ORCID Profile
0000-0001-5616-6622
Current Organisation
Integrity Ag and Environment
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Publisher: Oxford University Press (OUP)
Date: 23-10-2019
DOI: 10.1093/AOB/MCY189
Publisher: Wiley
Date: 14-03-2022
DOI: 10.1002/CCHE.10539
Abstract: This field and glasshouse study evaluates the relative effectiveness of agronomic zinc biofortification strategies to increase the Zn concentration in sweetcorn ( Zea mays ) kernels for human health, using applications of Zn fertilizer to the root‐zone or to foliage. Plants accumulated additional Zn as the rate of Zn applied to the root‐zone increased, but most was retained in the stems and foliage and little was translocated into the kernels (≤7%). A large proportion of the additional Zn stored in the foliage was in the form of Zn‐phytate. In contrast, in field‐grown plants where soil Zn was adequate for maximizing commercial yields, Zn applications to foliage increased kernel Zn concentrations by up to 100%. ZnSO 4 ·7H 2 O was more effective to use in foliar applications compared with Zn‐EDTA. The elevated kernel concentrations recorded for two varieties (59.1 and 71.1 mg Zn kg −1 ) were greater than all previously reported biofortification responses from maize. These concentrations also matched or exceeded the HarvestPlus target of 60 mg Zn kg −1 for maize. With a total kernel Zn content of 3.6 mg Zn per cob, approximately 25%–45% of the recommended dietary Zn intake could be met with one cob of Zn‐biofortified sweetcorn.
Publisher: Springer Science and Business Media LLC
Date: 12-04-2019
DOI: 10.1007/S00425-019-03162-X
Abstract: In sweetcorn (Zea mays L.), embryo Zn is accumulated mainly as Zn-phytate, whereas endosperm Zn is complexed with a N- or S-containing ligand. Understanding the speciation of Zn in crop plants helps improve the effectiveness of biofortification efforts. Kernels of four sweetcorn (Zea mays L.) varieties were analysed for Zn concentration and content. We also assessed the speciation of the Zn in the embryo, endosperm, and pericarp in situ using synchrotron-based X-ray absorption spectroscopy. The majority of the Zn was in the endosperm and pericarp (72%), with the embryo contributing 28%. Approximately 79% of the Zn in the embryo accumulated as Zn-phytate, whereas in the endosperm most of the Zn was complexed with a N- or S-containing ligand, possibly as Zn-histidine and Zn-cysteine. This suggests that whilst the Zn in the endosperm and pericarp is likely to be bioavailable for humans, the Zn in the embryo is of low bioavailability. This study highlights the importance of targeting the endosperm of sweetcorn kernels as the tissue for increasing bioavailable Zn concentration.
Publisher: Oxford University Press (OUP)
Date: 22-05-2020
DOI: 10.1093/JXB/ERAA244
Abstract: Grain yield and mineral nutrient concentration in cereal crops are usually inversely correlated, undermining biofortification efforts. Here, sink size, expressed as kernel number per cob, was manipulated by controlling the time when the silks of sweetcorn (Zea mays) cv. Hybrix 5 and var. HiZeax 103146 were exposed to pollen. Twelve other varieties were manually pollinated to achieve the maximum potential kernel number per cob, and kernel Zn concentration was correlated with kernel number and kernel mass. As kernel number increased, kernel Zn concentration decreased, with the decrease occurring to similar extents in the embryo tissue and the rest of the kernel. However, total kernel Zn accumulated per cob increased with increasing kernel number, as the small decreases in in idual kernel Zn concentration were more than offset by increases in kernel number. When both kernel number and mass were considered, 90% of the variation in kernel Zn concentration was accounted for. Differential distribution of assimilates and Zn to sweetcorn cobs led to significant decreases in kernel Zn concentration with increasing kernel number. This suggests there will be challenges to achieving high kernel Zn concentrations in modern high-yielding sweetcorn varieties unless genotypes with higher Zn translocation rates into kernels can be identified.
Publisher: University of Queensland Library
Date: 2020
Publisher: Elsevier BV
Date: 10-2020
Publisher: Elsevier BV
Date: 11-2023
No related grants have been discovered for Zhong Xiang Cheah.