Studies on Roots. Iii. An Analysis of Root Growth in Phleum Pratense Using Photomicrographic Records

Goodwin, Richard H.; Avers, Charlotte J.

doi:10.1002/j.1537-2197.1956.tb10521.x

Cited by 84 publications

(31 citation statements)

References 11 publications

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“…Some evidence of Hofer et al (1976) suggests that at the upper surface : of geotropic Z. mays roots, in addition to an accelera-; tion of growth rate, there is also a lengthening of the \ growth zone. A complete description of extension j growth and cell formation rates during geotropism ' ; could come from careful photographic records of the surfaces of geostimulated roots (cf., Goodwin and Avers 1956), but these have yet to be performed.…”

Section: Discussionmentioning

confidence: 99%

Mitotic activity and cell elongation in geostimulated roots of Zea mays

Barlow

Hofer²

1982

Physiologia Plantarum

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Mitotic activity was investigated in the primary meristem of horizontally oriented excised root tips of Zea mays during the first six hours of their georeaction. The only statistically significant change that could be detected in the meristem was a decrease of the length of its upper half. No significant difference in mitotic activity was found between the upper and lower halves of roots kept continuously horizontal for 6 h. Cell proliferation thus seems relatively insensitive to changes in the redistribution of endogenous growth regulators that are believed to occur within the meristem during the onset of geotropism. In the zone of bending proximal to the meristem cell length was significantly greater in the upper half than in either the lower half or in the equivalent position in vertical control roots. Thus, cell elongation seems to be promoted in the upper half of the horizontal root. Thus, The differences in cell length were not accompanied by any change in the proportion of nuclei synthesising DNA in these elongating, non‐meristematic cells.

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Section: Discussionmentioning

confidence: 99%

Mitotic activity and cell elongation in geostimulated roots of Zea mays

Barlow

Hofer²

1982

Physiologia Plantarum

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“…The root tip meristem was the first system to be investigated quantitatively by means of kinematic analysis in photomicrographic studies of epidermal cells (Goodwin and Stepka, 1945;Goodwin and Avers, 1956;Erickson and Sax, 1956). These cells are typically organized in parallel files along which one-dimensional developmental gradients are present (Figure 3; Dolan et al, 1993).…”

Section: Numerical Methods For the Analysis Of Root Tipsmentioning

confidence: 99%

Quantitative Analyses of Cell Division in Plants

Fiorani

Beemster

2006

Plant Mol Biol

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At the molecular level regulatory interactions between cell cycle genes are being uncovered rapidly, but less progress is made in unravelling how these molecular events regulate growth processes at the level of cells and of the whole organism. The main obstacle is the absence of a set of analytical tools that are powerful enough to determine pertinent parameters and, at the same time, relatively easy to use by non-specialized laboratories. Appropriate methodology to obtain this type of data has been pioneered in the first half of the last century and is now commonly defined as 'kinematic analysis'. Unfortunately, the laborious nature of these analyses and the relatively complex numerical methods used, have limited their use to only a handful of specialized research groups. In this article we attempt to present an accessible entry to this methodology, particularly in terms of the mathematical framework. We start describing the simplest possible system, i.e., a virtually homogenous cell suspension culture. Then, we outline the analysis of dicotyledonous leaves, root tips, monocotyledonous leaves, and finally shoot apical meristems. For each of these systems we discuss the details of the calculation of cell division parameters such as cell cycle duration, size of the meristem and number of cells contained in it, which enables answering fundamental questions about the relative contribution of differences in cell production and cell size to variation in growth. In addition, we discuss the assumptions and limitations of these and alternative methodologies with the aim to facilitate the choice of appropriate analyses depending on the specific research question.

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“…Root hair cells develop from trichoblasts, and hairless epidermal cells develop from atrichoblasts (Leavitt, 1904;Row & Reeder, 1957;Sinnott & Bloch, 2011). In some species, such as Brachypodium distachyon and many other members of the Pooideae subfamily, trichoblasts and atrichoblasts are formed by the division of an epidermal cell that is accompanied by an asymmetric mitosis that forms daughter cells that differ in size (Goodwin & Avers, 1956;Row & Reeder, 1957;Kim & Dolan, 2011; reviewed by Marzec et al, 2015). The smaller daughter is a trichoblast and differentiates as a root hair cell while the larger forms an atrichoblast and differentiates as a hairless epidermal cell.…”

Section: Introductionmentioning

confidence: 99%

RSL class I genes positively regulate root hair development in Oryza sativa

2016

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SummaryRoot hairs are filamentous protuberances from superficial cells of plant roots that are critical for nutrient uptake. Genes encoding ROOT HAIR DEFECTIVE-SIX LIKE (RSL) class I basic helix-loop-helix proteins are expressed in future root hair cells (trichoblasts) of the Arabidopsis thaliana root where they positively regulate root hair cell development.We characterized the function of class I genes in Oryza sativa root development. We show that there are three RSL class I genes in O. sativa and that each is expressed in developing root hair cells. Reduction of RSL class I function results in the development of shorter root hairs than in wild-type. Ectopic overexpression results in the development of ectopic root hair cells.These data suggest that expression of individual RSL class I proteins is sufficient for root hair development in the cereal O. sativa (rice). Therefore RSL class I genes have been conserved since O. sativa and A. thaliana last shared a common ancestor. However, given that RSL class I genes are not sufficient for root hair development in A. thaliana, it suggests that there are differences in the mechanisms repressing RSL class I gene activity between members of the Poaceae and Brassicaceae.

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Studies on Roots. Iii. An Analysis of Root Growth in Phleum Pratense Using Photomicrographic Records

Cited by 84 publications

References 11 publications

Mitotic activity and cell elongation in geostimulated roots of Zea mays

Mitotic activity and cell elongation in geostimulated roots of Zea mays

Quantitative Analyses of Cell Division in Plants

RSL class I genes positively regulate root hair development in Oryza sativa

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