Dissecting the membrane-microtubule sensor in grapevine defence.
Pingyin Guan1,2, Wenjing Shi3, Michael Riemann3
1College of Horticulture, China Agricultural University, Beijing, 100193, China. pyguan@cau.edu.cn.
Horticulture Research
|December 1, 2021
Summary
Plant cell microtubules and plasma membrane interactions are crucial for sensing biotic stress. Membrane modifiers like DMSO and Benzyl Alcohol differentially regulate plant defense gene expression against bacterial elicitors.
Area of Science:
- Plant cell biology
- Molecular plant pathology
- Abiotic and biotic stress signaling
Background:
- Plant microtubules and plasma membrane interactions are known to mediate abiotic stress responses.
- The role of this system in biotic stress perception remains less understood.
Purpose of the Study:
- To investigate the involvement of plant cell microtubules and plasma membrane in biotic stress signaling.
- To determine how membrane fluidity modulators affect plant defense responses to bacterial elicitors.
Main Methods:
- Utilized grapevine cell lines expressing GFP-tagged microtubules and actin filaments for in vivo visualization.
- Applied bacterial elicitors (harpin and flg22) in combination with membrane fluidity modulators (DMSO, Benzyl Alcohol).
- Quantified defense gene expression and microtubule stability.
Main Results:
- DMSO (membrane rigidifier) induced microtubule bundling and defense responses, but differentially affected gene expression to harpin vs. flg22.
- Benzyl Alcohol (membrane fluidizer) mimicked DMSO's effects, suggesting complex interactions.
- Taxol stabilized microtubules and amplified phytoalexin (PAL) transcript responses.
Conclusions:
- Plant cell membrane fluidity and microtubule dynamics play specific roles in processing pathogen-derived signals.
- The plant perception system exhibits distinct responses to different biotic stress elicitors.
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