How timing of stem girdling affects needle xylem structure in Scots pine
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https://link.springer.com/article/10.1007%2Fs10342-017-1090-zhttps://elib.sfu-kras.ru/handle/2311/110444
Author:
Roman, Gebauer
Roman, Plichta
Emilie, Bednářová
Jiří, Foit
Václav, Čermák
Урбан, Йозеф
Corporate Contributor:
Институт экологии и географии
Лаборатория биогеохимии экосистем
Date:
2018-02Journal Name:
European Journal of Forest ResearchJournal Quartile in Scopus:
Q1Journal Quartile in Web of Science:
Q1Bibliographic Citation:
Roman, Gebauer. How timing of stem girdling affects needle xylem structure in Scots pine [Текст] / Gebauer Roman, Plichta Roman, Bednářová Emilie, Foit Jiří, Čermák Václav, Йозеф Урбан // European Journal of Forest Research. — 2018. — Т. 137 (№ 1). — С. 57-67Abstract:
While needles represent a proportionally large fraction of whole-plant hydraulic resistance, no studies to date have investigated how source–sink disturbances affect needle xylem structure. In this study, we evaluated structural changes in xylem in current-year needles of Scots pine 227 and 411 days after stem girdling (hereafter referred to as DAG). Maximum and minimum tracheid lumen diameters and therefore also the size of tracheid lumen areas increased in needles 227 DAG compared to control needles. In contrast, tracheid dimensions were similar in needles 411 DAG as in the control needles, but smaller xylem area and lower number of tracheids resulted in the lower theoretical needle hydraulic conductivity of those needles. Several needle xylem parameters were intercorrelated in both control and girdled trees. These observed changes provide a new understanding of the processes that occur following a source–sink disturbance. Considering anatomical parameters such as the number of tracheids, tracheid dimension, or needle xylem area, which are rarely described in physiological studies, could be helpful, for example, in understanding to tree hydraulic systems or for modeling gas exchange. Finally, empirical equations were developed to calculate needle theoretical hydraulic conductivity and the number of tracheids in needles using an easily measurable parameter of needle xylem area.
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