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Research Advances in Auxin Efflux Carrier PIN Proteins
Zou Chunxue, Men Shuzhen*
Department of Plant Biology and Ecology, College of Life Sciences, Nankai University, Tianjin 300071, China
Abstract: Auxin as the first found phytohormone plays critical roles in a variety of physiological and developmental processes of plants， such as apical dominance， inflorescence and phyllotaxis development， embryogenesis，root development， lateral root and adventitious root initiation， tropism and vascular differentiation. These processes depend on the establishment of the auxin concentration gradients coordinated by auxin biosynthesis and directional transport. The polar auxin transport is mediated by auxin influx carriers from the AUX/LAX protein family， and by auxin efflux proteins from the PIN family and the ABCB/PGP family. This review focuses on the progress made on the study of PIN proteins， includes PIN proteins’subcellular localization and function， the regulationof PIN proteins’ expression， as well as PIN proteins’ intracellular trafficking.
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