Сибирский федеральный университет

Тип публикации: статья из журнала

Год издания: 2020

Идентификатор DOI: 10.1163/22941932-bja10004

Ключевые слова: Cell wall thickness; phloem; radial dimension; Pinus sylvestris L.; tracheid; xylem; differentiation , INTRAANNUAL DENSITY-FLUCTUATIONS; WOOD FORMATION; FAGUS-SYLVATICA; ENVIRONMENTAL-FACTORS; SEASONAL DYNAMICS; CARBON LIMITATION; XYLEM FORMATION; PEACH-TREES; SILVER-FIR; GROWTH , cell wall thickness, differentiation, phloem, pinus sylvestris l., radial dimension, tracheid, xylem

Аннотация: We monitored six healthy dominant trees and six girdled Scots pine trees for two successive growing seasons (2014 and 2015) to investigate the seasonal dynamics, cambial activity, and morphology of the new xylem and phloem cells formed under environmental stress when girdling was applied during the dormant period (15 January 2014). Microcore (1.8 mm) samples were collected weekly using a Trephor tool above and below the girdling area, and weather data were measured on site. Drought stress in combination with girdling reduced the total number of differentiation days cell formation. In 2014, no significant differences in tracheid dimensions were observed between the girdled area and the control trees, while in 2015, the control trees showed significantly smaller cell wall thickness and radial dimensions of the latewood tracheids (LW) compared to 2014 and girdled trees had no occurrence of LW. Under stressful heat waves and prolonged periods of no precipitation, the trees tended to reduce the number of tracheids that were formed and exhibited smaller radial dimensions (narrower tree rings) to increase their hydraulic efficiency. Trees responded to limited water availability by forming intra-annual density fluctuations (IADFs L) in the zone of the LW to overcome stressful conditions. Although xylem cell differentiation was affected by stressful conditions, no significant variability in phloem cell dimensions was observed. Thus, the phloem tissue was less sensitive to exogenous factors.

Журнал: IAWA JOURNAL

Выпуск журнала: Vol. 41, Is. 2

Номера страниц: 159-185

ISSN журнала: 09281541

Место издания: LEIDEN

Издатель: BRILL

• Fajstavr Marek (Mendel Univ Brno, Fac Forestry & Wood Technol, Dept Wood Sci & Technol, Zemedelska 3, Brno 61300, Czech Republic; Czech Acad Sci, Czechglobe Global Change Res Inst, Dept Xylogenesis & Biomass Allocat, Domain Environm Effects Terr Ecosyst, Belidla 4a, Brno 60300, Czech Republic)
• Giagli Kyriaki (Mendel Univ Brno, Fac Forestry & Wood Technol, Dept Wood Sci & Technol, Zemedelska 3, Brno 61300, Czech Republic)
• Vavrcik Hanus (Mendel Univ Brno, Fac Forestry & Wood Technol, Dept Wood Sci & Technol, Zemedelska 3, Brno 61300, Czech Republic)
• Gryc Vladimir (Mendel Univ Brno, Fac Forestry & Wood Technol, Dept Wood Sci & Technol, Zemedelska 3, Brno 61300, Czech Republic)
• Horacek Petr (Czech Acad Sci, Czechglobe Global Change Res Inst, Dept Xylogenesis & Biomass Allocat, Domain Environm Effects Terr Ecosyst, Belidla 4a, Brno 60300, Czech Republic)
• Urban Josef (Mendel Univ Brno, Fac Forestry & Wood Technol, Dept Forest Bot Dendrol & Geobiocenol, Zemedelska 3, Brno 61300, Czech Republic; Siberian Fed Univ, Svobodnyj Prospect 79, Krasnoyarsk 660041, Russia)

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