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Articles containing the keyword 'physiology'

Category : Article

article id 5627, category Article
Philippe de Reffye, Daniel Barthélémy, Frédéric Blaise, Thierry Fourcaud, François Houllier. (1997). A functional model of tree growth and tree architecture. Silva Fennica vol. 31 no. 3 article id 5627. https://doi.org/10.14214/sf.a8529
Keywords: growth; water transport; ecophysiology; plant architecture; assimilate production; mathemetical models; computer simulations; growth simulation
Abstract | View details | Full text in PDF | Author Info

A new approach for modelling plant growth using the software AMAPpara is presented. This software takes into consideration knowledge about plant architecture which has been accumulated at the Plant Modelling Unit of CIRAD for several years, and introduces physiological concepts in order to simulate the dynamic functioning of trees. The plant is considered as a serial connection of vegetative organs which conduct water from the roots to the leaves. Another simple description of the plant as a network of parallel pipes is also presented which allows an analytical formulation of growth to be written. This recurring formula is used for very simple architectures and is useful to understand the role of each organ in water transport and assimilate production. Growth simulations are presented which show the influence of modifications in architecture on plant development.

  • de Reffye, E-mail: pd@mm.unknown (email)
  • Barthélémy, E-mail: db@mm.unknown
  • Blaise, E-mail: fb@mm.unknown
  • Fourcaud, E-mail: tf@mm.unknown
  • Houllier, E-mail: fh@mm.unknown
article id 5464, category Article
Donald I. Dickmann. (1991). Role of physiology in forest tree improvement. Silva Fennica vol. 25 no. 4 article id 5464. https://doi.org/10.14214/sf.a15622
Keywords: flowering; tree breeding; selection criteria; plant physiology; biotechnology; tree improvement; adaptability; ideotypes
Abstract | View details | Full text in PDF | Author Info

The paper introduces different ways plant physiology research can avail the process of tree improvement. The breeding of tree cultivars that efficiently produce a particular wood product or amenity will be an important aspect of forest management. What physiologist can provide to breeders and genetic engineers is the opportunity to move their work from empirical level towards a more theoretical level, and help to make breeding more predictable and more precise in its objectives. The areas of research discussed in the paper are biotechnology, flowering, selection criteria, adaptability and application of ideotypes.

  • Dickmann, E-mail: dd@mm.unknown (email)
article id 5351, category Article
Tapani Repo. (1988). Physical and physiological aspects of impedance measurements in plants. Silva Fennica vol. 22 no. 3 article id 5351. https://doi.org/10.14214/sf.a15508
Keywords: developmental stage; electrical impedance; cross-sectional area; frost resistance; temperature acclimation; physiology
Abstract | View details | Full text in PDF | Author Info

Electrical impedance characteristics of plant cells are dependent on such physiological factors as physiological condition, developmental stage, cell structure, nutrient status, water balance and temperature acclimation. In the measurements also such technical and physical factors as type of electrodes, frequency, geometry of the object, inter-electrode distance and temperature have an effect. These factors are discussed especially with respect to the impedance method in frost resistance studies of plants.

The PDF includes an abstract in Finnish.

  • Repo, E-mail: tr@mm.unknown (email)
article id 4854, category Article
G. M. Kozubov. (1971). Elektronimikroskooppisia tutkimuksia männyn ja kuusen kukka-aiheiden kehityksestä. Silva Fennica vol. 5 no. 4 article id 4854. https://doi.org/10.14214/sf.a14656
English title: Electron microscopic studies in the development of strobile primordia of Scots pine and Norway spruce.
Original keywords: kuusi; mänty; elektronimikroskopia; kasvianatomia; kasvifysiologia; kukka
English keywords: Pinus sylvestris; Norway spruce; Picea abies; Scots pine; electron microscopy; plant anatomy; plant physiology; flower; strobile primordia
Abstract | View details | Full text in PDF | Author Info

This article is an abstract from a lecture given in Helsinki on 2.12.1970. Physiological differences in different parts of developing primordia of micro- and macrostrobiles are manifested in the ultrastructure of the cell tissues. In electron microscopy, the study off metabolic activities can be combined with the anatomical examination of the flower primordia.

The generative cells of Scots pine (Pinus sylvestris L.) and Norway spruce (Picea abies (L.) H. Karst.) develop under the strong metabolic activity of surrounding layers of cells. Simultaneously the activity and development of the organelles in generative cells becomes hindered, and these inhibitions will exist until the fertilization. It can be concluded that the higher the gradient of sexualization of the cells in different parts of flower primordia, the weaker the metabolic activity in these cells.

The PDF includes a summary in English.

  • Kozubov, E-mail: gk@mm.unknown (email)

Category : Article

article id 7227, category Article
D. Fehér. (1929). Biology of forest soil and its physiological meaning in the life of forest. Acta Forestalia Fennica vol. 34 no. 14 article id 7227. https://doi.org/10.14214/aff.7227
Keywords: forest management; regeneration; forest soil; soil physiology
Abstract | View details | Full text in PDF | Author Info

The article presents three studies about different aspects of the bio-chemical functions of forest soil. The three studies are i) research on microflora and microfauna of forest soils; ii) study on carbon nutrition of forests in relation to microbial functions of soil and effecting site factors and iii) study on nitrogen metabolism of forest soil. The results of the studies are summarized by every study.

The article discusses the meaning of the results for forest management in practice. The good biological and physiological condition of forest soil is important for the forest growth and it needs to be taken care in regeneration and other forest management. The natural regeneration seems to be better for soil functions. Favoring broadleaved trees as undergrowth enhances the biological processes of forest soil.   

The volume 34 of Acta Forestalia Fennica is a jubileum publication of professor Aimo Kaarlo Cajander.

  • Fehér, E-mail: df@mm.unknown (email)

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