NDLI: Maintenance of C sinks sustains enhanced C assimilation during long-term exposure to elevated [CO2] in Mojave Desert shrubs

Content Provider	Springer Nature Link
Author	Aranjuelo, Iker Ebbets, Allison L. Dave Evans, R. Tissue, David T. gués, Salvador Gestel, Natasja Payton, Paxton Ebbert, Volker Adams III, Williams W. wak, Robert S. Smith, Stanley D.
Copyright Year	2011
Abstract	During the first few years of elevated atmospheric [CO2] treatment at the Nevada Desert FACE Facility, photosynthetic downregulation was observed in desert shrubs grown under elevated [CO2], especially under relatively wet environmental conditions. Nonetheless, those plants maintained increased A sat (photosynthetic performance at saturating light and treatment [CO2]) under wet conditions, but to a much lesser extent under dry conditions. To determine if plants continued to downregulate during long-term exposure to elevated [CO2], responses of photosynthesis to elevated [CO2] were examined in two dominant Mojave Desert shrubs, the evergreen Larrea tridentata and the drought-deciduous Ambrosia dumosa, during the eighth full growing season of elevated [CO2] treatment at the NDFF. A comprehensive suite of physiological processes were collected. Furthermore, we used C labeling of air to assess carbon allocation and partitioning as measures of C sink activity. Results show that elevated [CO2] enhanced photosynthetic performance and plant water status in Larrea, especially during periods of environmental stress, but not in Ambrosia. δ13C analyses indicate that Larrea under elevated [CO2] allocated a greater proportion of newly assimilated C to C sinks than Ambrosia. Maintenance by Larrea of C sinks during the dry season partially explained the reduced [CO2] effect on leaf carbohydrate content during summer, which in turn lessened carbohydrate build-up and feedback inhibition of photosynthesis. δ13C results also showed that in a year when plant growth reached the highest rates in 5 years, 4% (Larrea) and 7% (Ambrosia) of C in newly emerging organs were remobilized from C that was assimilated and stored for at least 2 years prior to the current study. Thus, after 8 years of continuous exposure to elevated [CO2], both desert perennials maintained their photosynthetic capacities under elevated [CO2]. We conclude that C storage, remobilization, and partitioning influence the responsiveness of these desert shrubs during long-term exposure to elevated [CO2].
Starting Page	339
Ending Page	354
Page Count	16
File Format	PDF
ISSN	00298549
Journal	Oecologia
Volume Number	167
Issue Number	2
e-ISSN	14321939
Language	English
Publisher	Springer-Verlag
Publisher Date	2011-04-23
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Ambrosia dumosa C allocation/partitioning Free-air CO2 enrichment (FACE) Larrea tridentata Photosynthetic downregulation Plant Sciences Ecology
Content Type	Text
Resource Type	Article
Subject	Ecology, Evolution, Behavior and Systematics

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Data from: A 37-year experimental study of effects of structural alterations on a shrub community in the Mojave Desert, California (Dataset)

Increases in Desert Shrub Productivity under Elevated Carbon Dioxide Vary with Water Availability

Carbon allocation in Larrea tridentata plant-soil systems as affected by elevated soil moisture and N availability

Effects of extreme high temperature, drought and elevated CO2 on photosynthesis of the Mojave Desert evergreen shrub, Larrea tridentata

Elevated CO2 increases plant uptake of organic and inorganic N in the desert shrub Larrea tridentata

Competition between adult and seedling shrubs of Ambrosia dumosa in the Mojave Desert, Nevada

Photosynthesis in an invasive grass and native forb at elevated CO2 during an El Niño year in the Mojave Desert

Data from: Creosote growth rate and reproduction increase in post-fire environments (Dataset)

Controls over nitric oxide and ammonia emissions from Mojave Desert soils

Maintenance of C sinks sustains enhanced C assimilation during long-term exposure to elevated [CO2] in Mojave Desert shrubs

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Data from: A 37-year experimental study of effects of structural alterations on a shrub community in the Mojave Desert, California (Dataset)

Increases in Desert Shrub Productivity under Elevated Carbon Dioxide Vary with Water Availability

Carbon allocation in Larrea tridentata plant-soil systems as affected by elevated soil moisture and N availability

Effects of extreme high temperature, drought and elevated CO2 on photosynthesis of the Mojave Desert evergreen shrub, Larrea tridentata

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