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Root aquaporins contribute to whole plant water fluxes under drought stress in rice (Oryza sativa L.)

Harvard Dataverse (Africa Rice Center, Bioversity International, CCAFS, CIAT, IFPRI, IRRI and WorldFish)

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Title Root aquaporins contribute to whole plant water fluxes under drought stress in rice (Oryza sativa L.)
 
Identifier https://doi.org/10.7910/DVN/98MUFJ
 
Creator Grondin, Alex
Mauleon, Ramil
Vadez, Vincent
Henry, Amelia
 
Publisher Harvard Dataverse
 
Description Aquaporin activity and root anatomymay affect root hydraulic
properties under drought stress. To better understand the function
of aquaporins in rice root water fluxes under drought, we
studied the root hydraulic conductivity (Lpr) and root sap exudation
rate (Sr) in the presence or absence of an aquaporin inhibitor
(azide) under well-watered conditions and following
drought stress in six diverse rice varieties. Varieties varied in
Lpr and Sr under both conditions. The contribution of aquaporins
to Lpr was generally high (up to 79% under well-watered
conditions and 85% under drought stress) and differentially
regulated under drought. Aquaporin contribution to Sr increased
inmost varieties after drought, suggesting a crucial role
for aquaporins in osmotic water fluxes during drought and recovery.
Furthermore, root plasma membrane aquaporin
(PIP) expression and root anatomical properties were correlated
with hydraulic traits. Three chromosome regions highly
correlated with hydraulic traits of the OryzaSNP panel were
identified, but did not co-locate with known aquaporins. These
results therefore highlight the importance of aquaporins in the
rice root radial water pathway, but emphasize the complex
range of additional mechanisms related to root water fluxes
and drought response.
 
Subject Agricultural Sciences
aquaporins
membrane intrinsic proteins
azide
root hydraulic conductivity
sap exudation
leaf water potential
transpiration rate
 
Contributor Quintana, Marinell