Ion Uptake in Relation to the Development of a Root Hypodermis

Ferguson, I. B.; Clarkson, David T.

doi:10.1111/j.1469-8137.1976.tb01495.x

Cited by 50 publications

(21 citation statements)

References 7 publications

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“…This ion did, therefore, pass through an intact, mature exo-and endodermis. The less efficient radial transport in the old zone (compared to that of the young zone) could be a consequence of the presence of suberin lamellae in both the endo-and exodermis, as similar results were previously obtained with marrow and barley (Harrison-Murray and Clarkson, 1973;Robards et al, 1973;Ferguson and Clarkson, 1976).…”

Section: Sites Of Ca 21 Uptake and Axial Transport Along Onion Rootssupporting

confidence: 74%

Evidence for Symplastic Involvement in the Radial Movement of Calcium in Onion Roots

Cholewa

Peterson

2004

Plant Physiology

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The pathway of Ca2+ movement from the soil solution into the stele of the root is not known with certainty despite a considerable body of literature on the subject. Does this ion cross an intact, mature exodermis and endodermis? If so, is its movement through these layers primarily apoplastic or symplastic? These questions were addressed using onion (Allium cepa) adventitious roots lacking laterals. Radioactive Ca2+ applied to the root tip was not transported to the remainder of the plant, indicating that this ion cannot be supplied to the shoot through this region where the exodermis and endodermis are immature. A more mature zone, in which the endodermal Casparian band was present, delivered 2.67 nmol of Ca2+ mm−1 treated root length d−1 to the transpiration stream, demonstrating that the ion had moved through an intact endodermis. Farther from the root tip, a third zone in which Casparian bands were present in the exodermis as well as the endodermis delivered 0.87 nmol Ca2+ mm−1 root length d−1 to the transpiration stream, proving that the ion had moved through an unbroken exodermis. Compartmental elution analyses indicated that Ca2+ had not diffused through the Casparian bands of the exodermis, and inhibitor studies using La3+ and vanadate (VO4 3−) pointed to a major involvement of the symplast in the radial transport of Ca2+ through the endodermis. It was concluded that in onion roots, the radial movement of Ca2+ through the exodermis and endodermis is primarily symplastic.

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Section: Sites Of Ca 21 Uptake and Axial Transport Along Onion Rootssupporting

confidence: 74%

Evidence for Symplastic Involvement in the Radial Movement of Calcium in Onion Roots

Cholewa

Peterson

2004

Plant Physiology

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“…In the older roots of most monocots and some dicots, the presence of a hypodermis has been demonstrated (8,9,22). In detailed work involving fluorescence microscopy of cell walls and studies on the movement of apoplastic dyes in corn and onion roots, Peterson and coworkers have demonstrated that the hypodermis appears to be an apoplastic barrier to the diffusion of high mol wt dyes which bind to cell walls (22)(23)(24).…”

mentioning

confidence: 99%

Potassium Transport in Corn Roots

Kochian¹,

Lucas²

1983

Plant Physiol.

107

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The relative transport capabilities of the cells of the root periphery and cortex were investigated using a variety of experimental techniques. Brief (30 seconds to 1 minute) exposures with the penetrating sulfhydryl reagent, N-ethyl Corn root cortical protoplasts were isolated, and exhibited significant K+(MRb+) influx. The kinetics for KV uptake were studied; the influx isotherms were smooth, nonsaturating curves that approached linearity at higher Kl(Rb+) concentrations (above I millimolar K). These kinetics were identical in shape to the complex kinetics previously observed for K uptake in corn roots (Kochi-n, Lucas 1982 Plant Physiol 70: 1723-1731), and could be resolved into a saturable and a first order kinetic component.

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“…Lamelas de suberina na endoderme têm sido registradas por diversos autores (Enstone et aI. 2002, Arias & Sánchez 2004, Rodrigues & Estelita 2004, estando envolvida com restrição da translocação radial de íons do córtex para o esteIo (Ferguson & Clarkson 1976). Cabe ressaltar que as estrias são visíveis, em microscopia óptica, somente quando as paredes ainda não apresentam espessamento.…”

Section: Resultsunclassified

Morfoanatomia de raízes adventícias das Reófitas Dyckia brevifolia (Baker) e D. distachya (Hassler) (Bromeliaceae)doi: 10.50007/2178-4574.2008v37p81

Lobo¹,

Voltolini

Reis

et al. 2010

INSULA

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RESUMOReófitas são espécies de plantas que na natureza estão confinadas a leitos de córregos e rios encachoeirados, ao alcance de inundações bruscas regulares. 81 ABSTRACTRheophytes are species of plants that occur in the nature exclusiveiy beside swift-running streams and rivers which experience frequent and sudden floods. This study relate the morphoanatomical characteristics of the Dyckia brevifolia Baker and D. distachya Hassler two species of rheophytes bromeliad that occur at south Brazil. The roots of the two species are similar anatomicaly and they are constituted by ring tissue, cortex and central cylinder. The one-Iayer epidermis with root-hairs further covering. The cortex is constituted by outer parenchyma, sclerenchymatic ring, inner parenchyma and endodermis. The number of.exodermis layers is distinct among these species, it is higher in D. distachya. At the general way, the features find out in the adventiceus roots of D. brevifolia and D. distachya are similar at the others Bromeliaceae species. However, such characteristics must to favor the establishment and survival of these species in the rheophytic environment.

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Ion Uptake in Relation to the Development of a Root Hypodermis

Cited by 50 publications

References 7 publications

Evidence for Symplastic Involvement in the Radial Movement of Calcium in Onion Roots

Evidence for Symplastic Involvement in the Radial Movement of Calcium in Onion Roots

Potassium Transport in Corn Roots

Morfoanatomia de raízes adventícias das Reófitas <I>Dyckia brevifolia</I> (Baker) e <I>D. distachya</I> (Hassler) (Bromeliaceae)<p>doi: 10.50007/2178-4574.2008v37p81

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