Breeding for Al Tolerance by Unravelling Genetic Diversity in Bread Wheat

Garcia‐Oliveira, Ana Luísa; Poschenrieder, Charlotte; Barceló, Juan Antonio; Martins-Lopes, Paula

doi:10.1007/978-3-319-19968-9_7

Cited by 10 publications

(29 citation statements)

References 99 publications

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“…Al-activated malate efflux is a common characteristic in most of Al-resistant genotypes of wheat [34]. In accordance with previous studies, Al treatment also triggered malate exudation from the roots of Viloso Mole followed by continuous decline (Figure 4b).…”

Section: Discussionsupporting

confidence: 91%

“…The results of the present study suggest that the Al tolerance of Barbela 7/72/92 is clearly outstanding compared to Viloso Mole, probably due to the difference in both level as well as kind of OAs secreted by its roots (Figures 3 and 4). In the past, most studies advocated that Al-activated malate efflux from root apices is responsible for Al tolerance in wheat, even though some Al tolerant Brazilian bread wheat genotypes, particularly cultivar Carazinho, presented a constitutive citrate efflux from their root apex and was identified as an alternate and rare mechanism to cope with Al phytotoxicity [32][33][34]. More recently, our group has also established that, at the molecular level, the mechanism of citrate efflux also operates in Al tolerant Portuguese bread wheat genotypes [35].…”

Section: Discussionmentioning

confidence: 99%

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Differential Physiological Responses of Portuguese Bread Wheat (Triticum aestivum L.) Genotypes under Aluminium Stress

et al. 2016

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The major limitation of cereal production in acidic soils is aluminium (Al) phytotoxicity which inhibits root growth. Recent evidence indicates that different genotypes within the same species have evolved different mechanisms to cope with this stress. With these facts in mind, root responses of two highly Al tolerant Portuguese bread wheat genotypes-Barbela 7/72/92 and Viloso mole-were investigated along with check genotype Anahuac (Al sensitive), using different physiological and histochemical assays. All the assays confirmed that Barbela 7/72/92 is much more tolerant to Al phytotoxicity than Viloso Mole. Our results demonstrate that the greater tolerance to Al phytotoxicity in Barbela 7/72/92 than in Viloso Mole relies on numerous factors, including higher levels of organic acid (OAs) efflux, particularly citrate efflux. This might be associated with the lower accumulation of Al in the root tips, restricting the Al-induced lipid peroxidation and the consequent plasma membrane integrity loss, thus allowing better root regrowth under Al stress conditions. Furthermore, the presence of root hairs in Barbela 7/72/92 might also help to circumvent Al toxicity by facilitating a more efficient uptake of water and nutrients, particularly under Al stress on acid soils. In conclusion, our findings confirmed that Portuguese bread wheat genotype Barbela 7/72/92 represents an alternative source of Al tolerance in bread wheat and could potentially be used to improve the wheat productivity in acidic soils.

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Section: Discussionsupporting

confidence: 91%

Section: Discussionmentioning

confidence: 99%

Differential Physiological Responses of Portuguese Bread Wheat (Triticum aestivum L.) Genotypes under Aluminium Stress

et al. 2016

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“…; Garcia‐Oliveira et al . ). In the post‐genomic era, a major emphasis is to explore candidate genes that may be involved in Al tolerance mechanisms and, subsequently, their utilisation for development of Al‐tolerant cultivars.…”

Section: Discussionmentioning

confidence: 97%

“…During the last decades, major loci associated with genetic variability for Al tolerance have been identified in major crop species including wheat through rapid progress in understanding of the physiological and molecular basis for Al tolerance mechanisms in plants (Ryan et al 2011;Garcia-Oliveira et al 2015). In the post-genomic era, a major emphasis is to explore candidate genes that may be involved in Al tolerance mechanisms and, subsequently, their utilisation for development of Al-tolerant cultivars.…”

Section: Discussionmentioning

confidence: 99%

Molecular cloning of TaMATE2 homoeologues potentially related to aluminium tolerance in bread wheat (Triticum aestivum L.)

et al. 2018

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Recently, members of the MATE family have been implicated in aluminium (Al) tolerance by facilitating citrate efflux in plants. The aim of the present work was to perform a molecular characterisation of the MATE2 gene in bread wheat. Here, we cloned a member of the MATE gene family in bread wheat and named it TaMATE2, which showed the typical secondary structure of MATE-type transporters maintaining all the 12 transmembrane domains. Amplification in Chinese Spring nulli-tetrasomic and ditelosomic lines revealed that TaMATE2 is located on the long arm of homoeologous group 1 chromosomes. The transcript expression of TaMATE2 homoeologues in two diverse bread wheat genotypes, Barbela 7/72/92 (Al-tolerant) and Anahuac (Al-sensitive), suggested that TaMATE2 is expressed in both root and shoot tissues of bread wheat, but mainly confined to root rather than shoot tissues. A time-course analysis of TaMATE2 homoeologue transcript expression revealed the Al responsive expression of TaMATE2 in root apices of the Al-tolerant genotype, Barbela 7/72/92. Considering the high similarity of TaMATE2 together with similar Al responsive expression pattern as of ScFRDL2 from rye and OsFRDL2 from rice, it is likely that TaMATE2 also encodes a citrate transporter. Furthermore, the TaMATE2-D homoeologue appears to be near the previously reported locus (wPt0077) on chromosome 1D for Al tolerance. In conclusion, molecular cloning of TaMATE2 homoeologues, particularly TaMATE2-D, provides a plausible candidate for Al tolerance in bread wheat that can be used for the development of more Al-tolerant cultivars in this staple crop.

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“…. Among these forms, Al 3+ is the most phytotoxic for wheat rhizosphere, while Al (OH) 2 + also appears to be toxic to dicotyledonous species (GARCIA-OLIVEIRA et al, 2015). The toxicity can be explained by differences in sphingolipids, especially glycosylphosphatidyl inositol, present in the plasma membranes of both types of plants.…”

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confidence: 99%

[ARTICLE PARTIAL RETRACTION] Organic acid carriers in tolerance to toxic aluminum in wheat

Silva

Zanella²,

Delatorre

et al. 2018

Cienc. Rural

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Aluminum (Al) toxicity in plants is seen in about 15% of the soils worldwide, restraining yields in arable land. In Brazil, acidic soils limit production of wheat (Triticum aestivum L.) and other cereals. Al is toxic for most winter cereals when its concentration increases and soil pH is below 5. One of the main concerns with acidic soil is the increase in the mobility of Al3+ions. Al binds to cell walls in roots, preventing meristematic elongation in sensitive species, causing damage to the root system and results in lower yields. Al3+ forms highly stable complexes with phosphorus (P), limiting its availability to plants, as well as reducing cell division and elongation. To deal with Al toxicity, plants have developed strategies such as organic acid (OA) exudation by roots; this mechanism of detoxification has been well-characterized. OAs, in turn, chelate ions Al3, forming non-toxic compounds that do not penetrate the root system. Some genes responsible for Al tolerance in wheat have been identified, particularly TaALMT1 and TaMATE1B that transport malate and citrate OAs, respectively. In this review, we discussed the mechanisms by which Al damages roots those by which plants are protected, primarily through two genes. We also described the interaction of the ALMT1 gene with P and iron (Fe).

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Breeding for Al Tolerance by Unravelling Genetic Diversity in Bread Wheat

Cited by 10 publications

References 99 publications

Differential Physiological Responses of Portuguese Bread Wheat (Triticum aestivum L.) Genotypes under Aluminium Stress

Differential Physiological Responses of Portuguese Bread Wheat (Triticum aestivum L.) Genotypes under Aluminium Stress

Molecular cloning of TaMATE2 homoeologues potentially related to aluminium tolerance in bread wheat (Triticum aestivum L.)

[ARTICLE PARTIAL RETRACTION] Organic acid carriers in tolerance to toxic aluminum in wheat

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