Agrobacterium-Mediated Transformation of Resveratrol Synthase Gene (PcPKS5) into Huping Jujube (Zizyphus jujuba) AtJ3 is Involved in ABA Response through Interaction with the PKS5 Kinase in Arabidopsis In vitro expression and determination of phosphorylation activity of point mutants of the PKS5 kinase in Arabidopsis Characteristics of the Point Mutants of PKS5 Respond to the Salt-alkali Stress in Arabidopsis Trafficking of AtJ3 from the Nucleus to the Cytoplasm Regulates Plasma Membrane H+-ATPase Activity and ABA Response in Arabidopsis