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Root aquaporins contribute to whole plant water fluxes under drought stress in rice ( Oryza sativa L.)
Author(s) -
Grondin Alexandre,
Mauleon Ramil,
Vadez Vincent,
Henry Amelia
Publication year - 2016
Publication title -
plant, cell and environment
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.646
H-Index - 200
eISSN - 1365-3040
pISSN - 0140-7791
DOI - 10.1111/pce.12616
Subject(s) - aquaporin , oryza sativa , drought stress , biology , hydraulic conductivity , water transport , agronomy , root system , drought tolerance , botany , water flow , physiology , soil water , gene , environmental science , ecology , biochemistry , soil science
Aquaporin activity and root anatomy may 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 ( Lp r) and root sap exudation rate ( S r) 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 Lp r and S r under both conditions. The contribution of aquaporins to Lp r was generally high (up to 79% under well‐watered conditions and 85% under drought stress) and differentially regulated under drought. Aquaporin contribution to S r increased in most 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.