| Cortical Microtubule Reorientation and Its Relation to Cell Surface Texture of Epidermal Cells of Arabidopsis Thaliana Hypocotyls under Simulated Microgravity Conditions |
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| 作者姓名： | XIE Junyan ZHANG Yue ZHENG Huiqiong |
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| 作者单位： | Center for Excellence in Molecular Plant Sciences, Institute of Plant Physiology and Ecology, Chinese Academy of Sciences, Shanghai 200032 |
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| 基金项目： | 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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| 摘 要： | 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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| 关 键 词： | Arabidopsis Cortical microtubule Cell surface texture Hypocotyls Simulated microgravity |
| 收稿时间： | 2019-04-29 |
Cortical Microtubule Reorientation and Its Relation to Cell Surface Texture of Epidermal Cells of Arabidopsis Thaliana Hypocotyls under Simulated Microgravity Conditions |
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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].Chinese Journal of Space Science,2019,39(4):478-488. |
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| Authors: | XIE Junyan ZHANG Yue ZHENG Huiqiong |
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| Institution: | Center for Excellence in Molecular Plant Sciences, Institute of Plant Physiology and Ecology, Chinese Academy of Sciences, Shanghai 200032 |
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| Abstract: | 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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