The Distal Part of the Transition Zone Is the Most Aluminum-Sensitive Apical Root Zone of Maize1

Sivaguru, Mayandi; Horst, Walter J.

doi:10.1104/pp.116.1.155

Cited by 335 publications

(255 citation statements)

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“…1D). The shapes of the ATPinduced [Ca 2+ ] cyt signature that we observed were similar to those reported in mammalian cells expressing YC3.60 (Nagai et al, 2004 (Sivaguru and Horst, 1998). Since the toxic species of Al 3+ forms at low pH (Kinraide and Parker, 1987), we prepared a working solution of AlCl 3 in half-strength MS medium at pH 4.5.…”

Section: Fret-sensitized Emissionmentioning

confidence: 52%

“…An additional observation indicating that the early [Ca 2+ ] cyt signatures shown here are not specifically related to Al 3+ toxicity is the fact that [Ca 2+ ] cyt changes were first initiated in the maturation and elongation zones, which are less sensitive to Al 3+ compared with the transition zone (Sivaguru and Horst, 1998;Illéš et al, 2006). This notion is further supported by the fact that alr104 and als3-1 mutants, which were previously shown to be resistant and sensitive to Al 3+ , respectively (Larsen et al, 1998(Larsen et al, , 2005, displayed the same [Ca 2+ ] cyt responses to all three trivalent cations as wild-type seedlings (Fig.…”

Section: Discussionmentioning

confidence: 94%

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Fluorescence Resonance Energy Transfer-Sensitized Emission of Yellow Cameleon 3.60 Reveals Root Zone-Specific Calcium Signatures in Arabidopsis in Response to Aluminum and Other Trivalent Cations

et al. 2010

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Section: Fret-sensitized Emissionmentioning

confidence: 52%

Section: Discussionmentioning

confidence: 94%

Fluorescence Resonance Energy Transfer-Sensitized Emission of Yellow Cameleon 3.60 Reveals Root Zone-Specific Calcium Signatures in Arabidopsis in Response to Aluminum and Other Trivalent Cations

et al. 2010

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“…It plays crucial functions for the perception and response to a range of external factors, as for example mechanical stimuli 42 and aluminum toxicity. [46][47][48][49] This capability seems to be, at least in part, linked to the complex system of a polar auxin transport circuit. 42 Actually, since 1993 it has been evidenced that cells belonging to this zone are strongly auxin-responsive and accomplish dramatic rearrangements of the cytoskeleton, being subjected to a series of fundamental changes in their cytoarchitecture.…”

Section: The Root Transition Zonementioning

confidence: 99%

NO signaling is a key component of the root growth response to nitrate inZea maysL.

Trevisan

Manoli

Quaggiotti

2014

Plant Signaling & Behavior

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To search for nutrients and water, roots need to efficiently explore large soil volumes. To this aim they generate complex root systems, allowing them to maximize their resource allocation efficiency. 1 Despite the vital importance of roots, the difficulty in accessing intact root systems for analysis, particularly under field conditions, have slowed down the breeding programs for plant's adaptation to environmental restrictions. 2,3 The capacity of plants to take up nutrients and water is mainly determined by changes in the architecture of the root system. 1 Three major processes affect the overall architecture of the root system: the rate of cell division, the rate of cell differentiation, and the extent of expansion and elongation of cells. [4][5][6] Disturbs in any of these 3 processes can affect the whole root-system architecture and the capacity of plants to survive and develop in adverse environments (Giehl et al. 7 and references therein).The root system results from the coordinated control of both genetic endogenous programs (regulating growth and organogenesis) and the action of abiotic and biotic environmental stimuli. 8,9 The dynamic control of the overall root system architecture (RSA) throughout time finally determines root plasticity and allows plants to efficiently adapt to environmental constraints. 10 The soil-environment from which plants extract nutrients and water is extremely heterogeneous, both spatially and temporally. 11 Among the nutrients present in soil, nitrate (NO 3 − ) may vary by an order of magnitude within centimeters or over the course of a day. 12 The effects of NO 3 − on the root system are complex and depend on several factors, such as the concentration available to the plant, the endogenous nitrogen status and the sensitivity of the species. 10,13,14 A considerable part of the studies aimed to unravel the mechanisms controlling RSA growth and development in response to nitrate have been focused on lateral roots (LR), 8,13,[15][16][17][18][19][20] while the nitrate-regulation of the primary root growth is still unclear. Beside NO 3 − , auxin has been demonstrated to strongly affect and control the LR development, [21][22][23][24] and an increasing number of studies suggests an overlap between auxin and NO 3 − signaling pathways in controlling LR development. [25][26][27][28][29][30][31][32][33] NO 3 -has a Doubtful Role in Regulating the Growth of Primary RootsDespite the high amount of reports published on nitrate effects on root elongation, the lack of univocal results makes it difficult to clearly decipher this response ( Table 1). In Arabidopsis thaliana, inhibition of primary root growth has been observed when nitrate is applied homogeneously at high concentrations (50 mM) for 7 d, but not in a range between 0.1 and 10 mM. 35 On the contrary, in this same species Linkohr et al. 36 showed an inhibition of primary root elongation with the increase of nitrate concentration already beyond 0.01 mM, but in this case seedlings were IAA, indole-3-acetic acid; SNP, sodium n...

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“…Um dos principais fatores limitantes à produção vegetal em solos ácidos é o predomínio do alumínio na forma trocável (Al 3+ ) (RITCHIE, 1995;VON UEXKÜLL & MUTERT, 1995), sendo que a parte compreendida entre a região meristemática e de elongação das raízes é que parece ser a mais sensível a ação desse íon (SUVAGURU & HORST, 1998). Na célula, o Al 3+ altera as propriedades da parede e da plasmalema, pois afeta o sistema de carregadores de nutrientes, problemas que resultam na inibição da elongação celular do eixo principal, tornando as raízes mais grossas e pouco funcionais (RYAN et al, 1993;KOCHIAN, 1995).…”

Section: Introductionunclassified

Toxidez de alumínio em plântulas de grápia (Apuleia leiocarpa Vog. Macbride)

Fortunato

Nicoloso

2004

Cienc. Rural

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The Distal Part of the Transition Zone Is the Most Aluminum-Sensitive Apical Root Zone of Maize1

Abstract: It is now generally accepted that the root apex plays a major role in the Al-perception and -response mechanisms (for recent reviews, see Delhaize and

Cited by 335 publications

References 40 publications

Fluorescence Resonance Energy Transfer-Sensitized Emission of Yellow Cameleon 3.60 Reveals Root Zone-Specific Calcium Signatures in Arabidopsis in Response to Aluminum and Other Trivalent Cations

Fluorescence Resonance Energy Transfer-Sensitized Emission of Yellow Cameleon 3.60 Reveals Root Zone-Specific Calcium Signatures in Arabidopsis in Response to Aluminum and Other Trivalent Cations

NO signaling is a key component of the root growth response to nitrate inZea maysL.

Toxidez de alumínio em plântulas de grápia (Apuleia leiocarpa Vog. Macbride)

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