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Plant and Cell Physiology Advance Access originally published online on November 18, 2005
Plant and Cell Physiology 2006 47(1):1-13; doi:10.1093/pcp/pci216
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A Novel Function of Abscisic Acid in the Regulation of Rice (Oryza sativa L.) Root Growth and Development

Chao-Wen Chen1,3, Yun-Wei Yang1,3, Hur-Sheng Lur1,3, Yeou-Guang Tsai2 and Men-Chi Chang1,*

1 Department of Agronomy, National Taiwan University, Taipei Taiwan, ROC
2 EverNew Biotech Inc., Taipei Taiwan, ROC

* Corresponding author: E-mail, menchi{at}ntu.edu.tw; Fax, +886-2-23620879.

Plant roots retain developmental plasticity and respond to environmental stresses or exogenous plant growth regulators by undergoing profound morphological and physiological alteration. In this study, we investigated the effects of exogenous ABA on root growth and development in Taichung native 1 (TN1) rice. Exogenous application of 10 µM ABA leads to swelling, root hair formation and initiation of lateral root primodia in the tips of young, seminal rice roots. Cortex cells increased in size and were irregularly shaped. ABA treatment significantly increased 2, 3, 5-triphenyl tetrazolium chloride (TTC) reductase ability in the root tips and the exudation rate of xylem sap. In addition, the K+ ion content in xylem sap increased nearly 2-fold, but not that of Ca2+ or Mg2+. Analysis of proteins expressed in the root tips identified several ABA-induced or -repressed proteins, including actin depolymerization factor (ADF), late embryo abundant protein (LEA), putative steroid membrane-binding protein, ferredoxin thionine reductase and calcium-binding protein. The effects of ABA on root morphogenesis change were Ca2+ dependent and required the participation of calmodulin and de novo protein synthesis. A model is presented that illustrates how ABA acts through a potential cellular and signal transduction mechanism to induce morphological and physiological changes in rice roots.

3 These authors contributed equally to this work.

(Received March 2, 2005; Accepted October 9, 2005)
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