The role of defoliation and root rot pathogen infection in driving the mode of drought-related physiological decline in Scots pine (Pinus sylvestris L.)

Tree Physiology
David AguadéJ Martínez-Vilalta

Abstract

Drought-related tree die-off episodes have been observed in all vegetated continents. Despite much research effort, however, the multiple interactions between carbon starvation, hydraulic failure and biotic agents in driving tree mortality under field conditions are still not well understood. We analysed the seasonal variability of non-structural carbohydrates (NSCs) in four organs (leaves, branches, trunk and roots), the vulnerability to embolism in roots and branches, native embolism (percentage loss of hydraulic conductivity (PLC)) in branches and the presence of root rot pathogens in defoliated and non-defoliated individuals in a declining Scots pine (Pinus sylvestris L.) population in the NE Iberian Peninsula in 2012, which included a particularly dry and warm summer. No differences were observed between defoliated and non-defoliated pines in hydraulic parameters, except for a higher vulnerability to embolism at pressures below -2 MPa in roots of defoliated pines. No differences were found between defoliation classes in branch PLC. Total NSC (TNSC, soluble sugars plus starch) values decreased during drought, particularly in leaves. Defoliation reduced TNSC levels across tree organs, especially just before (June) and during...Continue Reading

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Citations

Oct 21, 2016·Global Change Biology·Maxime CailleretJordi Martínez-Vilalta
Dec 16, 2016·Global Change Biology·Guillermo Gea-IzquierdoJoel Guiot
Oct 30, 2016·Tree Physiology·Núria Garcia-FornerJordi Martínez-Vilalta
Jan 13, 2017·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·Jan Stenlid, Jonàs Oliva
Jan 29, 2020·Annals of Botany·Mireia Gomez-GallegoMartin Karl-Friedrich Bader
Apr 25, 2021·Plant Physiology·Peipei ZhangVanessa L Bailey

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