Zinc biofortification of cereals: problems and solutions

Palmgren, Michael G.; Clemens, Stephan; Williams, Lorraine E.; Krämer, Ute; Borg, Søren; Schjørring, Jan K.; Sanders, Dale

doi:10.1016/j.tplants.2008.06.005

Cited by 478 publications

(340 citation statements)

References 103 publications

Supporting

Mentioning

326

Contrasting

Unclassified

Order By: Relevance

“…Foliar Zn applied is easily absorbed and transported through phloem as shown in wheat by using radio labeled Zn ( 65 Zn), especially in plants grown under low Zn supply (Haslett et al 2001;Erenoglu et al 2002). Although xylem transport of Zn has been indicated to be more important for Zn accumulation in rice grain than re-translocation of Zn from the leaves (Palmgren et al 2008), the results of this study, however, suggested that phloem transport of Zn from leaf and stem tissue may also play a greater role in enrichment of grains with Zn. In close agreement with the results presented in this paper, it has been shown very recently that soil-applied Zn fertilizers had very little effect on grain Zn in rice grown in five countries while spraying Zn to foliage caused very significant increases in grain Zn (Phattarakul et al 2012).…”

Section: Discussioncontrasting

confidence: 77%

Effect of different foliar zinc application at different growth stages on seed zinc concentration and its impact on seedling vigor in rice

Boonchuay

Çakmak

Rerkasem

et al. 2013

Soil Science and Plant Nutrition

132

View full text Add to dashboard Cite

This study evaluated how zinc (Zn) concentration of rice (Oryza sativa L.) seed may be increased and subsequent seedling growth improved by foliar Zn application. Eight foliar Zn treatments of 0.5% zinc sulfate (ZnSO 4 Á 7H 2 O) were applied to the rice plant at different growth stages. The resulting seeds were germinated to evaluate effects of seed Zn on seedling growth. Foliar Zn increased paddy Zn concentration only when applied after flowering, with larger increases when applications were repeated. The largest increases of up to ten-fold were in the husk, and smaller increases in brown rice Zn. In the first few days of germination, seedlings from seeds with 42 to 67 mg Zn kg À1 had longer roots and coleoptiles than those from seeds with 18 mg Zn kg À1 , but this effect disappeared later. The benefit of high seed Zn in seedling growth is also indicated by a positive correlation between Zn concentration in germinating seeds and the combined roots and shoot dry weight (r ¼ 0.55, p < 0.05). Zinc in rice grains can be effectively raised by foliar Zn application after flowering, with a potential benefit of this to rice eaters indicated by up to 55% increases of brown rice Zn, and agronomically in more rapid early growth and establishment.

show abstract

Section: Discussioncontrasting

confidence: 77%

Effect of different foliar zinc application at different growth stages on seed zinc concentration and its impact on seedling vigor in rice

Boonchuay

Çakmak

Rerkasem

et al. 2013

Soil Science and Plant Nutrition

132

View full text Add to dashboard Cite

show abstract

“…Zinc deficiency afflicts up to 40% of the world's human population, mainly in developing countries where people depend on cereal-rich diets for sustenance (29,30). Biofortification of crops with zinc, using plant breeding and other genetic technologies, offers a sustainable solution to this global problem (31,32). Achieving a plant-based solution to alleviate zinc deficiency has thus far been hampered by insufficient knowledge on the mechanisms and regulation of the zinc homeostasis network in plants (32,33).…”

Section: Discussionmentioning

confidence: 99%

“…Biofortification of crops with zinc, using plant breeding and other genetic technologies, offers a sustainable solution to this global problem (31,32). Achieving a plant-based solution to alleviate zinc deficiency has thus far been hampered by insufficient knowledge on the mechanisms and regulation of the zinc homeostasis network in plants (32,33). The identification of these transcription factors to regulate the zinc deficiency response may alter this for the better, as well as promote the development of zinc deficiency tolerant crops and of metal hyperaccumulator plants for phytoremediation of contaminated soil or water.…”

Section: Discussionmentioning

confidence: 99%

Arabidopsis thaliana transcription factors bZIP19 and bZIP23 regulate the adaptation to zinc deficiency

Assunção

Herrero

Lin

et al. 2010

Proc. Natl. Acad. Sci. U.S.A.

327

381

View full text Add to dashboard Cite

Zinc is an essential micronutrient for all living organisms. When facing a shortage in zinc supply, plants adapt by enhancing the zinc uptake capacity. The molecular regulators controlling this adaptation are not known. We present the identification of two closely related members of the Arabidopsis thaliana basic-region leucinezipper (bZIP) transcription factor gene family, bZIP19 and bZIP23, that regulate the adaptation to low zinc supply. They were identified, in a yeast-one-hybrid screening, to associate to promoter regions of the zinc deficiency-induced ZIP4 gene of the Zrt-and Irtrelated protein (ZIP) family of metal transporters. Although mutation of only one of the bZIP genes hardly affects plants, we show that the bzip19 bzip23 double mutant is hypersensitive to zinc deficiency. Unlike the wild type, the bzip19 bzip23 mutant is unable to induce the expression of a small set of genes that constitutes the primary response to zinc deficiency, comprising additional ZIP metal transporter genes. This set of target genes is characterized by the presence of one or more copies of a 10-bp imperfect palindrome in their promoter region, to which both bZIP proteins can bind. The bZIP19 and bZIP23 transcription factors, their target genes, and the characteristic cis zinc deficiency response elements they can bind to are conserved in higher plants. These findings are a significant step forward to unravel the molecular mechanism of zinc homeostasis in plants, allowing the improvement of zinc bio-fortification to alleviate human nutrition problems and phytoremediation strategies to clean contaminated soils.biofortification | zinc homeostasis regulation | plant nutrition | abiotic stress | adaptation Z inc is an essential cofactor for many transcription factors, protein interaction domains, and enzymes in plants (1). Plants are thought to control zinc homeostasis by using a tightly regulated network of zinc status sensors and signal transducers controlling the coordinated expression of proteins involved in zinc acquisition from soil, mobilization between organs and tissues, and sequestration within cellular compartments (2). Although candidate genes for the required proteins such as zinc transporters and chelator biosynthesizing enzymes are found, no regulator of such network was ever identified in plants.Zinc influx facilitators, members of the ZIP family of metal transporters, are thought to play a major role in zinc uptake in plants (3). In Arabidopsis there are 15 ZIP genes (4), with ZIP1, ZIP2, ZIP3, and IRT3 functionally characterized as zinc uptake transporters (3, 5). Gene expression analysis has shown that approximately half of the ZIP genes are induced in response to zinc deficiency (3,(5)(6)(7)(8). The ZIP4 gene in particular is strongly induced upon shortage in zinc supply (3,(6)(7)(8).We focused on the promoter of this zinc-deficiency-responsive gene as the starting point for unraveling the regulation of the zinc homeostasis network in plants. By using DNA fragments of the zincdeficiency-responsive Arabidopsi...

show abstract

“…An important determinant in biofertilization of cereal crops is the mobilization of micronutrient to edible parts of the plant (Palmgren et al 2008). When grown in Zn-deficient soils, Zn levels in wheat have been reported between 5-12 mg/kg (Erdal et al 2002).…”

Section: Pgpr Includingmentioning

confidence: 99%

PGPR mediated Zinc biofertilization of soil and its impact on growth and productivity of wheat

Sirohi

Upadhyay

Srivastava

et al. 2015

J. Soil Sci. Plant Nutr.

View full text Add to dashboard Cite

Objectives: This study describes Zinc biofortification of wheat using a rhizospheric isolate, Pseudomonas fluorescens strain Psd.Methods: The strain was used as a bio-ionculant in soil deficient in zinc and the plant-growth promoting potential and biofortification was assessed using a number of physical and biochemical parameters. The enzymatic studies indicated towards the zinc supply mediated by the strain Result: This plant-growth-promoting strain, apart from the Zn accumulation potential, has the ability to solubilise Zn and was also able to leach out Zn from ore-tailings. The application of a Zn-laden biomass of the strain in soil resulted in increased growth and productivity of wheat crop as demonstrated by pot experiments. The beneficial effect was also reflected in increased activities of some enzymes. In addition, grain Zn 2+ content was enhanced by ~85% in comparison to wheat grown in Zn 2+ -deficient soil.

show abstract

Zinc biofortification of cereals: problems and solutions

Cited by 478 publications

References 103 publications

Effect of different foliar zinc application at different growth stages on seed zinc concentration and its impact on seedling vigor in rice

Effect of different foliar zinc application at different growth stages on seed zinc concentration and its impact on seedling vigor in rice

Arabidopsis thaliana transcription factors bZIP19 and bZIP23 regulate the adaptation to zinc deficiency

PGPR mediated Zinc biofertilization of soil and its impact on growth and productivity of wheat

Contact Info

Product

Resources

About