Home About Browse Search
Svenska


No carbon limitation after lower crown loss in Pinus radiata

Gomez-Gallego, Mireia and Williams, Nari and Leuzinger, Sebastian and Scott, Peter Matthew and Bader, Martin Karl-Friedrich (2020). No carbon limitation after lower crown loss in Pinus radiata. Annals of Botany. 125 , 955-967
[Journal article]

[img] PDF
2MB

Abstract

Background and Aims Biotic and abiotic stressors can cause different defoliation patterns within trees. Foliar pathogens of conifers commonly prefer older needles and infection with defoliation that progresses from the bottom crown to the top. The functional role of the lower crown of trees is a key question to address the impact of defoliation caused by foliar pathogens.Methods A 2 year artificial defoliation experiment was performed using two genotypes of grafted Pinus radiata to investigate the effects of lower-crown defoliation on carbon (C) assimilation and allocation. Grafts received one of the following treatments in consecutive years: control-control, control-defoliated, defoliated-control and defoliated-defoliated.Results No upregulation of photosynthesis either biochemically or through stomatal control was observed in response to defoliation. The root:shoot ratio and leaf mass were not affected by any treatment, suggesting prioritization of crown regrowth following defoliation. In genotype B. defoliation appeared to impose C shortage and caused reduced above-ground growth and sugar storage in roots, while in genotype A, neither growth nor storage was altered. Root C storage in genotype B decreased only transiently and recovered over the second growing season.
Conclusions In genotype A. the contribution of the lower crown to the whole-tree C uptake appears to be negligible, presumably conferring resilience to foliar pathogens affecting the lower crown. Our results suggest that there is no C limitation after lower-crown defoliation in P. radiata grafts. Further, our findings imply genotype-specific defoliation tolerance in P. radiata.

Authors/Creators:Gomez-Gallego, Mireia and Williams, Nari and Leuzinger, Sebastian and Scott, Peter Matthew and Bader, Martin Karl-Friedrich
Title:No carbon limitation after lower crown loss in Pinus radiata
Year of publishing :2020
Volume:125
Page range:955-967
Number of Pages:13
Publisher:Oxford University Press, The Annals of Botany Company
ISSN:0305-7364
Language:English
Publication Type:Journal article
Article category:Scientific peer reviewed
Version:Published version
Copyright:Creative Commons: Attribution 4.0
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Forest Science
(A) Swedish standard research categories 2011 > 1 Natural sciences > 106 Biological Sciences (Medical to be 3 and Agricultural to be 4) > Botany
Keywords:A/C-i curves, defoliation, biomass, growth, leaf area, non-structural carbohydrates, photosynthesis, Pinus radiata, root:shoot, foliar pathogens
URN:NBN:urn:nbn:se:slu:epsilon-p-107220
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-107220
Additional ID:
Type of IDID
DOI10.1093/aob/mcaa013
Web of Science (WoS)000553098400010
ID Code:17471
Faculty:S - Faculty of Forest Sciences
Department:(NL, NJ) > Dept. of Forest Mycology and Plant Pathology
(S) > Dept. of Forest Mycology and Plant Pathology
Deposited By: SLUpub Connector
Deposited On:18 Sep 2020 11:21
Metadata Last Modified:18 Sep 2020 11:21

Repository Staff Only: item control page

Downloads

Downloads per year (since September 2012)

View more statistics

Downloads
Hits