Arabidopsis PYL8 Plays an Important Role for ABA Signaling and Drought Stress Responses

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.

• Publication year

  2013

• Venue

  Plant Pathology Journal

• Publication date

  2013-12-01

• Fields of study

  Biology, Medicine, Environmental Science

• Identifiers
  DOI 10.5423/PPJ.NT.07.2013.0071PMID 25288979PMCID 4174817
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar, PubMed

• ABA signaling in stomata is emphasized as an important component of plant defense response to drought stress.

  Confidence 0.91

  박진우 (dztg5apj7m) extractionB (s683577b42) reviewAnonymous (n259mg7uxy) review
• High expression of ABA biosynthetic genes contributes to the altered drought tolerance phenotype observed in PYL8-overexpressing plants.

  Confidence 0.84

  박진우 (dztg5apj7m) extractionB (s683577b42) reviewAnonymous (n259mg7uxy) review
• Enhanced abscisic acid sensitivity in PYL8-overexpressing plants is associated with stronger stomatal closure, lower transpiration rates, and greater drought vulnerability.

  Confidence 0.96

  박진우 (dztg5apj7m) extractionB (s683577b42) reviewAnonymous (n259mg7uxy) review
• Overexpression of Arabidopsis PYL8 increases sensitivity to abscisic acid during seed germination, seedling growth, and seedling establishment.

  Confidence 0.97

  박진우 (dztg5apj7m) extractionB (s683577b42) reviewAnonymous (n259mg7uxy) review

• aba biosynthetic genes

  gene set, genetic factor

  Genes involved in the synthesis of abscisic acid.

  Aliases: ABA maker genes

  박진우 (dztg5apj7m) extractionB (s683577b42) reviewAnonymous (n259mg7uxy) review
• aba signaling pathway

  pathway

  The signaling network activated by ABA perception that controls downstream stress responses.

  박진우 (dztg5apj7m) extractionB (s683577b42) reviewAnonymous (n259mg7uxy) review
• abscisic acid

  hormone, signal molecule

  A plant hormone that mediates responses to water-limited conditions in this study.

  Aliases: ABA

  박진우 (dztg5apj7m) extractionB (s683577b42) reviewAnonymous (n259mg7uxy) review
• arabidopsis pyl8

  protein, receptor

  An Arabidopsis thaliana ABA receptor protein, also known as pyrabactin resistance-like protein 8.

  Aliases: PYL8, pyrabactin resistance-like protein 8

  박진우 (dztg5apj7m) extractionB (s683577b42) reviewAnonymous (n259mg7uxy) review
• drought stress responses

  biological response, phenotype

  Plant responses and adaptations associated with dehydration or water-deficit conditions.

  Aliases: drought tolerance phenotype

  박진우 (dztg5apj7m) extractionB (s683577b42) reviewAnonymous (n259mg7uxy) review
• seed germination

  developmental process

  The developmental stage in which a seed begins growth into a seedling.

  박진우 (dztg5apj7m) extractionB (s683577b42) reviewAnonymous (n259mg7uxy) review
• seedling establishment

  developmental process

  The stage when a young seedling becomes successfully established after germination.

  박진우 (dztg5apj7m) extractionB (s683577b42) reviewAnonymous (n259mg7uxy) review
• seedling growth

  developmental process

  The post-germination growth phase of young Arabidopsis plants.

  박진우 (dztg5apj7m) extractionB (s683577b42) reviewAnonymous (n259mg7uxy) review
• stomatal closure

  physiological process

  The closing of stomatal pores that regulate gas exchange and water loss from leaves.

  박진우 (dztg5apj7m) extractionB (s683577b42) reviewAnonymous (n259mg7uxy) review
• transpiration rate

  physiological measure, outcome

  The rate at which water is lost from plant tissues through transpiration.

  박진우 (dztg5apj7m) extractionB (s683577b42) reviewAnonymous (n259mg7uxy) review

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