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The auxin influx carriers auxin resistant 1/like aux 1 (AUX/LAX), efflux carriers pin-formed (PIN) (together with PIN-like proteins) and efflux/conditional P-glycoprotein (ABCB) are major protein families involved in auxin polar transport. However, how they function in responses to exogenous auxin and abiotic stresses in maize is largely unknown. In this work, the latest updated maize ( Zea mays  L.) reference genome sequence was used to characterize and analyze the  ZmLAX ,  ZmPIN ,  ZmPILS  and  ZmABCB  family genes from maize. The results showed that five  ZmLAXs , fifteen  ZmPINs , nine  ZmPILSs  and thirty-five  ZmABCBs  were mapped on all ten maize chromosomes. Highly diversified gene structures, nonconservative transmembrane helices and tissue-specific expression patterns suggested the possibility of function diversification for these genes. Quantitative real-time polymerase chain reaction (qRT-PCR) was used to analyze the expression patterns of  ZmLAX ,  ZmPIN ,  ZmPILS  and  ZmABCB  genes under exogenous auxin and different environmental stresses. The expression levels of most  ZmPIN ,  ZmPILS ,  ZmLAX  and  ZmABCB  genes were induced in shoots and were reduced in roots by various abiotic stresses (drought, salt and cold stresses). The opposite expression response patterns indicated the dynamic auxin transport between shoots and roots under abiotic stresses. Analysis of the expression patterns of  ZmPIN ,  ZmPILS ,  ZmLAX  and  ZmABCB  genes under drought, salt and cold treatment may help us to understand the possible roles of maize auxin transporter genes in responses and tolerance to environmental stresses.

plos one

Genome-Wide Identification and Expression Profiling Analysis of ZmPIN, ZmPILS, ZmLAX and ZmABCB Auxin Transporter Gene Families in Maize (Zea mays L.) under Various Abiotic Stresses