Chinese Bulletin of Botany ›› 2021, Vol. 56 ›› Issue (2): 151-165.DOI: 10.11983/CBB20198

• INVITED REVIEW • Previous Articles     Next Articles

Advances in Auxin Efflux Carrier PIN Proteins

Yuqing Lin1, Yanhua Qi1,2,*()   

  1. 1State Key Laboratory of Plant Physiology and Biochemistry, Institute of Plant Biology, College of Life Sciences, Zhejiang University, Hangzhou 310058, China
    2Key Laboratory of Herbage and Endemic Crop Biotechnology, Ministry of Education, School of Life Sciences, Inner Mongolia University, Huhehot 010000, China
  • Received:2020-12-03 Accepted:2021-01-18 Online:2021-03-01 Published:2021-03-17
  • Contact: Yanhua Qi

Abstract: Auxin polar transport regulates plant growth and development. The polar transport of auxin mainly depends on three transporters: AUX/LAX, PIN and ABCB protein families. The direction of auxin flow between cells is closely related to the polar localization of PIN proteins in cells. The PIN protein contains a central hydrophilic loop (HL) and two separated hydrophobic regions, and the multiple phosphorylation sites on HL are the targets of protein kinases. The PIN proteins are fine-tuned at multiple levels, including transcriptional regulation, post-transcriptional modification, intracellular recycling and vacuolar trafficking for degradation, in response to endogenous and exogenous signals. Using genome-wide analysis, 12, 15 and 11 PIN like genes have been identified in rice, maize and sorghum, respectively, but the functions of only a few genes have been reported. Here we reviewed the research progress of PIN protein in Arabidopsis thalianaand cereal crops from the aspects of protein structure, activity regulation and functional verification to provide new ideas and clues for exploring the auxin polar transport mediated by PIN protein family.

Key words: PIN protein, auxin polar transport, Arabidopsis thaliana, cereal crops