domain pattern formation in storeyed cambium of Tilia cordata MILL.

Seasonal cambial activity of spruce [Picea abies Karst.] with indented rings in the Paneveggio Forest [Trento, Italy]

Wplyw zanieczyszczen srodowiska na aktywnosc podzialowa kambium i roznicowanie pochodnych kambialnych na przykladzie Pinus sylvestris L

Heat as a factor determining the activity of cambium in black alder [Alnus glutinosa [L.] Gaertn.] on moist sites

Auxin transport in the cambial region of tree stem cuttings under conditions simulating soil pollution with sulphuric acid and calcium dihydroxide