Ecophysiology of iron homeostasis in plants

Krohling, César Abel; Eutrópio, Frederico Jacob; Bertolazi, Amanda Azevedo; Dobbss, Leonardo Barros; Campostrini, Eliemar; Dias, Teresa; Ramos, Alessandro Coutinho

doi:10.1080/00380768.2015.1123116

Cited by 79 publications

(44 citation statements)

References 99 publications

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“…Overall, the photosynthetic machinery is known to be highly sensitive to Fe deficiency as compared to Zn owing to the role of Fe ions as co-factors in the key components of the photosynthetic machinery. There are two or three Fe atoms per PSII, 12 Fe atoms per PSI, five Fe atoms per cytochrome complex b6–f (Cyt b6–f) and two Fe atoms per ferredoxin molecule as reported by Briat et al [ 77 ] and Krohling et al [ 71 ].…”

Section: Discussionmentioning

confidence: 88%

“…The chlorophyll a-b binding protein 6A (ZmAffx.1219.1.S1_s_at) acts as a component of the light-harvesting complex (LHC) which is involved in the formation of a full-size NAD(P)H dehydrogenase-PSI super complex (NDH-PSI) that triggers cyclic and chlororespiratory electron transport in chloroplast thylakoids, especially under stress conditions [ 70 ]. Therefore, the Fe and Zn deficiency-induced overexpression of APOCYTOCHROME F, CHLOROPHYLL A-B BINDING PROTEIN 6A and FERREDOXIN 3 affects photosynthesis by disrupting the cellular redox poise and electron transfer mechanisms [ 69 , 71 ].…”

Section: Discussionmentioning

confidence: 99%

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Comparative Transcriptome Analysis of Iron and Zinc Deficiency in Maize (Zea mays L.)

Mallikarjuna

Thirunavukkarasu

Sharma

et al. 2020

Plants

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Globally, one-third of the population is affected by iron (Fe) and zinc (Zn) deficiency, which is severe in developing and underdeveloped countries where cereal-based diets predominate. The genetic biofortification approach is the most sustainable and one of the cost-effective ways to address Fe and Zn malnutrition. Maize is a major source of nutrition in sub-Saharan Africa, South Asia and Latin America. Understanding systems’ biology and the identification of genes involved in Fe and Zn homeostasis facilitate the development of Fe- and Zn-enriched maize. We conducted a genome-wide transcriptome assay in maize inbred SKV616, under –Zn, –Fe and –Fe–Zn stresses. The results revealed the differential expression of several genes related to the mugineic acid pathway, metal transporters, photosynthesis, phytohormone and carbohydrate metabolism. We report here Fe and Zn deficiency-mediated changes in the transcriptome, root length, stomatal conductance, transpiration rate and reduced rate of photosynthesis. Furthermore, the presence of multiple regulatory elements and/or the co-factor nature of Fe and Zn in enzymes indicate their association with the differential expression and opposite regulation of several key gene(s). The differentially expressed candidate genes in the present investigation would help in breeding for Fe and Zn efficient and kernel Fe- and Zn-rich maize cultivars through gene editing, transgenics and molecular breeding.

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Section: Discussionmentioning

confidence: 88%

Section: Discussionmentioning

confidence: 99%

Comparative Transcriptome Analysis of Iron and Zinc Deficiency in Maize (Zea mays L.)

Mallikarjuna

Thirunavukkarasu

Sharma

et al. 2020

Plants

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“…Interestingly, we observed a significant increase of Fe in both root and shoot wheat plants subjected to Ar/O 2 plasma treatment in seeds. Iron uptake is dependent on the plant’s ability to reduce Fe 3+ to Fe 2+ through the electrons at the cell surface 32 . It pinpoints that Ar/O 2 plasma treatment may also modulate electron discharge which in turn facilitate iron uptake in wheat plants.…”

Section: Discussionmentioning

confidence: 99%

Mechanisms and Signaling Associated with LPDBD Plasma Mediated Growth Improvement in Wheat

Rahman

Sajib

Rahi

et al. 2018

Sci Rep

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This study investigates the effect and mechanisms of low pressure dielectric barrier discharge (LPDBD) produced with Ar/O2 and Ar/Air technique causing biological stimulation leading to improved germination and growth in wheat. Both plasma treatments caused rougher and chapped seed surface along with noticeable improvement in seed germination in wheat. Beside this, seed H2O2 concentration significantly increased compared to controls subjected to Ar/O2 and Ar/Air while this phenomenon was more pronounced due to Ar/Air plasma. Analysis of plants grown from the plasma treated seeds showed significant improvement in shoot characteristics, iron concentration, total soluble protein and sugar concentration in comparison with the controls more efficiently due to Ar/O2 plasma than that of Ar/Air. Further, none of the plasma treatments caused membrane damage or cell death in root and shoot of wheat. Interestingly, Ar/O2 treated plants showed a significant increase (2-fold) of H2O2 compared to controls in both root and shoot, while Ar/Air plasma caused no changes in H2O2. This phenomenon was supported by the biochemical and molecular evidence of SOD, APX and CAT in wheat plants. Plants derived from Ar/O2 treated seeds demonstrated a significant increase in SOD activity and TaSOD expression in roots of wheat, while APX and CAT activities along with TaCAT and TaAPX expression showed no significant changes. In contrast, Ar/Air plasma caused a significant increase only in APX activity in the shoot. This suggests that Ar/O2 plasma caused a slight induction in H2O2 accumulation without triggering the H2O2 scavengers (APX and CAT) and thus, efficiency affect growth and development in wheat plants. Further, grafting of control and Ar/O2 treated plants showed a significant increase in shoot biomass and H2O2 concentration in grafts having Ar/O2 rootstock regardless of the type scion attached to it. It indicates that signal driving Ar/O2 plasma mediated growth improvement in wheat is possibly originated in roots. Taken together, this paper delivers new insight into the mechanistic basis for growth improvement by LPDBD technique.

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“…Research on Fe homeostasis in plants has mainly focused on Fe uptake mechanisms in the roots and Fe distribution within the plants, resulting in the identification of several molecular factors involved in wholeplant Fe homeostasis (for recent reviews, see Kobayashi and Nishizawa, 2012;Brumbarova et al, 2015, Krohling et al, 2016. In addition to Fe uptake and redistribution, plants can also acclimate their metabolism when Fe supply cannot meet all needs (López-Millán et al, 2013).…”

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confidence: 99%