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Title: Radiocarbon Suggests the Hemiparasitic Annual Melampyrum Lineare Desr. May Acquire Carbon from Stressed Hosts

Abstract

Abstract Hemiparasitic plants obtain water and solutes from their hosts, but much remains to be learned about these transfers. We used a forest girdling experiment to investigate how leaf gas exchange, carbon and nitrogen cycling in the root hemiparasiteMelampyrum lineareDesr. responded to disturbance and changes in physiology of potential host trees. By preventing belowground C allocation by 35% of the canopy, girdling decreased the starch and soluble sugar contents of bulk forest floor fine roots. Photosynthetic rates ofM. linearewere statistically significantly lower in the girdled plot, but their hypothesized drivers (foliar N, stomatal conductance and transpiration) had no statistically significant differences between girdled and non-girdled plots. However,M. linearein the girdled plot had higher foliar C concentrations and Δ 14C than in the control plot, suggesting possible photosynthetic down-regulation in the girdled plot due to influx of older (e.g., host-derived) C into the leaves ofM. lineare. Within the girdled plot (but not the control plot),M. linearefoliar C concentrations were positively correlated with foliar Δ 14C and δ 15N, suggesting thatM. linearemay respond to changes in both C and N biogeochemistry during the decline of dominant canopy species.

Authors:
; ; ;
Publication Date:
Research Org.:
Michigan Technological Univ., Houghton, MI (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1538921
DOE Contract Number:  
FC02-06ER64158
Resource Type:
Journal Article
Journal Name:
Radiocarbon
Additional Journal Information:
Journal Volume: 60; Journal Issue: 1; Journal ID: ISSN 0033-8222
Publisher:
Cambridge University Press
Country of Publication:
United States
Language:
English
Subject:
Geochemistry & Geophysics

Citation Formats

Nave, Lucas E., Heckman, Katherine A., Muñoz, Alexandra B., and Swanston, Christopher W. Radiocarbon Suggests the Hemiparasitic Annual Melampyrum Lineare Desr. May Acquire Carbon from Stressed Hosts. United States: N. p., 2017. Web. doi:10.1017/rdc.2017.97.
Nave, Lucas E., Heckman, Katherine A., Muñoz, Alexandra B., & Swanston, Christopher W. Radiocarbon Suggests the Hemiparasitic Annual Melampyrum Lineare Desr. May Acquire Carbon from Stressed Hosts. United States. doi:10.1017/rdc.2017.97.
Nave, Lucas E., Heckman, Katherine A., Muñoz, Alexandra B., and Swanston, Christopher W. Wed . "Radiocarbon Suggests the Hemiparasitic Annual Melampyrum Lineare Desr. May Acquire Carbon from Stressed Hosts". United States. doi:10.1017/rdc.2017.97.
@article{osti_1538921,
title = {Radiocarbon Suggests the Hemiparasitic Annual Melampyrum Lineare Desr. May Acquire Carbon from Stressed Hosts},
author = {Nave, Lucas E. and Heckman, Katherine A. and Muñoz, Alexandra B. and Swanston, Christopher W.},
abstractNote = {Abstract Hemiparasitic plants obtain water and solutes from their hosts, but much remains to be learned about these transfers. We used a forest girdling experiment to investigate how leaf gas exchange, carbon and nitrogen cycling in the root hemiparasiteMelampyrum lineareDesr. responded to disturbance and changes in physiology of potential host trees. By preventing belowground C allocation by 35% of the canopy, girdling decreased the starch and soluble sugar contents of bulk forest floor fine roots. Photosynthetic rates ofM. linearewere statistically significantly lower in the girdled plot, but their hypothesized drivers (foliar N, stomatal conductance and transpiration) had no statistically significant differences between girdled and non-girdled plots. However,M. linearein the girdled plot had higher foliar C concentrations and Δ14C than in the control plot, suggesting possible photosynthetic down-regulation in the girdled plot due to influx of older (e.g., host-derived) C into the leaves ofM. lineare. Within the girdled plot (but not the control plot),M. linearefoliar C concentrations were positively correlated with foliar Δ14C and δ15N, suggesting thatM. linearemay respond to changes in both C and N biogeochemistry during the decline of dominant canopy species.},
doi = {10.1017/rdc.2017.97},
journal = {Radiocarbon},
issn = {0033-8222},
number = 1,
volume = 60,
place = {United States},
year = {2017},
month = {10}
}

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