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G Protein Regulation of Ion Channels and Abscisic Acid Signaling in Arabidopsis Guard Cells
Xi-Qing Wang,1Hemayet Ullah,2Alan M. Jones,2Sarah M. Assmann1*
The phytohormone abscisic acid (ABA) promotes plant water
conservation by decreasing the apertures of stomatal pores in theepidermis through which water loss occurs. We found that
Arabidopsisthaliana plants harboring transferred DNA
insertional mutationsin the sole prototypical heterotrimeric
GTP-binding (G) protein subunit gene, GPA1, lack both
ABA inhibition of guard cell inwardK+ channels and
pH-independent ABA activation of anion channels.Stomatal opening in
gpa1 plants is insensitive to inhibition byABA, and the
rate of water loss from gpa1 mutants is greater thanthat
from wild-type plants. Manipulation of G protein status inguard cells
may provide a mechanism for controlling plant waterbalance.
1 Biology Department, Pennsylvania State
University, 208 Mueller Laboratory, University Park, PA 16802-5301,
USA.
2 Department of Biology, University of North
Carolina, Chapel Hill, NC 27599-3280, USA.
*
To whom correspondence should be addressed. E-mail:
sma3{at}psu.edu
The editors suggest the following Related Resources on Science sites:
In Science Magazine
PERSPECTIVES
Brian E. Ellis and Godfrey P. Miles (15 June 2001) Science292 (5524), 2022.
[DOI: 10.1126/science.1062790] |Summary »|Full Text »
REPORTS
Hemayet Ullah, Jin-Gui Chen, Jeff C. Young, Kyung-Hoan Im, Michael R. Sussman, and Alan M. Jones (15 June 2001) Science292 (5524), 2066.
[DOI: 10.1126/science.1059040] |Abstract »|Full Text »|PDF »|Supplemental Data »
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subunit gene, GPA1, lack both
ABA inhibition of guard cell inward K+ channels and
pH-independent ABA activation of anion channels. Stomatal opening in
gpa1 plants is insensitive to inhibition by ABA, and the
rate of water loss from gpa1 mutants is greater than that
from wild-type plants. Manipulation of G protein status in guard cells
may provide a mechanism for controlling plant water balance.
