The cambial response of Scots pine trees to girdling and water stress

0524723 - ÚVGZ 2021 RIV NL eng J - Journal Article
Fajstavr, Marek - Giagli, K. - Vavrčík, H. - Gryc, V. - Horáček, Petr - Urban, J.
The cambial response of Scots pine trees to girdling and water stress.
Iawa Journal. Roč. 41, č. 2 (2020), s. 159-185. ISSN 0928-1541. E-ISSN 2294-1932
R&D Projects: GA MŠMT(CZ) LO1415
Research Infrastructure: CzeCOS III - 90123
Institutional support: RVO:86652079
Keywords : intraannual density-fluctuations * wood formation * fagus-sylvatica * environmental-factors * seasonal dynamics * carbon limitation * xylem formation * peach-trees * silver-fir * growth * Cell wall thickness * phloem * radial dimension * Pinus sylvestris L. * tracheid * xylem * differentiation
OECD category: Forestry
Impact factor: 2.323, year: 2020
Method of publishing: Limited access
https://brill.com/view/journals/iawa/41/2/article-p159_3.xml

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.
Permanent Link: http://hdl.handle.net/11104/0309035