A survey of Populus PIN-FORMED family genes reveals their diversified expression patterns

作   者：刘伯斌，张进，王琳，李建波，郑环泉，陈军，卢孟柱
期刊名称：Journal of experimental botany
影响因子：5.794
卷 期 号：65(9)
页     码：2437-2448
关键词：
论文摘要：
The plant hormone auxin is a key regulator of plant development, and its uneven distribution maintained by polar
intercellular auxin transport in plant tissues can trigger a wide range of developmental processes. Although the roles
of PIN-FORMED (PIN) proteins in intercellular auxin flow have been extensively characterized in Arabidopsis, their
roles in woody plants remain unclear. Here, a comprehensive analysis of PIN proteins in Populus is presented. Fifteen
PINs are encoded in the genome of Populus, including four PIN1s, one PIN2, two PIN3s, three PIN5s, three PIN6s, and
two PIN8s. Similar to Arabidopsis AtPIN proteins, PtPINs share conserved topology and transmembrane domains,
and are either plasma membrane- or endoplasmic reticulum-localized. The more diversified expansion of the PIN
family in Populus, comparing to that in Arabidopsis, indicates that some auxin-regulated developmental processes,
such as secondary growth, may exhibit unique features in trees. More importantly, different sets of PtoPINs have been
found to be strongly expressed in the roots, leaves, and cambium in Populus; the dynamic expression patterns of
selected PtoPINs were further examined during the regeneration of shoots and roots. This genome-wide analysis of
the Populus PIN family provides important cues for their potential roles in tree growth and development.