root hair


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root hair

[′rüt ‚her]
(botany)
One of the hairlike outgrowths of the root epidermis that function in absorption.
References in periodicals archive ?
The model is based on the transport equation of Nye and Marriot (1969) extended by a term A to take uptake by root hairs into account (Claassen and Steingrobe, 1999):
Schiefelbein, "Hormones act downstream of TTG and GL2 to promote root hair outgrowth during epidermis development in the Arabidopsis root," Plant Cell, vol.
In two separate studies it was observed that arabidiopsis develops unusually short root hairs as they lack the enzymes capable of catalyzing the formation of reactive oxygen species (ROS), which is needed for the normal elongation of root hairs in Arabidopsis [5, 15].
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).
Organic anion release can also increase the availability of soil P (see later discussion); however, the location of organic anion release differs between the 2 mechanisms (Barcelo and Poschenrieder 2002)--for Al-tolerance the organic anions are released from the root tip, and for P deficiency the organic anions are normally released from the root hair zone or from proteoid roots.
In both the squid-vibrio and legume-rhizobia symbioses, within hours of the initial interactions of symbiosis-competent bacteria with host tissues (i.e., either the crypt epithelium of hatchling squid light organs or the zone of susceptible root hairs on the legume), morphological changes are triggered both in the cells with which the bacteria directly associate and in remote tissues.
Table 1: Roundness and flattening of transverse section in root hair zone of vetiver seedling
The root structure from outside to inside consists of root hairs, epidermis, cortical parenchyma, endodermis, peripheral circle, vascular tissue and parenchymal pith in both control groups and treatments but the root hair only exists in the control group (figure 2A).
"We used a known technique for isolating large quantities of root hair cells to explore sorgoleone's chemical pathway and found genes that may encode the compound's enzymes," he says.
It is required for postembryonic root development and root hair development in plants [13,14,15,16,17].
"It's pretty hard to immediately tell the difference between this tiny, threadlike thing and a root hair," says Paul Marek.
Root hair lengths of seedlings that had germinated in 7 d were not different for the main effects or their interactions (P [greater than or equal to] 0.05).