Effect of growth rate on mean microfibril angle and cross-sectional shape of tracheids of Norway spruce
| Autor: | Peter Fratzl, Ritva Serimaa, Seppo Andersson, Jozef Keckes, Matti-P. Sarén, Pekka Saranpää |
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| Rok vydání: | 2004 |
| Předmět: |
040101 forestry
0106 biological sciences Ecology biology Physiology Forestry Picea abies 04 agricultural and veterinary sciences Plant Science biology.organism_classification 01 natural sciences Horticulture Tracheid Botany 0401 agriculture forestry and fisheries Pith Microfibril Growth rate 010606 plant biology & botany Mathematics |
| Zdroj: | Trees - Structure and Function. 18:354-362 |
| ISSN: | 1432-2285 0931-1890 |
| Popis: | The variation of the mean microfibril angle (MFA) and the shape of the cross-section of lumen with the distance from the pith in fast grown Norway spruce were studied by X-ray scattering and optical microscopy. The samples were from stems of a clone of Norway spruce [ Picea abies (L.) Karst.] grown in a fertile site at Nurmijarvi, southern Finland Both the mean MFA and the circularity index of the lumen of the fast-grown trees decreased more gradually as the distance from the pith increased than those in reference trees grown in a medium fertility site. However, in mature wood the mean MFA reached the same level in fast-grown trees as in reference trees (5°–10°) but the cross-sections of the cells remained more circular in fast-grown trees than in reference trees. The dependence of the mean MFA on the distance from the pith was similar for earlywood and latewood, but the values of the mean MFA of latewood were systematically smaller than those of earlywood. Two different X-ray diffraction geometries were compared from the points of view of biology and data analysis. |
| Databáze: | OpenAIRE |
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