Ecosystem aridity and atmospheric CO2—Response

Science ◽  
2020 ◽  
Vol 368 (6488) ◽  
pp. 252-252 ◽  
Author(s):  
Miguel Berdugo ◽  
Santiago Soliveres ◽  
Manuel Delgado-Baquerizo ◽  
Fernando T. Maestre
Keyword(s):  
Atmospheric Co2 ◽  
Co2 Response

Reversing Excess Atmospheric CO2—Response

Science ◽  
2013 ◽  
Vol 340 (6140) ◽  
pp. 1523.1-1523 ◽  
Author(s):  
Damon Matthews ◽  
Susan Solomon
Keyword(s):  
Atmospheric Co2 ◽  
Co2 Response

scholarly journals Genetic controls of short- and long-term stomatal CO2 responses in Arabidopsis thaliana

2020 ◽  
Vol 126 (1) ◽  
pp. 179-190
Author(s):  
Karin S L Johansson ◽  
Mohamed El-Soda ◽  
Ellen Pagel ◽  
Rhonda C Meyer ◽  
Kadri Tõldsepp ◽  
...  
Keyword(s):  
Arabidopsis Thaliana ◽  
Elevated Co2 ◽  
Stomatal Closure ◽  
Co2 Concentration ◽  
Atmospheric Co2 ◽  
Plant Water ◽  
Co2 Response ◽  
Plant Water Use ◽  
Short And Long Term

Abstract Background and Aims The stomatal conductance (gs) of most plant species decreases in response to elevated atmospheric CO2 concentration. This response could have a significant impact on plant water use in a future climate. However, the regulation of the CO2-induced stomatal closure response is not fully understood. Moreover, the potential genetic links between short-term (within minutes to hours) and long-term (within weeks to months) responses of gs to increased atmospheric CO2 have not been explored. Methods We used Arabidopsis thaliana recombinant inbred lines originating from accessions Col-0 (strong CO2 response) and C24 (weak CO2 response) to study short- and long-term controls of gs. Quantitative trait locus (QTL) mapping was used to identify loci controlling short- and long-term gs responses to elevated CO2, as well as other stomata-related traits. Key Results Short- and long-term stomatal responses to elevated CO2 were significantly correlated. Both short- and long-term responses were associated with a QTL at the end of chromosome 2. The location of this QTL was confirmed using near-isogenic lines and it was fine-mapped to a 410-kb region. The QTL did not correspond to any known gene involved in stomatal closure and had no effect on the responsiveness to abscisic acid. Additionally, we identified numerous other loci associated with stomatal regulation. Conclusions We identified and confirmed the effect of a strong QTL corresponding to a yet unknown regulator of stomatal closure in response to elevated CO2 concentration. The correlation between short- and long-term stomatal CO2 responses and the genetic link between these traits highlight the importance of understanding guard cell CO2 signalling to predict and manipulate plant water use in a world with increasing atmospheric CO2 concentration. This study demonstrates the power of using natural variation to unravel the genetic regulation of complex traits.

Assessment of cultivated and wild, weedy rice lines to concurrent changes in CO2 concentration and air temperature: determining traits for enhanced seed yield with increasing atmospheric CO2

2014 ◽  
Vol 41 (3) ◽  
pp. 236 ◽  
Author(s):  
Lewis H. Ziska ◽  
Martha B. Tomecek ◽  
David R. Gealy
Keyword(s):  
Air Temperature ◽  
Seed Yield ◽  
Effective Means ◽  
Co2 Concentration ◽  
Atmospheric Co2 ◽  
Growth And Yield ◽  
Yield Response ◽  
Weedy Rice ◽  
Co2 Response ◽  
Rice Line

Although several studies have examined intra-specific variability in growth and yield to projected atmospheric CO2 concentration, [CO2], few have considered concurrent increases in air temperature and [CO2], and none have compared the relative responses of cultivated and wild, weedy crop lines. In the current study we quantified the growth and seed yield response of three cultivated (‘Rondo’, ‘Clearfield 161’, ‘M204’) and one wild (red) rice line (‘Stuttgart-S’ or ‘Stg-S’), grown at ambient or +200 µmol mol–1 [CO2] at one of three day/night temperatures (29/21, 31/23 or 33/25°C). Averaged among all cultivars, [CO2] increased biomass and seed yield, but conversely, increasing air temperature reduced the [CO2] response of both parameters. Among the cultivated and weedy rice tested, ‘Rondo’ and ‘Stg-S’ showed significant increases in aboveground biomass and seed yield with elevated [CO2] at 29/21°C; however, only ‘Stg-S’, the weedy rice line, demonstrated a significant increase with [CO2] at all growth temperatures. A regression analysis for this line indicated that the relative increase in seed yield with [CO2] and air temperature was positively associated with panicle and tiller number, but negatively correlated with the percentage of immature seed. An analysis of all lines indicated that the ratio of tiller production between CO2 treatments at 30 days after sowing (DAS) was a significant predictor of seed yield response to increasing [CO2] for all temperatures. These results suggest that: (i) inclusion of wild lines may broaden genotypic or phenotypic variation and assist in selection to temperature/[CO2]; and (ii) early differences in tiller formation may be an effective means to facilitate screening for CO2 sensitive rice genotypes.

Increase of atmospheric CO2: Response patterns of a simple terrestrial man-made ecosystem

2003 ◽  
Vol 31 (7) ◽  
pp. 1731-1735 ◽  
Author(s):  
L.A. Somova ◽  
N.S. Pechurkin ◽  
T.I. Pisman
Keyword(s):  
Atmospheric Co2 ◽  
Response Patterns ◽  
Co2 Response

A global perspective of ground level, 'ambient' carbon dioxide for assessing the response of plants to atmospheric CO2

2001 ◽  
Vol 7 (7) ◽  
pp. 789-796 ◽  
Author(s):  
L. H. Ziska ◽  
O. Ghannoum ◽  
J. T. Baker ◽  
J. Conroy ◽  
J. A. Bunce ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Ground Level ◽  
Global Perspective ◽  
Atmospheric Co2
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