Volume 39 Issue 4
Jul.  2019
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XIE Junyan, ZHANG Yue, ZHENG Huiqiong. Cortical Microtubule Reorientation and Its Relation to Cell Surface Texture of Epidermal Cells of Arabidopsis Thaliana Hypocotyls under Simulated Microgravity Conditions[J]. Journal of Space Science, 2019, 39(4): 478-488. doi: 10.11728/cjss2019.04.478
Citation: XIE Junyan, ZHANG Yue, ZHENG Huiqiong. Cortical Microtubule Reorientation and Its Relation to Cell Surface Texture of Epidermal Cells of Arabidopsis Thaliana Hypocotyls under Simulated Microgravity Conditions[J]. Journal of Space Science, 2019, 39(4): 478-488. doi: 10.11728/cjss2019.04.478

Cortical Microtubule Reorientation and Its Relation to Cell Surface Texture of Epidermal Cells of Arabidopsis Thaliana Hypocotyls under Simulated Microgravity Conditions

doi: 10.11728/cjss2019.04.478

Supported by the China Manned Space Flight Technology Project TG-2 and the National Natural Science Foundation of China (31670864), the National Natural Fund Joint Fund Project(U1738106), the Strategic Pioneer Projects of CAS (XDA15013900), and the National Science Foundation for Young Scientists of China (31500687)

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  • Author Bio:

    ZHENG Huiqiong,hqzheng@sippe.ac.cn

  • Received Date: 2019-04-29
  • Publish Date: 2019-07-15
  • Gravitropic curvature growth of Arabidopsis hypocotyls mainly occurred in the rapid growing Elongation Zone (EZI), not in the slow-growing Elongation Zone (EZⅡ). By examining reorientation of Microtubules (MT) and phenotype of the cell wall in the EZI and the EZⅡ of Arabidopsis hypocotyls under normal gravitational condition, it is found that MTs in the rapid growing epidermal cells were mainly in the transverse direction, while those in the non-growing epidermal cells were in the longitudinal directions. However, this difference in cortical MT arrays between the EZI and EZⅡ cells disappeared when the seedlings were exposed to the simulated microgravity condition on a horizontal clinostat. Field emission scanning electron microscopy revealed that the surface texture of epidermal cells, like the direction of the MT, in the EZI and the EZⅡ also became similar when exposed to the simulated microgravity condition. This result indicated that simulate microgravity could modify the potential differentiation between the EZI and the EZⅡ by affecting the orientation of cortical MT in the epidermal cells.


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