Pan, Jianwei , Zhang, Kuihua , Li, Guangming , Chen, Rujin .
Auxin regulates polar axuin transport by regulating the auxin efflux facilitator PINs localization and activity.
Plant hormone auxin plays an important role in the regulation of almost all plant developmental processes such as the establishment of root and shoot architecture, organ pattern formation, vascular development, and cell division/elongation and response to the environment such as gravitropism, phototropism. Auxin can be polarly transported from synthesis sites to action sites in a strict directionality through influx carriers (AUX1/ LAX) and efflux carriers (PINs). Recently, the auxin efflux facilitator PIN proteins have been identified as rate-limiting factors in the generation of local auxin gradients essential for plant development. Consistent with their role in auxin transport, PIN proteins are integral plasma-membrane proteins, exhibiting polar localization in specific plant cells. However, mechanisms controlling their plasma-membrane localization and turnover are still unclear. To understand molecular mechanisms of auxin transport involved in almost all growth and developmental processes, the regulation of PINs polar localization and stability was studied using molecular, genetic, cellular, and biochemical technologies in Arabidopsis. Our primary data show that increased auxin level can enhance PINs localization on plasma membrane and then increase basipetal auxin transport activity.
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1 - The Samuel Roberts Noble Foundation, Plant Biology Division, 2510 Sam Noble Parkway, Ardmore, OK, 73401, USA
2 - The Samuel Roberts Noble Foundation
polar auxin transport.
Presentation Type: Plant Biology Abstract
Location: Exhibit Hall (Northeast, Southwest & Southeast)/Hilton
Date: Sunday, July 8th, 2007
Time: 8:00 AM