Review Genetic and molecular mechanisms of aluminum tolerance in plants

Simoes, Christiano C; Melo, Janaína de Oliveira; Magalhães, J. V. de; Guimarães, C. T.

doi:10.4238/2012.july.19.14

Cited by 40 publications

(25 citation statements)

References 59 publications

(98 reference statements)

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“…In the tolerance mechanism, after Al enters the cytoplasm, it is also complexed with organic acids, such as citrate, and then either transferred out across the plasmalemma or deposited into the vacuole via the tonoplast (Kochian et al, 2004(Kochian et al, , 2005Simões et al, 2012). In addition, Al toxicity can be partly alleviated by either salicylic acid or Mg 2þ or Ca 2þ as shown in lab experiments (Pandey et al, 2013).…”

Section: Aluminium Toxicitymentioning

confidence: 87%

“…In addition, Al toxicity can be partly alleviated by either salicylic acid or Mg 2þ or Ca 2þ as shown in lab experiments (Pandey et al, 2013). Substantial progress (reviewed by Simões et al, 2012) has recently been achieved in characterizing organic acid transporters involved in Al tolerance of plants, such as aluminium-activated malate transporters (ALMT genes) and multidrug and toxic compound extrusion proteins (MATE family). Other candidates presumably involved in Al-tolerance of plants are members of the ATP-binding cassette (ABC) and Nramp transporter families.…”

Section: Aluminium Toxicitymentioning

confidence: 95%

“…Al resistance of plants can be achieved either by the avoidance of the uptake (exclusion mechanism) or by internal tolerance (protoplastic tolerance) (Barcel o and Poschenrieder, 2002; Kochian al., 2005;Simões et al, 2012). In the avoidance mechanism, plants excrete carboxylic acids into the soils, which effectively bind Al.…”

Section: Aluminium Toxicitymentioning

confidence: 99%

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The lime–silicate question

Bothe

2015

Soil Biology and Biochemistry

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Section: Aluminium Toxicitymentioning

confidence: 87%

Section: Aluminium Toxicitymentioning

confidence: 95%

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The lime–silicate question

Bothe

2015

Soil Biology and Biochemistry

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“…The silencing of NRAT1 resulted in decreased Al uptake, increased Al binding to the cell wall, and hence enhanced Al sensitivity. With subsequent detoxification via transport and Al accumulation into cell vacuoles, possibly mediated by Os ALS1 (Aluminum sensitive 1) [15, 16]. NRAT1 transporter plays a major role in rice Al tolerance mechanisms [17]…”

Section: Introductionmentioning

confidence: 99%

Morpho-physiological analysis of tolerance to aluminum toxicity in rice varieties of North East India

et al. 2017

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Aluminum (Al) is the third most abundant metal in earth crust, whose chemical form is mainly dependent on soil pH. The most toxic form of Al with respect to plants is Al3+, which exists in soil pH <5. Acidic soil significantly limits crop production mainly due to Al3+ toxicity worldwide, impacting approximately 50% of the world’s arable land (in North-Eastern India 80% soil are acidic). Al3+ toxicity in plants ensues root growth inhibition leading to less nutrient and water uptake impacting crop productivity as a whole. Rice is one of the chief grains which constitutes the staple food of two-third of the world population including India and is not untouched by Al3+ toxicity. Al contamination is a critical constraint to plant production in agricultural soils of North East India. 24 indigenous Indica rice varieties (including Badshahbhog as tolerant check and Mashuri as sensitive check) were screened for Al stress tolerance in hydroponic plant growth system. Results show marked difference in growth parameters (relative growth rate, Root tolerance index, fresh and dry weight of root) of rice seedlings due to Al (100 μM) toxicity. Al3+ uptake and lipid peroxidation level also increased concomitantly under Al treatment. Histochemical assay were also performed to elucidate uptake of aluminum, loss of membrane integrity and lipid peroxidation, which were found to be more in sensitive genotypes at higher Al concentration. This study revealed that aluminum toxicity is a serious harmful problem for rice crop productivity in acid soil. Based on various parameters studied it’s concluded that Disang is a comparatively tolerant variety whereas Joymati a sensitive variety. Western blot hybridization further strengthened the claim, as it demonstrated more accumulation of Glutathione reductase (GR) protein in Disang rice variety than Joymati under stressed condition. This study also observed that the emergence of lethal toxic symptoms occurs only after 48h irrespective of the dose used in the study.

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“…Plant species differ in the level of Al resistance because they evolved different mechanisms to overcome the selective pressure of Al toxicity imposed under acid soils [3]. These mechanisms can be broadly divided into two categories: Al resistance and Al tolerance.…”

Section: Introductionmentioning

confidence: 99%

Molecular characterization of TaSTOP1 homoeologues and their response to aluminium and proton (H+) toxicity in bread wheat (Triticum aestivum L.)

et al. 2013

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BackgroundAluminium (Al) toxicity is considered to be one of the major constraints affecting crop productivity on acid soils. Being a trait governed by multiple genes, the identification and characterization of novel transcription factors (TFs) regulating the expression of entire response networks is a very promising approach. Therefore, the aim of the present study was to clone, localize, and characterize the TaSTOP1 gene, which belongs to the zinc finger family (Cys2His2 type) transcription factor, at molecular level in bread wheat.ResultsTaSTOP1 loci were cloned and localized on the long arm of homoeologous group 3 chromosomes [3AL (TaSTOP1-A), 3BL (TaSTOP1-B) and 3DL (TaSTOP1-D)] in bread wheat. TaSTOP1 showed four potential zinc finger domains and the homoeologue TaSTOP1-A exhibited transactivation activity in yeast. Expression profiling of TaSTOP1 transcripts identified the predominance of homoeologue TaSTOP1-A followed by TaSTOP1-D over TaSTOP1-B in root and only predominance of TaSTOP1-A in shoot tissues of two diverse bread wheat genotypes. Al and proton (H+) stress appeared to slightly modulate the transcript of TaSTOP1 homoeologues expression in both genotypes of bread wheat.ConclusionsPhysical localization of TaSTOP1 results indicated the presence of a single copy of TaSTOP1 on homoeologous group 3 chromosomes in bread wheat. The three homoeologues of TaSTOP1 have similar genomic structures, but showed biased transcript expression and different response to Al and proton (H+) toxicity. These results indicate that TaSTOP1 homoeologues may differentially contribute under Al or proton (H+) toxicity in bread wheat. Moreover, it seems that TaSTOP1-A transactivation potential is constitutive and may not depend on the presence/absence of Al at least in yeast. Finally, the localization of TaSTOP1 on long arm of homoeologous group 3 chromosomes and the previously reported major loci associated with Al resistance at chromosome 3BL, through QTL and genome wide association mapping studies suggests that TaSTOP1 could be a potential candidate gene for genomic assisted breeding for Al tolerance in bread wheat.

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Review Genetic and molecular mechanisms of aluminum tolerance in plants

Cited by 40 publications

References 59 publications

The lime–silicate question

The lime–silicate question

Morpho-physiological analysis of tolerance to aluminum toxicity in rice varieties of North East India

Molecular characterization of TaSTOP1 homoeologues and their response to aluminium and proton (H+) toxicity in bread wheat (Triticum aestivum L.)

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