Genome-wide association mapping of zinc and iron concentration in barley landraces from Ethiopia and Eritrea

Mamo, Bullo Erena; Barber, Brian L.; Steffenson, Brian J.

doi:10.1016/j.jcs.2014.08.007

Cited by 51 publications

(51 citation statements)

References 21 publications

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“…() found mean values of around 39 and 48 mg kg −1 in two different sets of accessions. Zn concentrations were similar to the ones reported recently for barley landraces from Ethiopia and Eritrea (between 30.7 and 48.5 mg kg −1 in different sample sets; Mamo et al ., ). Thus, it appears that barley grains are on average slightly more Zn‐dense than wheat grains, based on data compiled by White & Broadley () and Xu et al .…”

Section: Discussionmentioning

confidence: 97%

Spatially resolved analysis of variation in barley (Hordeum vulgare) grain micronutrient accumulation

et al. 2016

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Summary Genetic biofortification requires knowledge on natural variation and the underlying mechanisms of micronutrient accumulation. We therefore studied diversity in grain micronutrient concentrations and spatial distribution in barley (Hordeum vulgare), a genetically tractable model cereal and an important crop with widespread cultivation. We assembled a diverse collection of barley cultivars and landraces and analysed grain micronutrient profiles in genebank material and after three independent cultivations. Lines with contrasting grain zinc (Zn) accumulation were selected for in‐depth analysis of micronutrient distribution within the grain by micro‐proton‐induced X‐ray emission (μ‐PIXE). Also, we addressed association with grain cadmium (Cd) accumulation. The analysis of > 120 lines revealed substantial variation, especially in grain Zn concentrations. A large fraction of this variation is due to genetic differences. Grain dissection and μ‐PIXE analysis of contrasting lines showed that differences in grain Zn accumulation apply to all parts of the grain including the endosperm. Cd concentrations exceeded the Codex Alimentarius threshold in most of the representative barley lines after cultivation in a Cd‐contaminated agricultural soil. Two important conclusions for biofortification are: first, high‐Zn grains contain more Zn also in the consumed parts of the grain; and second, higher micronutrient concentrations are strongly associated with higher Cd accumulation.

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Section: Discussionmentioning

confidence: 97%

Spatially resolved analysis of variation in barley (Hordeum vulgare) grain micronutrient accumulation

et al. 2016

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“…In spite of the high heritability obtained in greenhouse conditions (Mamo et al 2014), this group of traits exhibited low heritability (Joshi et al 2010) in fields since the prevailing effects of environments (Marwede et al 2004). The genotype × environment interactions (GEI) are the major sources for phenotypic variation in micro-nutrients and have been investigated in wheat (Ficco et al 2009).…”

Section: Introductionmentioning

confidence: 90%

Characterizing barley seed macro- and micro-nutrients under multiple environmental conditions

Xue¹,

Gianinetti²,

Wang³

et al. 2016

Cereal Research Communications

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Crop seeds are the main staples in human diet, especially in undeveloped countries. In any case, the diet needs to be rich not only in macro-nutrients like carbohydrates and protein, but also in micro-nutrients. Nevertheless, both the macro-and micro-nutrients presented in seeds largely vary in consequence of field and environment conditions. In this research, 60 lines of a barley RILs population segregating for the SSR marker Hvm74, which is genetically linked to the GPC (grain protein content) locus (HvNAM-1), were studied in 4 environments (two growing years and two field managements) by carrying out a comprehensive profile of seed macro-(starch, total nitrogen and total soluble protein) and micro-nutrients (phytate, phenolics, flavonoids, P i , Zn and Fe). Under field conditions, all the components were largely affected by the environment, but TN (total nitrogen) exhibited high genotype contribution, while micro-nutrients displayed higher genotype × environments interactions (GEI) than macro-nutrients. In order to approach the effects of carbon-nitrogen (C-N) balance on other seed components, two C/N ratios were calculated: C/TN (CNR1) and C/TSP (CNR2). CNR2 exhibited stronger negative correlations with all micro-nutrients. Hence, the significant GEI and its negative relationships with CNR2 highlighted the different characters of micro-nutrients in barley seeds.

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“…Quantitative trait loci (QTLs) controlling Zn accumulation have been mapped in several species, e.g. in wheat (Genc et al 2009), the common bean (Blair et al 2011), and barley (Lonergan et al 2009;Mamo et al 2014). However, there is practically no definitive information on genes underlying the variation.…”

Section: Mechanistic Understanding Of Zn Accumulation Derived From Stmentioning

confidence: 99%

How metal hyperaccumulating plants can advance Zn biofortification

Clemens

2016

Plant Soil

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Background Zn hyperaccumulating plants reach Zn concentrations in their leaves that are several hundredfold higher than the target values set for Zn-biofortified crops. Scope This extreme trait is relevant for Zn biofortification in various ways that are being discussed based on what is known about Zn hyperaccumulating plants.Conclusions First, Zn hyperaccumulation is the result of changes in metal homeostasis networks shared by all higher plants. It is not strictly dependent on high Zn levels in the soil. Thus, mechanistic insights gained from the study of Zn hyperaccumulators can support the breeding and engineering of Zn-biofortified crops. Second, certain plant families, the Brassicaceae in particular, appear to be genetically predispositioned to evolve enhanced Zn accumulation, suggesting the existence of intermediate species with elevated Zn concentrations in their leaves below the hyperaccumulation threshold or the potential to breed for such plants. This calls for extended screening especially among potential vegetable crops, ideally guided by knowledge about the at least partially convergent evolution of Zn hyperaccumulation. Third, the introduction of leafy vegetables with high Zn concentrations or even of Zn hyperaccumulator leaves into diets may represent a valid complementary biofortification approach.

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Genome-wide association mapping of zinc and iron concentration in barley landraces from Ethiopia and Eritrea

Cited by 51 publications

References 21 publications

Spatially resolved analysis of variation in barley (Hordeum vulgare) grain micronutrient accumulation

Spatially resolved analysis of variation in barley (Hordeum vulgare) grain micronutrient accumulation

Characterizing barley seed macro- and micro-nutrients under multiple environmental conditions

How metal hyperaccumulating plants can advance Zn biofortification

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