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

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Johansson , K S L , El-Soda , M , Pagel , E , Meyer , R C , Toldsepp , K , Nilsson , A K , Brosche , M , Kollist , H , Uddling , J & Andersson , M X 2020 , ' Genetic controls of short- and long-term stomatal CO2 responses in Arabidopsis thaliana ' , Annals of Botany , vol. 126 , no. 1 , pp. 179-190 . https://doi.org/10.1093/aob/mcaa065

Title: Genetic controls of short- and long-term stomatal CO2 responses in Arabidopsis thaliana
Author: Johansson, Karin S. L.; El-Soda, Mohamed; Pagel, Ellen; Meyer, Rhonda C.; Toldsepp, Kadri; Nilsson, Anders K.; Brosche, Mikael; Kollist, Hannes; Uddling, Johan; Andersson, Mats X.
Other contributor: University of Helsinki, Plant Biology
University of Helsinki, Univ Tartu, University of Tartu, Inst Technol, IMS Lab



Date: 2020-06-29
Language: eng
Number of pages: 12
Belongs to series: Annals of Botany
ISSN: 0305-7364
DOI: https://doi.org/10.1093/aob/mcaa065
URI: http://hdl.handle.net/10138/319244
Abstract: Background and Aims The stomatal conductance (g(s)) 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 g(s) 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 g(s) Quantitative trait locus (QTL) mapping was used to identify loci controlling short- and long-term g(s) 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-isogonic 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.
Subject: Arabidopsis thaliana
C24
CO2
response
stomata
stomatal conductance
g(s)
stomatal regulation
QTL mapping
RIL
NIL
water-use efficiency
water economy
CARBON-ISOTOPE DISCRIMINATION
ELEVATED CO2
GUARD-CELL
ANION CHANNELS
ABSCISIC-ACID
CONDUCTANCE
KINASE
OZONE
EFFICIENCY
CLOSURE
1181 Ecology, evolutionary biology
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