Uptake and Binding of Uranyl Ions by Barley Roots

Robards, A. W.; Robb, Marlene E.

doi:10.1126/science.178.4064.980

Cited by 72 publications

(25 citation statements)

References 4 publications

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“…Once inside the central cylinder, nanoparticles can move toward the aerial part though the xylem, following the transpiration stream (Cifuentes et al, 2010;Larue et al, 2012;Wang et al, 2012;Sun et al, 2014). Nevertheless, reaching the xylem through the root implies crossing a barrier to the apoplastic pathway, the Casparian strip, which must be done following a symplastic way (Robards and Robb, 1972) via endodermal cells. Indeed, some nanomaterials can be stopped and accumulated at the Casparian strip (Larue et al, 2012;Sun et al, 2014;Lv et al, 2015).…”

Section: Movement Of Nanoparticles Inside Plantsmentioning

confidence: 99%

Interaction of Nanomaterials with Plants: What Do We Need for Real Applications in Agriculture?

Pérez‐de‐Luque

2017

Front. Environ. Sci.

465

186

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The number of published researching works related with applications of nanomaterials in agriculture is increasing every year. Most of such works focus on the synthesis of nanodevices, their characteristics as nanocarriers for controlled release of active substances, and their interaction (either positive or negative) with plants or microorganisms under controlled conditions. Important knowledge has been gained about the uptake and distribution of nanomaterials in plants, although there are still gaps regarding internalization inside plant cells. Nanoparticle traits and plant species greatly affect the interaction, and nanodevices can enter and move through different pathways (apoplast vs. symplast), what influences their effectiveness and their final fate. Depending on the effect we are expecting for a nanocarrier, the application method might be critical. However, in order to get that research used in the field, some problems must be addressed. First, the cost for escalating the production of nanodevices must be affordable with the current production cost of agricultural goods. Second, we need to be sure that a technology is safe before spreading it into the environment. Third, consumers will distrust a technology unfamiliar for them in the same way that happened with transgenic crops. We need to broaden our horizons and start looking for real practical approaches, filling the main gaps that hamper our jump from laboratory research into field applications.

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Section: Movement Of Nanoparticles Inside Plantsmentioning

confidence: 99%

Interaction of Nanomaterials with Plants: What Do We Need for Real Applications in Agriculture?

Pérez‐de‐Luque

2017

Front. Environ. Sci.

465

186

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“…Suberin lamella deposition and Casparian strip formation in the endodermis and exodermis (a layer of hypodermal cells adjacent to the epidermis) have been studied extensively in the roots of many plant species, particularly fruit trees, such as pear (Esau, 1943), apple (Mackenzie, 1979;Riedhart and Guard, 1957), loquat (Nii et al, 2004;Pan et al, 2006), grapevine (Song et al, 2011a), and red bayberry (Song et al, 2011b). The Casparian strip has been shown to block the free apoplast movement of water, ions, heavy metals, and fluorescent dyes (Bücking et al, 2002;Nagahashi et al, 1974;Peterson et al, 1981;Robards and Robb, 1972). Nii et al (2004) and Pan et al (2006) reappraised cell wall growth (phi thickening) in the cortical cells of loquat (Rosaceae) tree roots.…”

Section: Introductionmentioning

confidence: 99%

Formation of Endodermis-like Cells with Casparian Strip and Thick Wall Cells Derived from Pericycle in the Roots of Feijoa sellowiana (Myrtaceae)

Nii

Ohtsuka

et al. 2012

J. Japan. Soc. Hort. Sci.

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Two anatomical features of cells derived from the pericycle of the roots of Feijoa sellowiana are reported: (1) appearance of endodermis-like cell layer with a Casparian strip, which was confirmed by histological examination; (2) occurrence of a thick wall cell between endodermis-like cells. These features were considered to develop as follows: two tangential cell walls appeared successively in the pericycle cells, resulting in the formation of three cell layers. The walls of the cells of the outer layer, adjacent to the endodermis, became thicker on the interior side of the cell and heavily encrusted with lignin. The walls of the cells in the middle layer derived from the pericycle became suberized and developed into Casparian strips. These cells subsequently developed into endodermis-like cells. The innermost cell layer derived from the pericycle retained their original morphology for a while, but again divided tangentially and developed as mentioned above. Consequently, in aged roots, there were several layers, in which endodermis-like cells with Casparian strips alternated with cells with thick inner walls. The tangential width of endodermis-like cells reduced in sequence from the outer to inner layer. It is quite important to know how the anatomical features of feijoa trees appear under different soil conditions.

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“…The argument against this view is that Casparian bands of the endodermis and exodermis have proved impermeable to several ions (de Rufz de Lavison, 1910;Baker, 1971;Robards and Robb, 1972;Peterson, 1987; including Ca 21 (Singh and Jacobson, 1977, Kuhn et al, 2000, Bü ckling et al, 2002 within the limits of the tests employed.…”

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confidence: 99%

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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Uptake and Binding of Uranyl Ions by Barley Roots

Cited by 72 publications

References 4 publications

Interaction of Nanomaterials with Plants: What Do We Need for Real Applications in Agriculture?

Interaction of Nanomaterials with Plants: What Do We Need for Real Applications in Agriculture?

Formation of Endodermis-like Cells with Casparian Strip and Thick Wall Cells Derived from Pericycle in the Roots of Feijoa sellowiana (Myrtaceae)

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

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