gravitropism


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gravitropism

(grə-vĭt′rə-pĭz′əm)
n.
Growth or movement of a sessile organism in response to gravity, as the downward growth of plant roots. Also called geotropism.

grav′i·tro′pic (grăv′ĭ-trō′pĭk) adj.

gravitropism

(formerly
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References in periodicals archive ?
A mutant RM109 of rice (Oryza sativa L.) exhibiting altered lateral root initiation and gravitropism. Japanese J.
IDENTIFICATION OF NEW COMPONENTS INVOLVED IN SHOOT GRAVITROPISM IN ARABIDOPSIS THALIANA.
Role of cytokinin and auxin in shaping root architecture: regulating vascular differentiation, lateral root initiation root apical dominance and root gravitropism. Annals of Botany., 97: 883-893.
The papers in between discuss the relationship of other tropisms to gravitropism, auxin transport, single-cell systems as model organisms, light perception, moisture gradients, and touch sensing mechanisms.
This population has been used to analyze other LP adaptation traits such as root hair density, acid exudation, and basal root gravitropism (Liao et al., 2004; Yan et al., 2004).
He wrote The Power of Movement in Plants (1880), in which he described for the first time the ability of plants to move in response to gravity (gravitropism) and light (phototropism).
(2000), however, discussed how root architecture is principally controlled by gravitropism, where gravitropism determines the depth at which laterals form.
One option for an active gravireceptor is an intracellular statolith exerting pressure on a sensor, as has been proposed for gravitropism in higher plants.
While there are a number of long-appreciated examples of gravitropism involving intact higher plants (Larsen, 1962; Firn & Myers, 1987; Salisbury, 1993) and higher fungi (Moore, 1991), and even explanted organs such as the pulvini of grasses (Kaufman et al., 1995), that may be identified as candidate test systems for studying differences after exposure to changes in gravity, there is relatively little known about cells outside the plant body (Moroz, 1984; Todd, 1989, 1991).
Cytokinin and auxin are key hormones that regulate root development, vascular tissue differentiation and root gravitropism; together with ethylene, these hormones also regulate secondary root initiation (ALONI et al., 2006; FUKAKI; TASAKA, 2009).
Studies with the auxin-responsive promoter, GH3, in root gravitropism and lateral root development.
In Arabidopsis, among its many functions SCR is essential the maintenance of root meristem, the development of root and shoot endodermis and for normal shoot gravitropism. As a result, ser mutants exhibit many phenotypic defects relating to these functions such as, short roots, short hypocotyls, small leaves, shoot agravitropism as well as cell layer deletions in both roots and shoots.