Some aspects of aluminum toxicity in plants

Roy, A. K.; Sharma, Archana; Talukder, Geeta

doi:10.1007/bf02858527

Cited by 162 publications

(99 citation statements)

References 148 publications

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“…Nuclear aberrations, micronuclei and binuclear cells have been also recorded (Roy et al, 1988(Roy et al, , 1989Zhang, 1995). The effect of Al on cell division has also been correlated with DNA synthesis.…”

Section: mentioning

confidence: 90%

Aluminium effects on microtubule organization in dividing root‐tip cells of Triticum turgidum. I. Mitotic cells

2000

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The effects of aluminium (Al) on dividing root-tip cells of Triticum turgidum were investigated with tubulin immunolabelling and electron microscopy. Aluminium affects the mechanisms controlling the organization of microtubule (MT) cytoskeleton, as well as tubulin polymerization, and induces the following aberrations in mitotic cells. (1) It delays the MT disassembly during mitosis, resulting in the persistence of preprophase MT bands in the late prophase cells, the presence of prophase spindles in prometaphase cells, and a disturbance in the shortening of kinetochore MT bundles in anaphase cells. (2) It interferes with the self-organization process of MTs into bipolar systems, inhibiting the formation of prophase and metaphase spindles. (3) Aluminium induces the formation of atypical MT arrays, which in the immunofluorescent specimens appear as ring-like tubulin aggregations in the cortical cytoplasm of the preprophase\prophase cells and as endoplasmic tubulin bundles in prophase and metaphase\anaphase cells ; abnormal preprophase MT bands are assembled, consisting of atypical cortical and endoplasmic MT bundles, the latter clearly lining the nuclear envelope on the preprophase MT band plane. (4) It disorders the chromosome movements carried out by the mitotic spindle. In addition, after prolonged Al treatments chromatin condensation is inhibited. The outcome is greatly disturbed organization and function of the mitotic apparatus, as well as inhibition of cells from entering mitosis. This study shows that the MT cytoskeleton is a target site of Al toxicity in mitotic root-tip cells of T. turgidum. The possible mechanisms by which Al exerts its toxicity on MT organization and function are discussed.

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Section: mentioning

confidence: 90%

Aluminium effects on microtubule organization in dividing root‐tip cells of Triticum turgidum. I. Mitotic cells

2000

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“…No entanto, pouca atenção tem sido dada à presença de elementos tóxicos no meio que serve de substrato para as sementes. O alumínio é um elemento que se torna disponível em condições de pH baixo, sendo que, em solo ácido, o elemento solubilizase em Al 3+ , exercendo efeito tóxico sobre a germinação e o desenvolvimento das espécies vegetais (ROUT et al, 2001;CUSTÓDIO et al, 2002 (ROY et al, 1988;SOUZA FILHO & DUTRA, 1998).…”

Section: Introductionunclassified

Germinação de sementes de Conyza canadensis e C. bonariensis em função da presença de alumínio no substrato

Yamashita

Guimarães

2011

Cienc. Rural

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“…1193 (5,30,32), it is unclear whether any represent primary responses to Al toxicity. An early and dramatic symptom of Al phytotoxicity is inhibition of root growth, and with extended exposure (days), the roots thicken and become stubby and darker in color.…”

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confidence: 99%

Aluminum Toxicity in Roots

Ryan

Shaff²,

Kochian³

1992

Plant Physiol.

106

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The inhibition of root growth by aluminum (Al) is well established, yet a unifying mechanism for Al toxicity remains unclear.The association between cell growth and endogenously generated ionic currents measured in many different systems, including plant roots, suggests that these currents may be directing growth. A vibrating voltage microelectrode system was used to measure the net ionic currents at the apex of wheat (Triticum aestivum L.) roots from Al-tolerant and Al-sensitive cultivars. We examined the relationship between these currents and Al-induced inhibition of root growth. In the Al-sensitive cultivar, Scout 66, 10 micromolar Al (pH 4.5) began to inhibit the net current and root elongation within 1 to 3 hours. These changes occurred concurrently in 75% of experiments. A significant correlation was found between current magnitude and the rate of root growth when data were pooled. No changes in either current magnitude or growth rate were observed in similar experiments using the Al-tolerant cultivar Atlas 66. Measurements with ion-selective microelectrodes suggested that H' influx was responsible for most of the current at the apex, with smaller contributions from Ca2" and Cl fluxes. In 50% of experiments, Al began to inhibit the net Ho influx in Scout 66 roots at the same time that growth was affected. However, in more than 25% of cases, Al-induced inhibition of growth rate occurred before any sustained decrease in the current or H' flux. Although showing a correlation between growth and current or H' fluxes, these data do not suggest a mechanistic association between these processes.We conclude that the inhibition of root growth by Al is not caused by the reduction in current or H' influx at the root apex.Al2 toxicity has been identified as one of the most important factors limiting plant growth in acid soils (5). Although a wide range of Al-related effects have been described in plants ' P.R.R.

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Some aspects of aluminum toxicity in plants

Cited by 162 publications

References 148 publications

Aluminium effects on microtubule organization in dividing root‐tip cells of Triticum turgidum. I. Mitotic cells

Aluminium effects on microtubule organization in dividing root‐tip cells of Triticum turgidum. I. Mitotic cells

Germinação de sementes de Conyza canadensis e C. bonariensis em função da presença de alumínio no substrato

Aluminum Toxicity in Roots

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