Localization of aluminium in the leaves of some aluminium-accumulating species

Haridasan, M.; Paviani, Therezinha Isaia; Schiavini, Ivan

doi:10.1007/bf02374336

Cited by 49 publications

(30 citation statements)

References 4 publications

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“…Haridasan et al (1986) have reported similar Al-distribution in leaf cells of Al-accumulating species of the Brazilian 'Cerrado', but in contrast to our findings (Cuenca and Herrera, 1987) they did not report AI in the xylem vessels. Haridasan (1988) andHaridasan et al (1986) postulate a possible metabolic role for AI in this type of plants.…”

Section: Introductioncontrasting

confidence: 56%

Aluminium tolerance in trees of a tropical cloud forest

1990

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The aluminium tolerance of several tree species was studied in a cloud forest in Northern Venezuela, growing on a very acid soil and rich in soluble A1. The Al-accumulator species (>1000 ppm in leaves) were compared to non-accumulator ones in relation to total AI concentration in xylem sap, pH and A1 concentration in vacuoles, and rhizosphere alkalinization capacity. The AI 3+ concentration in the soil solution and the xylem sap were also measured.The results show that in the Al-accumulator plant Richeria grandis, xylem sap is relatively rich in AI and about 35% of it is present in ionic form. In the non-accumulator plant studied (Guapira olfersiana) there is no A1 detectable in xylem sap. The pH of vacuolar sap of several Al-accumulator species studied was very acidic and ranged between 2.6-4.8, but the presence of AI in vacuoles was not correlated with the acidity of the vacuolar sap.Both Al-accumulator and non accumulator plants had the capacity to reduce acidity of the rhizosphere and increased the pH of the nutrient solution by one unit within the first 24 hours.Trees growing in natural, high acidity-high A13÷ environment show a series of tolerance mechanisms, such as deposition of AI in vacuoles, AI chelation and rhizosphere alkalinization. These partially ameliorate the toxic effects of this element, but they probably impose a high ecological cost in terms of photosynthate allocation and growth rate.

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Section: Introductioncontrasting

confidence: 56%

Aluminium tolerance in trees of a tropical cloud forest

1990

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“…No co-localization was seen with P or the other elements measured here, which is in line with reports on Al transport via the xylem as a complex bound to organic acids, such as citrate in tea plants (Morita et al 2004). More than 20 years ago, simple haematoxylin staining procedures had already shown the specific location of Al in the phloem tissue of Al-accumulating species from the Brazilian Cerrado region (Haridasan et al 1986). Here, this specific localization of Al in the phloem tissue is thus finally confirmed in the Al-accumulating tea plant using a sample preparation technique that avoids retranslocation of the elements during the sample preparation procedure.…”

Section: Resultsmentioning

confidence: 97%

Localization of aluminium in tea (Camellia sinensis) leaves using low energy X-ray fluorescence spectro-microscopy

et al. 2010

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Information on localization of Al in tea leaf tissues is required in order to better understand Al tolerance mechanism in this Al-accumulating plant species. Here, we have used low-energy X-ray fluorescence spectro-microscopy (LEXRF) to study localization of Al and other low Z-elements, namely C, O, Mg, Si and P, in fully developed leaves of the tea plant [Camellia sinensis (L.) O. Kuntze]. Plants were grown from seeds for 3 months in a hydroponic solution, and then exposed to 200 microM AlCl(3) for 2 weeks. Epidermal-mesophyll and xylem phloem regions of 20 microm thick cryo-fixed freeze-dried tea-leaf cross-sections were raster scanned with 1.7 and 2.2 keV excitation energies to reach the Al-K and P-K absorption edges. Al was mainly localized in the cell walls of the leaf epidermal cells, while almost no Al signal was obtained from the leaf symplast. The results suggest that the retention of Al in epidermal leaf apoplast represent the main tolerance mechanism to Al in tea plants. In addition LEXRF proved to be a powerful tool for localization of Al in plant tissues, which can help in our understanding of the processes of Al uptake, transport and tolerance in plants.

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“…Bases and P were present in low concentrations in the three sites and soils showed a high proportion of sand as had been reported for other sites of the region (Ramirez et al, 2007). Haridasan et al (1986) showed Al sequestration in the cell wall of Miconia albicans, however, no information is available about Al-resistance mechanisms in the other species analyzed in the present work. The Al concentration was similar in Miconia lepidota from the shrubland and the forest according to the t-test (p = 0.571), even though the soil Al concentration in the shrubland was higher than that in the forest.…”

Section: Chemical Analysis Of Soils From the Three Plant Formationsmentioning

confidence: 71%

Aluminum accumulation in nineteen Melastomataceae species from three contrasting plant formations in acid soils

Olivares

Colonnello²,

Peña

et al. 2010

Z. Pflanzenernähr. Bodenk.

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This study describes the aluminum (Al) accumulation in relation to macronutrient and micronutrient elements in 19 Melastomataceae species in the Guayana Region in Venezuela. The purpose was to investigate the Al accumulation in four tribes and different life forms. Aluminum accumulation was predicted in the basal tribes Miconieae and Merianieae in contrast to the derived tribes and herbs from any tribe, which generally do not accumulate Al. The survey was done in a vegetation continuum, which includes a savanna shrubland, a palm-swamp community, and an evergreen forest in the Guayana region in southeastern Venezuela. The highest value of soil Al concentration was found in the savanna shrubland, where ten lignified Miconiae and one Merianeae Al accumulators were present. At the forest, the site with highest soil acidity, four Al-accumulator tree species from Miconiae were found. Miconia lepidota showed similar Al foliar concentrations in the savanna shrubland and forest, but foliar Ca was lower in the forest, even though it was the site with highest Ca in the soil. At the palm-swamp community, the Melastomeae shrub Macairea pachyphylla was found with an Al concentration of 0.59 g kg -1 in leaves and 0.16 g kg -1 in bark. At the same site, Al accumulation occurred in one Microlicieae species, one Miconieae species, and in the Melastomeae herbs Pterogastra divaricata

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Localization of aluminium in the leaves of some aluminium-accumulating species

Cited by 49 publications

References 4 publications

Aluminium tolerance in trees of a tropical cloud forest

Aluminium tolerance in trees of a tropical cloud forest

Localization of aluminium in tea (Camellia sinensis) leaves using low energy X-ray fluorescence spectro-microscopy

Aluminum accumulation in nineteen Melastomataceae species from three contrasting plant formations in acid soils

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