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Physiological ecology of desert biocrust moss following 10 years exposure to elevated CO2: evidence for enhanced photosynthetic thermotolerance

Physiologia Plantarum

By:
, , , and
DOI: 10.1111/j.1399-3054.2012.01566.x

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Abstract

In arid regions, biomes particularly responsive to climate change, mosses play an important biogeochemical role as key components of biocrusts. Using the biocrust moss Syntrichia caninervis collected from the Nevada Desert Free Air CO2 Enrichment Facility, we examined the physiological effects of 10 years of exposure to elevated CO2, and the effect of high temperature events on the photosynthetic performance of moss grown in CO2-enriched air. Moss exposed to elevated CO2 exhibited a 46% decrease in chlorophyll, a 20% increase in carbon and no difference in either nitrogen content or photosynthetic performance. However, when subjected to high temperatures (35–40°C), mosses from the elevated CO2 environment showed higher photosynthetic performance and photosystem II (PSII) efficiency compared to those grown in ambient conditions, potentially reflective of a shift in nitrogen allocation to components that offer a higher resistance of PSII to heat stress. This result suggests that mosses may respond to climate change in markedly different ways than vascular plants, and observed CO2-induced photosynthetic thermotolerance in S. caninervis will likely have consequences for future desert biogeochemistry.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Physiological ecology of desert biocrust moss following 10 years exposure to elevated CO2: evidence for enhanced photosynthetic thermotolerance
Series title:
Physiologia Plantarum
DOI:
10.1111/j.1399-3054.2012.01566.x
Volume
144
Issue:
4
Year Published:
2012
Language:
English
Publisher:
Wiley
Publisher location:
Hoboken, NJ
Contributing office(s):
Southwest Biological Science Center
Description:
11 p.
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Physiologia Plantarum
First page:
346
Last page:
356
Number of Pages:
11