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Auxin (IAA) and soluble carbohydrate seasonal dynamics monitored during xylogenesis and phloemogenesis in Scots pine

Marek Fajstavr (1-2)   , Zuzana Paschová (1), Kyriaki Giagli (1), Hanuš Vavrčík (1), Vladimír Gryc (1), Josef Urban (3-4)

iForest - Biogeosciences and Forestry, Volume 11, Issue 5, Pages 553-562 (2018)
doi: https://doi.org/10.3832/ifor2734-011
Published: Sep 01, 2018 - Copyright © 2018 SISEF

Research Articles


The metabolic activity of phytohormones and the accumulation of carbohydrates affect the reactivation of the cambial zone and the radial increment of woody plants. We aimed to monitor the dynamics of indole-3-acetic acid (IAA) concentration and amounts of soluble carbohydrates during xylem and phloem formation of one growing season (2015). Six sample trees of Scots pine (Pinus sylvestris L.), aged 80 years on average, growing in the Sobešice research site (404 m a.s.l.) in the Czech Republic were selected. We obtained microcore samples at weekly intervals by the Trephor tool method for cell formation analysis and spectrophotometric determination of IAA and soluble carbohydrate contents. We found that time of the highest concentration of IAA (last week of April) coincided with time of the maximum number of cells in the cambial zone and highest expansion of the cell enlargement stage. When the IAA concentration was too low to be measured, latewood tracheids started to form, and late phloem sieve cell formation ceased. The highest concentration of soluble carbohydrates was 200.40 ± 21.6 µg GLU per sample (May 14). This coincided with the fastest weekly xylem cell increment. This research shows that IAA and soluble carbohydrate dynamics directly affects xylem and phloem formation.

  Keywords


Pinus sylvestris L., Indole-3-Acetic Acid, Xylem, Phloem, Tracheids, Earlywood, Latewood

Authors’ address

(1)
Marek Fajstavr
Zuzana Paschová
Kyriaki Giagli
Hanuš Vavrčík
Vladimír Gryc
Department of Wood Science, Faculty of Forestry and Wood Technology, Mendel University in Brno, Zemedelská 3, 61300 Brno (Czech Republic)
(2)
Marek Fajstavr
The Czech Academy of Sciences, CzechGlobe - Global Change Research Institute, Institute of Plant Water Balance and Biomass Production, Belidla 4a, 60300 Brno (Czech Republic)
(3)
Josef Urban
Department of Forest Botany, Dendrology and Geobiocenology, Faculty of Forestry and Wood Technology, Mendel University in Brno, Zemedelská 3, 61300 Brno (Czech Republic)
(4)
Josef Urban
Siberian Federal University, Svobodnyj Prospect 79, Krasnoyarsk, 660041 Krasnoyarsk (Russia)

Corresponding author

 
Marek Fajstavr
fajstavr.maara@gmail.com

Citation

Fajstavr M, Paschová Z, Giagli K, Vavrčík H, Gryc V, Urban J (2018). Auxin (IAA) and soluble carbohydrate seasonal dynamics monitored during xylogenesis and phloemogenesis in Scots pine. iForest 11: 553-562. - doi: 10.3832/ifor2734-011

Academic Editor

Werther Guidi Nissim

Paper history

Received: Jan 19, 2018
Accepted: Jun 26, 2018

First online: Sep 01, 2018
Publication Date: Oct 31, 2018
Publication Time: 2.23 months

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