The usefulness of iron bioavailability as a target trait for breeding maize (Zea mays L.) with enhanced nutritional value

Pixley, K.V.; Palacios-Rojas, Natalia; Glahn, Raymond P.

doi:10.1016/j.fcr.2011.05.011

Cited by 46 publications

(35 citation statements)

References 29 publications

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“…The three micronutrients most often lacking from human diets and necessary for maize growth are Fe, zinc (Zn), and copper (Cu) [8]. Research on maize biofortification has included conventional breeding and genetic modification [9] or agronomy practices [10], but all of these strategies have focused on maize cultivated as a monoculture. Fe and Zn remain the most studied micronutrients in terms of biofortification, while only limited research has been conducted on Cu.…”

mentioning

confidence: 99%

Maize grain concentrations and above-ground shoot acquisition of micronutrients as affected by intercropping with turnip, faba bean, chickpea, and soybean

Xia

Zhao

Sun

et al. 2013

Sci. China Life Sci.

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Most research on micronutrients in maize has focused on maize grown as a monocrop. The aim of this study was to determine the effects of intercropping on the concentrations of micronutrients in maize grain and their acquisition via the shoot. We conducted field experiments to investigate the effects of intercropping with turnip (Brassica campestris L.), faba bean (Vicia faba L.), chickpea (Cicer arietinum L.), and soybean (Glycine max L.) on the iron (Fe), manganese (Mn), copper (Cu) and zinc (Zn) concentrations in the grain and their acquisition via the above-ground shoots of maize (Zea mays L.). Compared with monocropped maize grain, the grain of maize intercropped with legumes showed lower concentrations of Fe, Mn, Cu, and Zn and lower values of their corresponding harvest indexes. The micronutrient concentrations and harvest indexes in grain of maize intercropped with turnip were the same as those in monocropped maize grain. Intercropping stimulated the above-ground maize shoot acquisition of Fe, Mn, Cu and Zn, when averaged over different phosphorus (P) application rates. To our knowledge, this is the first report on the effects of intercropping on micronutrient concentrations in maize grain and on micronutrients acquisition via maize shoots (straw+grain). The maize grain Fe and Cu concentrations, but not Mn and Zn concentrations, were negatively correlated with maize grain yields. The concentrations of Fe, Mn, Cu, and Zn in maize grain were positively correlated with their corresponding harvest indexes. The decreased Fe, Mn, Cu, and Zn concentrations in grain of maize intercropped with legumes were attributed to reduced translocation of Fe, Mn, Cu, and Zn from vegetative tissues to grains. This may also be related to the delayed senescence of maize plants intercropped with legumes. We conclude that turnip/maize intercropping is beneficial to obtain high maize grain yield without decreased concentrations of Fe, Mn, Cu, and Zn in the grain. Further research is required to clarify the mechanisms underlying the changes in micronutrient concentrations in grain of intercropped maize. intercropping, maize, micronutrient, harvest index, dilution Citation:Xia H Y, Zhao J H, Sun J H, et al. Maize grain concentrations and above-ground shoot acquisition of micronutrients as affected by intercropping with turnip, faba bean, chickpea, and soybean. Sci China Life Sci, 2013, 56: 823-834,

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confidence: 99%

Maize grain concentrations and above-ground shoot acquisition of micronutrients as affected by intercropping with turnip, faba bean, chickpea, and soybean

Xia

Zhao

Sun

et al. 2013

Sci. China Life Sci.

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“…growing environments had no effect on bioavailable Fe in maize (Oikeh et al 2004a); however, Pixley et al (2011a) detected larger E than GEI for Fe bioavailability in maize. It is therefore suggested that responses of cultivars to different production environments need to be well understood to improve the probability of predicting and identifying cultivars that are not only high in seed-Fe and/or -Zn concentrations but also these micronutrients are more bioavailable to absorption (Briat and Lobreaux 1997;Pixley et al 2011a).…”

Section: B Genotype â Environment Interaction and Relationships Betwmentioning

confidence: 99%

“…Postharvest storage over 4 weeks at 7 C resulted in losses of antioxidant potential and b-carotene concentration independent of cultivar. Furthermore, genotypic differences in maturity among maize hybrids were associated with b-carotene concentration in grain, thus, more research is warranted to study the effects of maturity, environment, and timing of harvest on proA concentrations in grains (Pixley et al 2011a).…”

Section: B Factors Influencing Nutrients Bioavailabilitymentioning

confidence: 99%

“…It is therefore suggested that responses of cultivars to different production environments need to be well understood to improve the probability of predicting and identifying cultivars that are not only high in seed-Fe and/or -Zn concentrations but also these micronutrients are more bioavailable to absorption (Briat and Lobreaux 1997;Pixley et al 2011a). …”

Section: B Genotype â Environment Interaction and Relationships Betwmentioning

confidence: 99%

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Nutritionally Enhanced Staple Food Crops

Dwivedi

Sahrawat

Kedar

et al. 2012

Plant Breeding Reviews

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“…Six dilutions of each carotenoid standard (SIGMA chemicals, USA) were used to make the standard curve; and concentration of various carotenoids in each sample was estimated by standard regression with external standards. The concentration of provitamin A carotenoids was calculated by adding the amount of β-carotene and onehalf of the amount of β-cryptoxanthin, while concentration of non-provitamin A carotenoids was computed by adding the value of lutein and zeaxanthin (Pixley et al 2011). Total carotenoids were computed by summing the value of lutein, zeaxanthin, β-cryptoxanthin and β-carotene.…”

Section: Carotenoid Extraction and Quantificationmentioning

confidence: 99%

Genetic variability and inter-relationship of kernel carotenoids among indigenous and exotic maize (Zea maysL.) inbreds

Muthusamy

Hossain

Thirunavukkarasu

et al. 2015

Cereal Research Communications

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Carotenoids play vital role in growth and development of human beings. Yellow maize kernel contains carotenoids that possess provitamin A and antioxidant activity. Multilocation based analyses of 105 maize inbreds of indigenous and exotic origin revealed wide genetic variation for lutein (0.2-11.3 µg/g), zeaxanthin (0.2-20.0 µg/g) and β-carotene (0.0-15.0 µg/g). For β-cryptoxanthin, low variation (0.1-3.3 µg/g) was observed. Carotenoids were quite stable over environments that played minor role in causing variation. The heritability (>90%) and genetic advance (>75%) were high for all the carotenoid components. Zeaxanthin showed positive correlation with lutein and β-cryptoxanthin, while β-carotene, the major provitamin A carotenoid, did not show correlation with other carotenoids. Kernel colour was positively correlated with lutein (0.25), zeaxanthin (0.47) and β-cryptoxanthin (0.44), but not with β-carotene (0.04). This suggested that visual selection based on kernel colour will be misleading in selecting provitamin A-rich genotypes. Inbreds with provitamin A and non-provitamin A carotenoids identified in the present study will help in development of biofortified maize hybrids.

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The usefulness of iron bioavailability as a target trait for breeding maize (Zea mays L.) with enhanced nutritional value

Cited by 46 publications

References 29 publications

Maize grain concentrations and above-ground shoot acquisition of micronutrients as affected by intercropping with turnip, faba bean, chickpea, and soybean

Maize grain concentrations and above-ground shoot acquisition of micronutrients as affected by intercropping with turnip, faba bean, chickpea, and soybean

Nutritionally Enhanced Staple Food Crops

Genetic variability and inter-relationship of kernel carotenoids among indigenous and exotic maize (Zea maysL.) inbreds

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