Сибирский федеральный университет

Тип публикации: статья из журнала

Год издания: 2018

Идентификатор DOI: 10.1007/s10342-017-1090-z

Ключевые слова: Carbohydrates, Hydraulic architecture, Needle anatomy, Needle growth, Pinus sylvestris, Tracheids, Xylem transport

Аннотация: 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.

Журнал: EUROPEAN JOURNAL OF FOREST RESEARCH

Выпуск журнала: Vol. 137, Is. 1

Номера страниц: 57-67

ISSN журнала: 16124669

Место издания: NEW YORK

Издатель: SPRINGER

• Gebauer Roman (Mendel Univ Brno, Fac Forestry & Wood Technol, Zemedelska 3, Brno 61300, Czech Republic)
• Plichta Roman (Mendel Univ Brno, Fac Forestry & Wood Technol, Zemedelska 3, Brno 61300, Czech Republic)
• Bednarova Emilie (Mendel Univ Brno, Fac Forestry & Wood Technol, Zemedelska 3, Brno 61300, Czech Republic)
• Foit Jiri (Mendel Univ Brno, Fac Forestry & Wood Technol, Zemedelska 3, Brno 61300, Czech Republic)
• Cermak Vaclav (Mendel Univ Brno, Fac Forestry & Wood Technol, Zemedelska 3, Brno 61300, Czech Republic)
• Urban Josef (Mendel Univ Brno, Fac Forestry & Wood Technol, Zemedelska 3, Brno 61300, Czech Republic; Siberian Fed Univ, Svobodnyj Prospekt 79, Krasnoyarsk, Russia)

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