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The BIG protein distinguishes the process of CO 2 -induced stomatal closure from the inhibition of stomatal opening by CO 2 .

Authors :
He J
Zhang RX
Peng K
Tagliavia C
Li S
Xue S
Liu A
Hu H
Zhang J
Hubbard KE
Held K
McAinsh MR
Gray JE
Kudla J
Schroeder JI
Liang YK
Hetherington AM
Source :
The New phytologist [New Phytol] 2018 Apr; Vol. 218 (1), pp. 232-241. Date of Electronic Publication: 2018 Jan 02.
Publication Year :
2018

Abstract

We conducted an infrared thermal imaging-based genetic screen to identify Arabidopsis mutants displaying aberrant stomatal behavior in response to elevated concentrations of CO <subscript>2</subscript> . This approach resulted in the isolation of a novel allele of the Arabidopsis BIG locus (At3g02260) that we have called CO <subscript>2</subscript> insensitive 1 (cis1). BIG mutants are compromised in elevated CO <subscript>2</subscript> -induced stomatal closure and bicarbonate activation of S-type anion channel currents. In contrast with the wild-type, they fail to exhibit reductions in stomatal density and index when grown in elevated CO <subscript>2</subscript> . However, like the wild-type, BIG mutants display inhibition of stomatal opening when exposed to elevated CO <subscript>2</subscript> . BIG mutants also display wild-type stomatal aperture responses to the closure-inducing stimulus abscisic acid (ABA). Our results indicate that BIG is a signaling component involved in the elevated CO <subscript>2</subscript> -mediated control of stomatal development. In the control of stomatal aperture by CO <subscript>2</subscript> , BIG is only required in elevated CO <subscript>2</subscript> -induced closure and not in the inhibition of stomatal opening by this environmental signal. These data show that, at the molecular level, the CO <subscript>2</subscript> -mediated inhibition of opening and promotion of stomatal closure signaling pathways are separable and BIG represents a distinguishing element in these two CO <subscript>2</subscript> -mediated responses.<br /> (© 2018 The Authors. New Phytologist © 2018 New Phytologist Trust.)

Details

Language :
English
ISSN :
1469-8137
Volume :
218
Issue :
1
Database :
MEDLINE
Journal :
The New phytologist
Publication Type :
Academic Journal
Accession number :
29292834
Full Text :
https://doi.org/10.1111/nph.14957