Journal ArticleDOI
Root Cap and Georeaction
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The Juniper et al. finding that removing the cap prevented the perception of the gravitational stimulus although the root continued to elongate suggested that the root cap might be the site of geoperception and the source of growth regulating compounds.Abstract:
THE clear boundary1 between the cap and root proper in maize, enable assays such as those of Juniper et al.2 to be made. They found that removing the cap (decapping) prevented the perception of the gravitational stimulus although the root continued to elongate3; geosensitivity is regained when the cap is regenerated by the cap meristem. This suggested that the root cap might be the site of geoperception4–6 and the source of growth regulating compounds7.read more
Citations
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Journal ArticleDOI
Amyloplast sedimentation dynamics in maize columella cells support a new model for the gravity-sensing apparatus of roots.
TL;DR: A new, tensegrity-based model of gravity sensing in columella cells is formulated that envisages the cytoplasm as pervaded by an actin-based cytoskeletal network that is denser in the ER-devoid central region than in theER-rich cell cortex and is linked to stretch receptors in the plasma membrane.
Journal ArticleDOI
Root Apex Transition Zone As Oscillatory Zone
TL;DR: The oscillatory nature of the transition zone which is interpolated between the apical meristem and the subapical elongation zone is discussed, which suggests that it acts as some kind of command center of higher plants.
Journal ArticleDOI
Gas chromatography-mass spectrometric determinations of abscisic acid levels in the cap and the apex of maize roots.
L. Rivier,H. Milon,P. E. Pilet +2 more
TL;DR: Quantitative analyses of abscisic acid in different parts of maize root tips were performed by mass fragmentography using the hexadeuterated analog of ABA as internal standard, finding that the cap and the apex contained 36.1 μg and 66.5 μg ABA kg−1 fresh weight, respectively.
Journal ArticleDOI
The Root Cap: Cell Dynamics, Cell Differentiation and Cap Function
TL;DR: The structure and functional interrelationships between the root and the cap which surmounts it are considered, and also the means by which the cap transduces the environmental signals that are of critical importance for the growth of the individual roots, and collectively for the shaping of the root system.
Book ChapterDOI
Growth Inhibitors in Growing and Geostimulated Maize Roots
TL;DR: The root cap of maize produces or releases growth-inhibiting substances (one of which could be abscisic acid) as mentioned in this paper, and removing the cap increased the root growth velocity, but only for the first hours after decapping.
References
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Journal ArticleDOI
Root Cap and the Perception of Gravity
TL;DR: In this article, it was shown that it is possible to remove the intact root cap cleanly from the rest of the root tip, and that the root can be removed from other species such as broad bean or pea.
Journal ArticleDOI
Growth inhibitor production by root caps in relation to geotropic responses.
TL;DR: It is found that removing the cap abolished the downward curvature of horizontally placed roots even though the roots continued to elongate, suggesting that the root cap might be the site of the graviperception mechanism, or the source of growth regulating substances involved in the geotropic response.
Journal ArticleDOI
The fine structure of the cells that perceive gravity in the root tip of maize
B. E. Juniper,Anna French +1 more
TL;DR: Within the root cap, in maize, the cells believed to be responsible for the perception all possess large well-developed amyloplasts and have normal mitochondria and Golgi bodies, normal rough-surfaced ER with a very striking pattern of distribution and an as yet unidentified fine quadruple membranous system.
Journal ArticleDOI
The significance of the root cap for geotropism
TL;DR: It is concluded from the results presented in this and a previous paper that the part of the root cap between 0.2 and 0.5 mm from the apex, where the starch-containing columella cells are localized, controls both geotropism and the lateral distribution of auxin.
Related Papers (5)
Growth inhibitor production by root caps in relation to geotropic responses.
The source and lateral transport of growth inhibitors in geotropically stimulated roots of Zea mays and Pisum sativum.
Stanley Shaw,Malcolm B. Wilkins +1 more