作者：Bobin Liu, Jin
Zhang, Lin Wang， Jianbo Li， Huanquan Zheng, Jun Chen， and Mengzhu Lu*
期刊：Journal of
experimental botany
发表时间：2014年
卷.期.页码：65(9)：2437-2448
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.