How Much Nutritional Iron Deficiency in Humans Globally Is due to an Underlying Zinc Deficiency?

Graham, Robin D.; Knez, Marija; Welch, Ross M.

doi:10.1016/b978-0-12-394276-0.00001-9

Cited by 85 publications

(62 citation statements)

References 114 publications

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“…The contents of heavy metals in plant products for human nutrition or in fodder plants are important for the quality of the harvest [87][88][89][90][91][92][93][94][95][96][97][98]. It must be distinguished between seed/grain crops such as cereals or soybean and plants of which the whole shoot is harvested such as plants used for silage or grasslands.…”

Section: Selective Accumulation Of Heavy Metals In Harvested Plant Partsmentioning

confidence: 99%

“…In certain regions a sufficient supply of heavy metals for humans (e.g., Fe and Zn) is an issue [87][88][89][90][91]. The uptake of heavy metals into the plants, the transport to the shoot and redistribution processes within the shoot are involved in controlling the contents in harvested products.…”

Section: Selective Accumulation Of Heavy Metals In Harvested Plant Partsmentioning

confidence: 99%

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Heavy Metals in Crop Plants: Transport and Redistribution Processes on the Whole Plant Level

2015

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Abstract:Copper, zinc, manganese, iron, nickel and molybdenum are essential micronutrients for plants. However, when present in excess they may damage the plant or decrease the quality of harvested plant products. Some other heavy metals such as cadmium, lead or mercury are not needed by plants and represent pollutants. The uptake into the roots, the loading into the xylem, the acropetal transport to the shoot with the transpiration stream and the further redistribution in the phloem are crucial for the distribution in aerial plant parts. This review is focused on long-distance transport of heavy metals via xylem and phloem and on interactions between the two transport systems. Phloem transport is the basis for the redistribution within the shoot and for the accumulation in fruits and seeds. Solutes may be transferred from the xylem to the phloem (e.g., in the small bundles in stems of cereals, in minor leaf veins). Nickel is highly phloem-mobile and directed to expanding plant parts. Zinc and to a lesser degree also cadmium are also mobile in the phloem and accumulate in meristems (root tips, shoot apex, axillary buds). Iron and manganese are characterized by poor phloem mobility and are retained in older leaves.

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Section: Selective Accumulation Of Heavy Metals In Harvested Plant Partsmentioning

confidence: 99%

Section: Selective Accumulation Of Heavy Metals In Harvested Plant Partsmentioning

confidence: 99%

Heavy Metals in Crop Plants: Transport and Redistribution Processes on the Whole Plant Level

2015

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“…High pH and precipitation lead to Zn deficiency in soil . Zn deficiency in crops causes malnutrition in children and birth problems in pregnant women (Prasad 2009;Graham et al 2012). However, few plant species are able to withstand Zn deficiency, which is known as Zn-efficiency (ZE) by modulating biochemical and molecular mechanisms.…”

Section: Introductionmentioning

confidence: 99%

Auxin signaling is closely associated with Zn-efficiency in rice (Oryza sativa L.)

Begum

Islam

Sarkar

et al. 2016

Journal of Plant Interactions

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This study elucidates the involvement of auxin with Zn-efficiency (ZE) in Zn-efficient rice var. Pokkali. Pokkali showed no significant decrease in morpho-physiological features, electrolyte leakage and total soluble proteins due to Zn deficiency as compared with Zn-sufficient seedlings. However, auxin inhibitor under Zn deficiency severely affected these characteristics, suggesting that ZE is associated with auxin signaling in rice. Results further revealed significant decreases in the expression of Zn transporter genes (OsIRT1, OsZIP4 and OsZIP1), OsDMAS1 (deoxymugeneic acid synthase) and phytochelatin in roots due to auxin inhibitor. It implies that auxin signaling may trigger Zn uptake, transport and chelation in rice seedlings to withstand Zn-deficiency. Further, significant reduction of major S-metabolites (cysteine, methionine, glutathione) and antioxidant enzymes (superoxide dismutase and glutathione reductase) along with increased H 2 O 2 content, due to auxin inhibitor under Zn deficiency compared with controls. Taken together, these findings reveal that mechanisms associated with ZE in Pokkali are dependent on auxin signaling. ARTICLE HISTORY

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“…The recommended dietary allowances for Zn are 5 mg/day for infants, 10 mg/day for children less than 10 years, 15 mg/day for males more than 10 years, 12 mg/day for females more than 10 years and 15 mg/day for women during pregnancy (Welch, 2001). Zinc deficiency is responsible for the development of a large number of illness and diseases including stunting of growth, compromised immune system function (Prasad, 2009;Barnett et al, 2010), cancer , susceptibility to infectious diseases and poor birth outcomes in pregnant women (Prasad, 2009;Graham et al, 2012), hair and memory loss, skin problems, weakening of body muscles, infertility in men and pneumonia in children (Stein et al, 2005;Das and Green, 2013).…”

Section: Zinc Deficiencymentioning

confidence: 99%

Rice Biofortification for Assessment of Hidden Hunger: A Review

Pippal¹,

Jain²,

Jain³

2017

Int.J.Curr.Microbiol.App.Sci

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How Much Nutritional Iron Deficiency in Humans Globally Is due to an Underlying Zinc Deficiency?

Cited by 85 publications

References 114 publications

Heavy Metals in Crop Plants: Transport and Redistribution Processes on the Whole Plant Level

Heavy Metals in Crop Plants: Transport and Redistribution Processes on the Whole Plant Level

Auxin signaling is closely associated with Zn-efficiency in rice (Oryza sativa L.)

Rice Biofortification for Assessment of Hidden Hunger: A Review

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