Evidence of Hydropassive Movement in Stomatal Oscillations of Glycyrrhiza inflata under Desert Conditions

WANG Gen_Xuan 1 *, LIAO Jian_Xiong 1, WU Dong_Xiu 2 [WT6BZ](1. State Key Laboratory of Arid Agroecology, Lanzhou University, Lanzhou 730000, China; 2. Department of Biology, Henan University, Kaifeng 475001, China)  

Stomatal conductance was found to change from steady_state to a state of oscillations during daytime when vapour pressure deficit (VPD) increased to a value of 1 kPa in Glycyrrhiza inflata Batalin grown under the conditions of arid desert in north_west China. The injected metabolic inhibitors (NaN 3 or carbonyl cyanide_m_chlorophenyl_hydrazone (CCCP)) slightly reduced the stomatal conductance but did not significantly decrease the intensity of stomatal oscillations (amplitude/average). The oscillation intensity was found to be significantly correlated with VPD and root resistance, but not with the respiration rate. There might exist a minimum threshold of VPD (0.8 kPa) and root resistance (1/4 relative value) that induced stomatal oscillations. These results suggested that stomatal oscillations induced by atmospheric drought stress and root resistance were mainly a type of hydropassive movement.

【Fund】： SupportedbytheNationalNaturalScienceFoundationofChina ( 3 9770 447) ;;NationalKeyBasicResearchSpecialFundsofChina (G19990 1170 5
【CateGory Index】： Q948.112+.3

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