Abstract
The present study investigated whether Ca2+ mobilization independent of phosphoinositide-specific phospholipase C (PI-PLC) would delay wilting in Arabidopsis thaliana (L.) Heynh. cv. Columbia through mediating stomatal closure at abscisic acid (ABA) concentrations rising beyond a drought-specific threshold value. In wild type (WT) epidermis, the PI-PLC inhibitor (U73122) affected the stomatal response to 20 µM ABA but not to 30 µM ABA. Disruption in GTP-binding protein ά subunit 1 (GPA1) affected the stomatal response to 30 µM ABA, but not to 20 µM ABA. In the gpa1-4 mutant, the inhibitory effects of the Ca2+ buffer, 1,2-bis(0-aminophenoxy)ethane-N,N,N′,N′-tetraacetic acid (BAPTA), the inactive mastoparan analogue, mas17 and the antagonist of cyclic ADP-ribose synthesis, nicotinamide, were differentially attenuated on 30 µM ABA-induced stomatal closure. By contrast, the NADPH oxidase atrbohD/F double mutation fully suppressed inhibition of 20 µM ABA-induced stomatal closure by BAPTA or U73122 as well as inhibition of 30 µM ABA-induced stomatal closure by BAPTA, mas17 or nicotinamide. On the contrary, The Al resistant alr-104 mutation modulated ABA-induced stomatal closure by a stimulatory effect of U73122 and an increased sensitivity to mas17, nicotinamide and BAPTA. Compared to WT, the atrbohD/F double mutant was more hypersensitive than the gpa1-4 mutant to wilting under the tested water stress conditions, whereas wilting was delayed in the alr-104 mutant. Since the atrbohD/F mutation breaks down ABA-induced Ca2+ signalling through fully preventing apoplastic Ca2+ to enter into the guard cells, these results showed that a putative guard cell GPA1-dependent ADP-ribosyl cyclase activity should contribute to drought tolerance within PI-PLC-independent-Ca2+-mediated ABA signalling.
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Abbreviations
- ABA:
-
abscisic acid
- ARC:
-
ADP-ribosyl cyclase
- BAPTA:
-
1,2-bis(0-aminophenoxy)ethane-N,N,N′,N′-tetraacetic acid
- cADPR:
-
cyclic ADP-ribose
- DAG:
-
diacylglycerol
- Dex:
-
dexamethasone
- GPA1:
-
GTP-binding protein α subunit 1
- G protein:
-
GTP-binding protein
- Gα:
-
GTP-binding protein α subunit
- NAADP:
-
nicotinic acid adenine dinucleotide phosphate
- PI-PLC:
-
phosphoinositide-specific phospholipase C
- U73122:
-
1,6-[17β-3-methoxyestra-1,3,5(10)-trien-17-yl] aminohexyl-1Hpyrrole-2,5-dione
- U73343:
-
1,6-[17β-3-methoxyestra-1,3,5(10)-trien-17-yl] aminohexyl-2,5-pyrrolidine-dione
- WT:
-
wild type
- 7TMS:
-
seven-transmembrane-spanning
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Cousson, A. Involvement of phospholipase C-independent calcium-mediated abscisic acid signalling during Arabidopsis response to drought. Biol Plant 53, 53–62 (2009). https://doi.org/10.1007/s10535-009-0008-0
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DOI: https://doi.org/10.1007/s10535-009-0008-0