Aluminum tolerance and aluminum-induced deposition of callose and lignin in the root tips of <i>Melaleuca</i> and <i>Eucalyptus</i> species

Tahara, Ko; Norisada, Mariko; Hogetsu, Taizo; Kojima, Kôhei

doi:10.1007/s10310-005-0153-z

Cited by 55 publications

(48 citation statements)

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“…A long-term experiment revealed no growth inhibition of camphor tree seedlings after 4 months of exposure to 5 mM Al in a nutrient solution (Oda and Yamamoto, 2002). Meanwhile, studies of the multipurpose trees Acacia mangium and Melaleuca cajuputi, both of which are used for afforesting degraded lands in the tropics, support the idea that some woody plants exhibit extraordinary Al tolerance with a modest release of organic anions (Tahara et al, 2005;Osawa and Kojima, 2006). A better understanding of high Al tolerance mechanisms in woody plants could provide the basis for introducing highly Al-tolerant plants to marginal lands with strongly acidic soils.…”

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confidence: 73%

Transient Proliferation of Proanthocyanidin-Accumulating Cells on the Epidermal Apex Contributes to Highly Aluminum-Resistant Root Elongation in Camphor Tree

et al. 2010

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Aluminum (Al) is a harmful element that rapidly inhibits the elongation of plant roots in acidic soils. The release of organic anions explains Al resistance in annual crops, but the mechanisms that are responsible for superior Al resistance in some woody plants remain unclear. We examined cell properties at the surface layer of the root apex in the camphor tree (Cinnamomum camphora) to understand its high Al resistance mechanism. Exposure to 500 mM Al for 8 d, more than 20-fold higher concentration and longer duration than what soybean (Glycine max) can tolerate, only reduced root elongation in the camphor tree to 64% of the control despite the slight induction of citrate release. In addition, Al content in the root apices was maintained at low levels. Histochemical profiling revealed that proanthocyanidin (PA)-accumulating cells were present at the adjacent outer layer of epidermis cells at the root apex, having distinctive zones for cell division and the early phase of cell expansion. Then the PA cells were gradually detached off the root, leaving thin debris behind, and the root surface was replaced with the elongating epidermis cells at the 3-to 4-mm region behind the tip. Al did not affect the proliferation of PA cells or epidermis cells, except for the delay in the start of expansion and the accelerated detachment of the former. In soybean roots, the innermost lateral root cap cells were absent in both PA accumulation and active cell division and failed to protect the epidermal cell expansion at 25 mM Al. These results suggest that transient proliferation and detachment of PA cells may facilitate the expansion of epidermis cells away from Al during root elongation in camphor tree.

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confidence: 73%

Transient Proliferation of Proanthocyanidin-Accumulating Cells on the Epidermal Apex Contributes to Highly Aluminum-Resistant Root Elongation in Camphor Tree

et al. 2010

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“…Cell wall thickening has been related to the accumulation of Al [7], deposition of callose [10,11], pectins [12], and also lignin in the most sensitive species [13]. Hydroxyprolinerich glycoprotein accumulation also resulted in thicker cell walls [14].…”

Section: Introductionmentioning

confidence: 99%

Cellular responses of two Latin-American cultivars of Lotus corniculatus to low pH and Al stress

Paľove-Balang¹,

Čiamporová

Zelinová

et al. 2012

Open Life Sciences

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Toxic effects of acidic root medium and aluminium were evaluated in two forage cultivars of Lotus corniculatus differing in their tolerance to Al stress. The structural response of most of the root cells exposed to low pH without Al 3+ differed markedly from that induced by the combined stress. Conspicuous alteration of the nucleus was present only at low pH 4.0 and disintegration of the cytoplasmic components was more drastic than in the roots exposed to acidic solution containing Al 3+ . Cells exposed to low pH without Al, did not produce wall thickenings. Severely damaged cytoplasm and localized death in some cortical cells or groups of cells contrasting with almost intact cells exposed to Al 3+ stress were found. In this respect, a strong correlation between the occurrence of cell wall thickenings and a better preserved structure of the cytoplasm was observed. The frequency of cell damage in the more tolerant cultivar UFRGS was generally lower, significantly more cortical cells capable of maintaining their resting membrane potential were present than in the sensitive INIA Draco. The difference in their tolerance is related rather to the exudation of citrate and oxalate that was higher in UFRGS than to the accumulation of tannins, which increased after Al treatment in both cultivars.

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“…It was also observed that among Eucalyptus species, E. grandis and E. cloezina were the most susceptible to Alinduced damage. For E. camaldulensis, a reduction in the root growth rate has been observed after only 24h of exposure to 1 mM Al (Nguyen et al 2003, Tahara et al 2005). However, growth was shown to be normal after 20 days of Al exposure (Tahara et al 2005).…”

Section: Resultsmentioning

confidence: 99%

“…For E. camaldulensis, a reduction in the root growth rate has been observed after only 24h of exposure to 1 mM Al (Nguyen et al 2003, Tahara et al 2005). However, growth was shown to be normal after 20 days of Al exposure (Tahara et al 2005). Tahara et al (2008) in another report observed that the root growth inhibition of E. camaldulensis occurred after five days of exposure to 1 mM Al and according to these same authors the growth recovery shown by E. camaldulensis when exposed to 1 mM Al likely occurred between five and 20 days, whereas in the present study, the hybrid E. grandis × E. camaldulensis exhibited growth recovery after treatment with 100 µM Al between 24 and 48h.…”

Section: Resultsmentioning

confidence: 99%

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Temporal dynamics of the response to Al stress in Eucalyptus grandis × Eucalyptus camaldulensis

Alcântara¹,

Pizzaia²,

Piotto³

et al. 2015

An. Acad. Bras. Ciênc.

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Lipid peroxidation and root elongation of Eucalyptus grandis × Eucalyptus camaldulensis were studied under stress conditions in response to aluminum (Al), a metal known to limit agricultural productivity in acidic soils primarily due to reduced root elongation. In Brazil, the Grancam 1277 hybrid (E. grandis × E. camaldulensis) has been planted in the "Cerrado", a region of the country with a wide occurrence of acidic soils. The present study demonstrated that the hybrid exhibited root growth reduction and increased levels of lipid peroxidation after 24h of treatment with 100 µM of Al, which was followed by a reduction in lipid peroxidation levels and the recovery of root elongation after 48h of Al exposure, suggesting a rapid response to the early stressful conditions induced by Al. The understanding of the temporal dynamics of Al tolerance may be useful for selecting more tolerant genotypes and for identifying genes of interest for applications in bioengineering.

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Aluminum tolerance and aluminum-induced deposition of callose and lignin in the root tips of Melaleuca and Eucalyptus species

Cited by 55 publications

References 48 publications

Transient Proliferation of Proanthocyanidin-Accumulating Cells on the Epidermal Apex Contributes to Highly Aluminum-Resistant Root Elongation in Camphor Tree

Transient Proliferation of Proanthocyanidin-Accumulating Cells on the Epidermal Apex Contributes to Highly Aluminum-Resistant Root Elongation in Camphor Tree

Cellular responses of two Latin-American cultivars of Lotus corniculatus to low pH and Al stress

Temporal dynamics of the response to Al stress in Eucalyptus grandis × Eucalyptus camaldulensis

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