1.Department of Health (1991) Report on Health and Social Subjects: 41. Dietary Reference Values for Food Energy and Nutrients for the United Kingdom. London: Her Majesty's Stationery Office (HMSO).
2.Emsley, J (1998) The Elements. 3rd ed., Oxford: Clarendon Press.
4.White, PJ & Broadley, MR (2009) Biofortification of crops with seven mineral elements often lacking in human diets – iron, zinc, copper, calcium, magnesium, selenium and iodine. New Phytologist 182, 49–84.
5.Institute of Medicine (U.S.) (1997) Dietary Reference Intakes for Calcium, Phosphorus, Magnesium, Vitamin D, and Fluoride. Washington, DC: Standing Committee on the Scientific Evaluation of Dietary Reference Intakes, Food and Nutrition Board, The National Academies Press.
6.Institute of Medicine (U.S.) (2005) Dietary Reference Intakes for Water, Potassium, Sodium, Chloride, and Sulfate. Washington, DC: Standing Committee on the Scientific Evaluation of Dietary Reference Intakes, Food and Nutrition Board, Panel on Dietary Reference Intakes for Electrolytes and Water, The National Academies Press.
7.Henderson, L, Irving, K, Gregory, J et al. (2003) The National Diet and Nutrition Survey: Adults Aged 19–64 Years. Volume 3: Vitamin and Mineral Intake and Urinary Analysis. London: Her Majesty's Stationery Office (HMSO).
8.Hoare, J, Henderson, L, Bates, CJ et al. (2004) The National Diet & Nutrition Survey: Adults Aged 19 to 64 Years. Summary Report. London: Her Majesty's Stationery Office (HMSO).
9.Dwyer, J, Picciano, MF, Raiten, DJ et al. (2003) Collection of food and dietary supplement intake data: what we eat in America-NHANES. J Nutr 133, 609S–623S.
10.Food Standards Agency (2002) McCance and Widdowson's The Composition of Foods. Sixth Summary Edition. Cambridge: Royal Society of Chemistry.
11.USDA-ARS (U.S. Department of Agriculture, Agricultural Research Service) (2009) USDA National Nutrient Database for Standard Reference, Release 22. Nutrient Data Laboratory Home Page. Available at http://www.ars.usda.gov/ba/bhnrc/ndl (accessed 13 December 2009).
12.Rennie, KL, Coward, A & Jebb, SA (2007) Estimating under-reporting of energy intake in dietary surveys using an individualised method. Br J Nutr 97, 1169–1176.
13.Westerterp, KR & Speakman, JR (2008) Physical activity energy expenditure has not declined since the 1980s and matches energy expenditures of wild mammals. Int J Obes 32, 1256–1263.
14.Vuckovic, N, Ritenbaugh, C, Taren, DL et al. (2000) A qualitative study of participants' experiences with dietary assessment. J Am Diet Assoc 100, 1023–1028.
15.Ovaskainen, M-L, Paturi, M, Reinivuo, H et al. (2008) Accuracy in the estimation of food servings against the portions in food photographs. Eur J Clin Nutr 62, 674–681.
17.White, PJ & Broadley, MR (2005) Biofortifying crops with essential mineral elements. Trends Plant Sci 10, 586–593.
18.Watanabe, T, Broadley, MR, Jansen, S et al. (2007) Evolutionary control of leaf element composition in plants. New Phytologist 174, 516–523.
19.White, PJ & Broadley, MR (2003) Calcium in plants. Ann Bot 92, 487–511.
20.Karley, AJ & White, PJ (2009) Moving cationic minerals to edible tissues: potassium, magnesium, calcium. Curr Opin Plant Biol 12, 291–298.
21.White, PJ (2001) The pathways of calcium movement to the xylem. J Exp Bot 52, 891–899.
22.Ho, L & White, PJ (2005) A cellular hypothesis for the induction of blossom-end rot in tomato fruit. Ann Bot 95, 571–581.
23.White, PJ, Bradshaw, JE, Finlay, M et al. (2009) Relationships between yield and mineral concentrations in potato tubers. HortScience 44, 6–11.
24.Thompson, K, Parkinson, JA, Band, SR et al. (1997) A comparative study of leaf nutrient concentrations in a regional herbaceous flora. New Phytologist 136, 679–689.
25.Broadley, MR, Bowen, HC, Cotterill, HL et al. (2003) Variation in the shoot calcium content of angiosperms. J Exp Bot 54, 1431–1446.
26.Broadley, MR, Bowen, HC, Cotterill, HL et al. (2004) Phylogenetic variation in the shoot mineral concentration of angiosperms. J Exp Bot 55, 321–336.
27.Broadley, MR, Hammond, JP, King, GJ et al. (2008) Shoot calcium (Ca) and magnesium (Mg) concentrations differ between subtaxa, are highly heritable, and associate with potentially pleiotropic loci in Brassica oleracea. Plant Physiol 146, 1707–1720.
28.Farnham, MW, Grusak, MA & Wang, M (2000) Calcium and magnesium concentration of inbred and hybrid broccoli heads. J Am Soc Horticultural Sci 125, 344–349.
29.Rosa, EAS, Haneklaus, SH & Schug, E (2002) Mineral content of primary and secondary inflorescences of eleven broccoli cultivars grown in early and late seasons. J Plant Nutr 25, 1741–1751.
30.Kopsell, DE, Kopsell, DA, Lefsrud, MG et al. (2004) Variability in elemental accumulations among leafy Brassica oleracea cultivars and selections. J Plant Nutr 27, 1813–1826.
31.Wu, J, Yuan, Y-X, Zhang, X-W et al. (2008) Mapping QTL for mineral accumulation and shoot dry biomass under different Zn nutritional conditions in Chinese cabbage (Brassica rapa L. ssp. pekinensis). Plant Soil 310, 25–40.
32.Grusak, MA & Cakmak, I (2005) Methods to improve the crop-delivery of minerals to humans and livestock. In Plant Nutritional Genomics, pp. 265–286 [Broadley, MR and White, PJ]. Oxford: Blackwell.
33.Rodríguez Galdón, B, Oropeza González, R, Rodríguez Rodríguez, E et al. (2008) Comparison of mineral and trace element contents in onion cultivars (Allium cepa L.). J Sci Food Agric 88, 1554–1561.
34.Ibrikci, H, Knewtson, SJB & Grusak, MA (2003) Chickpea leaves as a vegetable green for humans: evaluation of mineral composition. J Sci Food Agric 83, 945–950.
35.White, PJ, Hammond, JP, King, GJ et al. (2010) Genetic analysis of potassium use efficiency in Brassica oleracea L. Ann Bot (Epublication ahead of print version; doi: 10.1093/aob/mcp253).
36.Chávez, AL, Sánchez, T, Jaramillo, G et al. (2005) Variation of quality traits in cassava roots evaluated in landraces and improved clones. Euphytica 143, 125–133.
37.Nicolle, C, Simon, G, Rock, E et al. (2004) Genetic variability influences carotenoid, vitamin, phenolic, and mineral content in white, yellow, purple, orange, and dark-orange carrot cultivars. J Am Soc Horticultural Sci 129, 523–529.
38.Davey, MW, Stals, E, Ngoh-Newilah, G et al. (2007) Sampling strategies and variability in fruit pulp micronutrient contents of West and Central African bananas and plantains (Musa species). J Agric Food Chem 55, 2633–2644.
39.Nergiz, C & Yildiz, H (1997) Research on chemical composition of some varieties of European plums (Prunus domestica) adapted to the Aegean district of Turkey. J Agric Food Chem 45, 2820–2823.
40.Hirschi, K (2001) Vacuolar H+/Ca2+ transport: who's directing the traffic? Trends Plant Sci 6, 100–104.
41.Hirschi, KD, Miranda, ML & Wilganowski, NL (2001) Phenotypic changes in Arabidopsis caused by expression of a yeast Ca2+/H+ antiporter. Plant Mol Biol 46, 57–65.
42.Park, S, Kim, C-K, Pike, LM et al. (2004) Increased calcium in carrots by expression of an Arabidopsis H+/Ca2+ transporter. Mol Breeding 14, 275–282.
43.Morris, J, Hawthorne, KM, Hotze, T et al. (2008) Nutritional impact of elevated calcium transport activity in carrots. Proc Natl Acad Sci USA 105, 1431–1435.
44.Park, S, Elless, MP, Park, J et al. (2009) Sensory analysis of calcium-biofortified lettuce. Plant Biotechnol J 7, 106–117.
45.Park, S, Kang, T-S, Kim, C-K et al. (2005b) Genetic manipulation for enhancing calcium content in potato tuber. J Agric Food Chem 53, 5598–5603.
46.Park, S, Cheng, NH, Pittman, JK et al. (2005a) Increased calcium levels and prolonged shelf life in tomatoes expressing Arabidopsis H+/Ca2+ transporters. Plant Physiol 139, 1194–1206.
47.Chung, MY, Han, J-S, Giovannoni, J et al. (2010) Modest calcium increases in tomatoes expressing a variant of Arabidopsis cation/H+ antiporter. Plant Biotechnol Rep 4, 15–21.
48.Wyatt, SE, Tsou, P-L & Robertson, D (2002) Expression of the high capacity calcium-binding domain of calreticulin increases bioavailable calcium stores in plants. Transgenic Res 11, 1–10.
49.Marschner, H (1995) Mineral Nutrition of Higher Plants. 2nd ed., London: Academic Press.
50.Mengel, K & Kirkby, EA (2001) Principles of Plant Nutrition. 5th ed., Dordrecht: Kluwer Academic Press.
51.Römheld, V & Kirkby, EA (2007) Magnesium functions in crop nutrition and yield. Proceedings 616, International Fertiliser Society, York, UK. pp. 1–24.
52.Broadley, MR, White, PJ, Bryson, RJ et al. (2006) Biofortification of U.K. food crops with selenium (Se). Proc Nutr Soc 65, 169–181.
53.Broadley, MR, Alcock, J, Alford, J et al. (2010) Selenium biofortification of high-yielding winter wheat (Triticum aestivum L.) by liquid or granular Se fertilisation. Plant Soil (Epublication ahead of print version; doi: 10.1007/s11104-009-0234-4).
54.Cakmak, I (2008) Enrichment of cereal grains with zinc: agronomic or genetic biofortification? Plant Soil 302, 1–17.
55.Jefferies, RL & Willis, AJ (1964) Studies on the calcicole-calcifuge habit. II. The influence of calcium on the growth and establishment of four species in soil and sand cultures. J Ecol 52, 691–707.
56.Hermans, C, Johnson, GN, Strasser, RJ et al. (2004) Physiological characterization of magnesium deficiency in sugar beet: acclimation to low magnesium differentially affects photosystems I and II. Planta 220, 344–355.
57.Hermans, C & Verbruggen, N (2005) Physiological characterization of Mg deficiency in Arabidopsis thaliana. J Exp Bot 56, 2153–2161.
58.Burns, IG, Walker, RL & Moorby, J (1997) How do nutrients drive growth? Plant Soil 196, 321–325.
59.Metson, AJ (1974) Magnesium in New Zealand soils. I. Some factors governing the availability of soil magnesium: a review. N Z J Exp Agric 2, 277–319.
60.Draycott, AP & Allison, MF (1998) Magnesium fertilisers in soil and plants: comparisons and usage. Proceedings 412, International Fertiliser Society, York, UK. pp. 1–28.