Responses of sapwood ray parenchyma and non-structural carbohydrates of Pinus sylvestris to drought and long-term irrigation
URI (for links/citations):http://onlinelibrary.wiley.com/doi/10.1111/1365-2435.12860/abstract
Georg, Von Arx
Jose, Miguel Olano
Институт экологии и географии
Laboratory of Biogeochemestry of Ecosystems
Journal Name:Functional Ecology
Journal Quartile in Scopus:Q1
Journal Quartile in Web of Science:Q1
Bibliographic Citation:Georg, Von Arx. Responses of sapwood ray parenchyma and non-structural carbohydrates of Pinus sylvestris to drought and long-term irrigation [Текст] / Von Arx Georg, Arzac Alberto, Fonti Patrick, Frank David, Zweifel Roman, Rigling Andreas, Galiano Lucia, Gessler Arthur, Miguel Olano Jose // Functional Ecology. — 2017. — Т. 31 (№ 7). — С. 1371-1382
Текст статьи не публикуется в открытом доступе в соответствии с политикой журнала.
1. Non-structural carbohydrates (NSC) play a crucial role in tree resistance and resilience to drought. Stem sapwood parenchyma is among the largest storage tissue for NSC in mature trees. However, there is a limited mechanistic understanding of how NSC reserves, stem parenchyma abundance and growth rates are interrelated, and how they respond to changing water availability. 2. We quantified NSC, ray parenchyma abundance and ring width along four successive 5-year radial sapwood segments of the stem of 40 mature Pinus sylvestris trees from a 10-year irrigation experiment conducted at a xeric site in Switzerland. 3. Percentage of ray volume (PERPAR) varied from 3 75 to 8 94% among trees, but showed low intra-individual variability. PERPAR responded positively to irrigation with a lag of several years, but was unrelated to %NSC. %NSC was lower in wider rings. However, wider rings still contained a larger NSC pool that was positively related to next year’s ring growth. 4. Our results suggest that stem ray parenchyma does not limit NSC storage capacity, but responds to long-term environmental drivers with years of delay. The observed carbon allocation patterns indicate a prioritization of storage over growth independent of growth conditions, likely as a mechanism to ensure long-term survival. Furthermore, NSC pool size proved to be a determinant for the inter-annual autocorrelation in tree-ring growth. Our study highlights the importance of long-term multi-parameter studies to better understand tree responses to environmental variability at different time-scales.