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Dynamical and Microrheological Analysis of Amyloplasts in the Plant Root Gravity-Sensing Cells
Zheng ZY(郑中玉); Zou JJ; Li HH; Xue S; Le J; Wang YR(王育人); Zheng, ZY (reprint author), Chinese Acad Sci, Key Lab Micrograv, Inst Mech, Beijing 100190, Peoples R China.
Source PublicationMICROGRAVITY SCIENCE AND TECHNOLOGY
2015-09
Volume27Issue:6Pages:485-493
ISSN0938-0108
AbstractGravitropism in plants is one of the most controversial issues. In the most wildly accepted starch-statolith hypothesis the sedimentation movement of amyloplasts in the gravisensing columella cells primarily triggers the asymmetric distribution of auxin which leads to the differential growth of the plant root. It has been gradually recognized that the inhomogeneous structures in statocytes arising from intracellular components such as cytoskeletons significantly affect the complex movements of amyloplasts and the final gravimorphogenesis. In this letter, we implement a diffusive dynamics measurement and inplanta microrheological analysis of amyloplasts in the wild-type plants and actin cytoskeleton mutants for the first time. We found that the intracellular environment of columella cells exhibits the spatial heterogeneity and the cage-confinement on amyloplasts which is the typically characteristics in colloidal suspensions. By comparing the distinct diffusive dynamics of amyloplasts in different types of plants with the behaviors of colloidal systems in different states, we quantitatively characterized the influence of the actin organization dominated intracellular envoronments on the amyloplast movements. Furthermore, the cage-confinement strength was measured by calculating the spatial fluctuation of local apparent viscosity within the columella cells. Finally, a linear association between the initial mechanical stimulation in the columella cells the subsequent intercellular signal transduction and the final gravity response was observed and a possible gravity sensing mechanism was suggested. It suggests the existence of a potential gravity-sensing mechanism that dictates a linear frustration effect of the actin cytoskeleton on the conversion of the mechanical stimulation of amyloplasts into gravitropic signals.
KeywordPlant Gravitropism Gravity Sensing Amyloplasts Columella Cells Microrheology Diffusion Cage-confinement
DOI10.1007/s12217-015-9445-x
URL查看原文
Indexed BySCI ; EI
Language英语
WOS IDWOS:000366103800010
WOS KeywordACTIN CYTOSKELETON ; AUXIN ; GRAVITROPISM ; DISRUPTION ; TRANSPORT ; NETWORKS ; COMPLEX
WOS Research AreaEngineering ; Thermodynamics ; Mechanics
WOS SubjectEngineering, Aerospace ; Thermodynamics ; Mechanics
Funding OrganizationThis work was supported by the National Basic Research Program of China (Grant No. 2011CB710902, 2011CB710901) and NSFC grants 11104286 and 11372314.
DepartmentNML空间材料物理力学
Classification二类/Q2
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://dspace.imech.ac.cn/handle/311007/58367
Collection国家微重力实验室
Corresponding AuthorZheng, ZY (reprint author), Chinese Acad Sci, Key Lab Micrograv, Inst Mech, Beijing 100190, Peoples R China.
Recommended Citation
GB/T 7714
Zheng ZY,Zou JJ,Li HH,et al. Dynamical and Microrheological Analysis of Amyloplasts in the Plant Root Gravity-Sensing Cells[J]. MICROGRAVITY SCIENCE AND TECHNOLOGY,2015,27(6):485-493
APA 郑中玉.,Zou JJ.,Li HH.,Xue S.,Le J.,...&Zheng, ZY .(2015).Dynamical and Microrheological Analysis of Amyloplasts in the Plant Root Gravity-Sensing Cells.MICROGRAVITY SCIENCE AND TECHNOLOGY,27(6),485-493.
MLA 郑中玉,et al."Dynamical and Microrheological Analysis of Amyloplasts in the Plant Root Gravity-Sensing Cells".MICROGRAVITY SCIENCE AND TECHNOLOGY 27.6(2015):485-493.
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