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Abou‐Attia, Mohamed Awaad; Wang, Xiaojie; Nashaat Al‐Attala, Mohamed; Xu, Qiang; Zhan, Gangming; Kang, Zhensheng

TaMDAR6 acts as a negative regulator of plant cell death and participates indirectly in stomatal regulation during the wheat stripe rust–fungus interaction

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  • Medientyp: E-Artikel
  • Titel: TaMDAR6 acts as a negative regulator of plant cell death and participates indirectly in stomatal regulation during the wheat stripe rust–fungus interaction
  • Beteiligte: Abou‐Attia, Mohamed Awaad; Wang, Xiaojie; Nashaat Al‐Attala, Mohamed; Xu, Qiang; Zhan, Gangming; Kang, Zhensheng
  • Erschienen: Wiley, 2016
  • Erschienen in: Physiologia Plantarum, 156 (2016) 3, Seite 262-277
  • Sprache: Englisch
  • DOI: 10.1111/ppl.12355
  • ISSN: 0031-9317; 1399-3054
  • Schlagwörter: Cell Biology ; Plant Science ; Genetics ; General Medicine ; Physiology
  • Entstehung:
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  • Beschreibung: <jats:p>We identified a new monodehydroascorbate reductase (<jats:styled-content style="fixed-case">MDAR</jats:styled-content>) gene from wheat, designated <jats:italic><jats:styled-content style="fixed-case">TaMDAR6</jats:styled-content></jats:italic>, which is differentially affected by wheat–<jats:italic>Puccinia striiformis</jats:italic> f. sp. <jats:italic>tritici</jats:italic> (<jats:italic>Pst</jats:italic>) interactions. <jats:italic><jats:styled-content style="fixed-case">TaMDAR6</jats:styled-content></jats:italic> is a negative regulator of plant cell death (<jats:styled-content style="fixed-case">PCD</jats:styled-content>) triggered by the <jats:italic>Bax</jats:italic> gene and <jats:italic>Pst.</jats:italic> Transcript levels of <jats:italic><jats:styled-content style="fixed-case">TaMDAR6</jats:styled-content></jats:italic> are significantly upregulated during a compatible wheat–<jats:italic>Pst</jats:italic> interaction, indicating that <jats:italic><jats:styled-content style="fixed-case">TaMDAR6</jats:styled-content></jats:italic> may contribute to plant susceptibility. In addition, <jats:styled-content style="fixed-case">H<jats:sub>2</jats:sub>O<jats:sub>2</jats:sub></jats:styled-content> production and PCD are significantly induced and initial pathogen development is significantly reduced in the <jats:italic><jats:styled-content style="fixed-case">TaMDAR6</jats:styled-content></jats:italic> knocked‐down plants upon <jats:italic>Pst</jats:italic> infection. Thus, the suppression of <jats:italic><jats:styled-content style="fixed-case">TaMDAR6</jats:styled-content></jats:italic> enhances wheat resistance to <jats:italic>Pst</jats:italic>. Besides, the suppression of <jats:italic><jats:styled-content style="fixed-case">TaMDAR6</jats:styled-content></jats:italic> during an incompatible interaction induces a change in the morphology of stomata, which leads to poor stoma recognition and as a consequence to reduced infection efficiency. The percentage of infection sites that develop substomatal vesicles decreases in the <jats:italic><jats:styled-content style="fixed-case">TaMDAR6</jats:styled-content></jats:italic> knocked‐down plants during the incompatible interaction presumably due to the increase in <jats:styled-content style="fixed-case">ROS</jats:styled-content> accumulation, which is likely to activate other resistance mechanisms that have a negative effect on substomatal vesicle formation. <jats:italic><jats:styled-content style="fixed-case">TaMDAR6</jats:styled-content></jats:italic> can therefore be considered a negative regulator of <jats:styled-content style="fixed-case">PCD</jats:styled-content> and of wheat defense to <jats:italic>Pst.</jats:italic></jats:p>