Transport of iron into leaves following iron resupply to iron‐stressed sugar beet plants

Young, Terry; Terry, Norman

doi:10.1080/01904168209363061

Cited by 28 publications

(10 citation statements)

References 16 publications

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“…Although changes in Fe uptake are correlated with changes in reductase activity, the question as to whether the increase in uptake rates is because of enhanced transporter activity, a consequence of increased reduction capacity, or both, is difficult to answer and experiments addressed to this issue have yielded somewhat conflicting data. Young & Terry (1982) showed that Fe deficiency induced an increase in both uptake rates and leaf concentration of Fe when Fe was supplied as Fe# + via the nutrient solution, pointing to enhanced activity of a plasmalemma Fe# + -transport protein. By contrast, Grusak et al (1990a) found similar ratios of Fe# + absorbed : Fe() reduced in Fe-replete and Fe-deficient pea roots.…”

Section: Iron Uptakementioning

confidence: 99%

Mechanisms and regulation of reduction‐based iron uptake in plants

1999

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Despite the usually high abundance of iron (Fe) in soils, the low solubility of Fe-bearing minerals restricts the available Fe pools in most aerobic soils to levels that are far below those required for microbial or plant growth. To acquire the necessary amounts of Fe from the environment, organisms have evolved mechanisms that enhance the solubility and dissolution rate of Fe() oxyhydroxides prevailing in aerobic soils. Chemically, these mechanisms are based on weakening of the Fe$O bond by reduction, chelation and protonation. Physiologically, two distinct and in all known cases mutually exclusive strategies can be distinguished : the excretion of siderophores capable of solubilizing external ferric Fe and subsequent uptake of the ferric siderophore complex ; and reduction of Fe() prior to uptake of the more soluble Fe# + ion. With the exception of graminaceous species, in which Fe uptake is based on the former mechanism, the latter strategy is found in all cormophytes and certain algae, yeast and bacteria. In higher plants, the increase in their capacity to convert extracellular ferric to ferrous Fe is part of a series of physiological and morphological events that act in concert to achieve appropriate internal levels of Fe. It is this amalgam of features that determines the Fe efficiency of a species or cultivar that in turn affects the yield of economically important plants and the natural distribution of species. Adaptive changes to limited Fe availability have been studied at the molecular, physiological and whole-plant level. This review summarises current knowledge of the components of reduction-based Fe uptake in plants and presents an integrated view of the present understanding of mechanisms that control the rate and extent of Fe absorption by roots.

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Section: Iron Uptakementioning

confidence: 99%

Mechanisms and regulation of reduction‐based iron uptake in plants

1999

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“…Next, addition of excess iron in the culture medium of iron-starved plantlets leads to a large iron influx into the plant [53]. This iron is translocated within 3 h into the leaves to restore the essential photosynthetic process in chloroplasts [57,58]. During this period of regreening, which takes about 24-48 h, ferritins are used as a safe iron buffer and transiently store the iron required for the synthesis of iron-containing proteins.…”

Section: Iron-dependent Regulation Of Ferritin Gene Expressionmentioning

confidence: 99%

Regulation of plant ferritin synthesis: how and why

Briat¹,

Lobréaux²,

Grignon³

et al. 1999

Cellular and Molecular Life Sciences (CMLS)

125

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Plant ferritins are key iron-storage proteins that share important structural and functional similarities with animal ferritins. However, specific features characterize plant ferritins, among which are plastid cellular localization and transcriptional regulation by iron. Ferritin synthesis is developmentally and environmentally controlled, in part through the differential expression of the various members of a small gene family. Furthermore, a strict requirement for plant ferritin synthesis regulation is attested to by alterations of the photosynthetic apparatus and of iron homeostasis in transgenic tobaccos overexpressing these proteins. Plant ferritin gene regulation appears to consist of a complex interplay of transcriptional and posttranscriptional mechanisms, involving cellular relays such as plant hormones, oxidative steps and Ser/Thr phosphatase.

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“…Seeds were germinated and grown in vermiculite for two weeks. Seedlings were grown for two more weeks in nutrient solution (in 3/8-strength Hoagland's nutrient solution with 22.4 laM Fe and then transplanted (four plants per bucket) to 20-1 plastic buckets lined with polyethylene bags and containing half-strength Hoagland's solution (Young and Terry 1982) with either 0 or 44.8 I~M Fe. Iron was added in the chelated form of Fe-EDDHA (Sequestrene 138; Ciba-Geigy, Barcelona, Spain).…”

Section: Plant Culture Sugar Beet (Beta Vulgaris L Monohil Hybrid;mentioning

confidence: 99%

Flavin excretion from roots of iron-deficient sugar beet (Beta vulgaris L.)

Susín

Abián

Peleato

et al. 1994

Planta

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Abstract. The characteristics of flavin excretion from iron-deficient sugar-beet roots have been studied. Roots from iron-deficient sugar beet excreted flavins when plants were allowed to decrease the pH of the nutrient solution, but not when plants were grown in nutrient solutions buffered at high pH. As shown by reversedphase high-performance liquid chromatography, the two major flavins whose excretion was induced by iron deficiency were different from riboflavin, FMN and FAD. These flavins have been identified as riboflavin 3'-sulfate and riboflavin 5'-sulfate by electrospray-mass spectrometry, inductively coupled plasma emission spectroscopy, infrared spectrometry and 1H-nuclear magnetic resonance. We have characterized the time courses of accumulation of the different flavins in the nutrient solution and considered several possible roles for flavin excretion in iron acquisition.

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Transport of iron into leaves following iron resupply to iron‐stressed sugar beet plants

Cited by 28 publications

References 16 publications

Mechanisms and regulation of reduction‐based iron uptake in plants

Mechanisms and regulation of reduction‐based iron uptake in plants

Regulation of plant ferritin synthesis: how and why

Flavin excretion from roots of iron-deficient sugar beet (Beta vulgaris L.)

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