The Plant Pathology Journal

The Korean Society of Plant Pathology (한국식물병리학회)
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Arabidopsis PYL8 Plays an Important Role for ABA Signaling and Drought Stress Responses

  • Lim, Chae Woo (Department of Life Sciences, Chung-Ang University) ;
  • Baek, Woonhee (Department of Life Sciences, Chung-Ang University) ;
  • Han, Sang-Wook (Department of Integrative Plant Science, Chung-Ang University) ;
  • Lee, Sung Chul (Department of Life Sciences, Chung-Ang University)
  • Received : 2013.07.22
  • Accepted : 2013.08.26
  • Published : 2013.12.01
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Abstract

Plants are frequently exposed to numerous environmental stresses such as dehydration and high salinity, and have developed elaborate mechanisms to counteract the deleterious effects of stress. The phytohormone abscisic acid (ABA) plays a critical role as an integrator of plant responses to water-limited condition to activate ABA signal transduction pathway. Although perception of ABA has been suggested to be important, the function of each ABA receptor remains elusive in dehydration condition. Here, we show that ABA receptor, pyrabactin resistance-like protein 8 (PYL8), functions in dehydration conditions. Transgenic plants overexpressing PYL8 exhibited hypersensitive phenotype to ABA in seed germination, seedling growth and establishment. We found that hypersensitivity to ABA of transgenic plants results in high degrees of stomatal closure in response to ABA leading to low transpiration rates and ultimately more vulnerable to drought than the wild-type plants. In addition, high expression of ABA maker genes also contributes to altered drought tolerance phenotype. Overall, this work emphasizes the importance of ABA signaling by ABA receptor in stomata during defense response to drought stress.

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References

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