Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/48304
Title: CONTROL OF EARLY RESPONSES OF ARABIDOPSIS ROOTS TO ABA AND ABIOTIC STRESSES
Authors: SEAH SENG WEE
Keywords: auxin, ABA, salt, cold, root elongation zone, early responses
Issue Date: 21-Aug-2013
Source: SEAH SENG WEE (2013-08-21). CONTROL OF EARLY RESPONSES OF ARABIDOPSIS ROOTS TO ABA AND ABIOTIC STRESSES. ScholarBank@NUS Repository.
Abstract: Post-embryonic plant development is guided by an integration of environmental and intrinsic signals to determine a specific developmental regulation. Here, we explore the role of ABA in Arabidopsis root elongation zone to reveal developmental and cellular insights into its regulation. We uncover a unique regulatory crosstalk between ABA and auxin acting through AXR3, which acts through auxin transporters AUX1 and PINs to regulate the auxin distribution at the root epidermal and lateral root cap tissues. Moreover, at the cellular level, we demonstrate that ABA enhances PLD 2-facilitated vesicular trafficking to downregulate auxin transporters to redistribute inter and intra-cellular auxin distribution in an actin-dependent manner. ABA treatment promotes the endocytosis and inhibits the recycling of auxin transporters, in turn sequestering them in endosomal recycling compartments. This fine-tuning of membrane abundance of auxin transporters allows for a novel rapid on-transcriptional regulation of auxin transport. Taken together, our findings provide both the tissue and cellular basis for the role of ABA in root growth regulation.
URI: http://scholarbank.nus.edu.sg/handle/10635/48304
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