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Plant and Cell Physiology Advance Access published online on November 18, 2005
Plant and Cell Physiology, doi:10.1093/pcp/pci216
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Plant and Cell Physiology 2005 © The Japanese Society of Plant Physiologists (JSPP); all rights reserved.
Received March 2, 2005
Accepted October 9, 2005

Regular Paper

A Novel Function of Abscisic Acid in the Regulation of Rice (Oryza sativa L.) Root Growth and Development

Chao-Wen Chen 1 3, Yun-Wei Yang 1 3, Hur-Sheng Lur 1 3, Yeou-Guang Tsai 2, and Men-Chi Chang 1 *

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

* To whom correspondence should be addressed.
Men-Chi Chang, E-mail: menchi{at}ntu.edu.tw


  Abstract

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 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 irregularly shaped. ABA treatment significantly increased 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 Ca2+ or Mg 2+. Analysis of proteins expressed in the root tips identified several ABA-induced/ or -repressed proteins, including acting depolymerization factor (ADF), 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.

Keywords: abscisic acid (ABA); lateral root; actin depolymerization factor (ADF); proteomics; Oryza sativa L.

3 These authors contributed equally to this work.


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