The central role of microbial activity for iron acquisition in maize and sunflower

Masalha, Jaber; Kosegarten, Harald; Elmacı, Ömer Lütfü; Mengel, K.

doi:10.1007/s003740050021

Cited by 207 publications

(99 citation statements)

References 37 publications

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“…We believe that in our experimental conditions, Fe in potted trees was sufficient to prevent leaf chlorosis but insufficient to avoid a growth reduction. Similar results were observed on maize, sunflower (Masalha et al 2000) peach (Shi et al 1993) and grapevine (Gruber and Kosegarten 2002), indicating that from an agronomical standpoint, the reduction of tree growth is an important index for an early diagnosis of Fe chlorosis, the occurrence of which anticipates leaf discoloration. Afterwards, leaf chlorosis symptoms clearly appeared in control plants in the second season of experiment.…”

Section: Discussionsupporting

confidence: 72%

Effectiveness ofAmaranthus retroflexusL. aqueous extract in preventing iron chlorosis of pear trees (Pyrus communisL.)

Sorrenti

Toselli

Marangoni

2011

Soil Science and Plant Nutrition

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The aim of this study was to evaluate the effectiveness of soil-applied aqueous extract of Amaranthus retroflexus L. in preventing lime-induced iron (Fe) chlorosis of pear trees (Pyrus communis L.). Tree growth, nutritional status, yield and fruit quality were also assessed. The aqueous extract was obtained by soaking dried and ground canopy (epigeal part) of spontaneous A. retroflexus plants in tap water. A. retroflexus extract was chosen because of its ability to solubilize Fe from calcareous soil, which was found to be 100-fold higher than deionized water alone. Two experiments were carried out (controlled environment and commercial field conditions) where soil-applied aqueous extract of A. retroflexus alone or mixed with iron sulfate (FeSO 4 ) was compared with synthetic Fe-chelate and an untreated control. Soil-applied aqueous extract of A. retroflexus increased shoot length, leaf SPAD and total plant biomass in controlled environment. In the commercial orchard control trees showed severe leaf Fe-chlorosis symptoms effectively prevented by Fe-chelate. The supply of A. retroflexus aqueous extract improved Fe nutrition of trees, particularly when enriched with FeSO 4 . Fe-chelate increased tree yield but decreased fruit weight, leaf potassium (K) and manganese (Mn) concentration. At harvest, all strategies raised fruit soluble solid concentration compared to the untreated control. Results showed that soil-applied A. retroflexus aqueous extract improved Fe nutritional status of pear trees, probably because of the natural Fe chelating capacity of the compounds released by its tissues.

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Section: Discussionsupporting

confidence: 72%

Effectiveness ofAmaranthus retroflexusL. aqueous extract in preventing iron chlorosis of pear trees (Pyrus communisL.)

Sorrenti

Toselli

Marangoni

2011

Soil Science and Plant Nutrition

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“…However, enough Fe cannot be acquired by either strategy I or II plants grown under high alkaline pH conditions. Importantly, sunflower and maize plants grown in sterilized soils display poor growth performance and Fe deficiency-induced chlorosis compared with the controls grown in no-sterilized soils (Masalha et al 2000). Moreover, the growth of sorghum and rape was seriously repressed in sterilized soils, but recovered after the addition of Fe source into soils, indicating that certain soil microbes may facilitate plants to take up Fe from soils (Rroco et al 2003).…”

Section: Research Articlementioning

confidence: 99%

Improved iron acquisition ofAstragalus sinicusunder low iron-availability conditions by soil-borne bacteriaBurkholderia cepacia

Zhou

Zhu

et al. 2017

Journal of Plant Interactions

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Soil bacteria can assist plant growth and increase uptake of nutrient elements, the question arises as to whether beneficial soil microbes confer augmented iron (Fe) content of host plants under Fe limited conditions. Herein, a novel strain of Burkholderia cepacia (strain JFW16) was isolated from rhziospheric soils of Astragalus sinicus grown under alkaline conditions. Inoculation of plants with B. cepacia JFW16 displayed increased endogenous Fe content compared with non-inoculated plants. Growth promotion and enhanced photosynthetic capacity were also observed for the inoculated plants. The inoculation with JFW16 significantly increased the rhizospheric acidification, and up-regulated the transcription of some Fe acquisition-associated genes in Astragalus sinicus. Moreover, the metabolic pathways of flavins were remarkably enhanced in the inoculated plants, showing the increased biosynthesis and release of flavins in roots. Collectively, these findings demonstrated the potential of B. cepacia JFW16 to improve Fe assimilation in agricultural crops. ARTICLE HISTORY

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“…It is reported that under non-sterile soil system, plants showed no iron-deficiency symptoms and have fairly high iron level in roots in contrast to plants grown in sterile system. This can attribute to rhizospheric microbial activity, which plays an important role in iron acquisition (Masalha et al, 2000).…”

Section: Plant-growthmentioning

confidence: 99%

“…For example, Masalha et al(2000) reported that plants grown under non-sterile soil systems were better in terms of iron nutrition to those grown under sterile condition. Their data emphasize the role of microbial community on the iron nutrition of plants.…”

Section: Plant-growthmentioning

confidence: 99%

Role of soil rhizobacteria in phytoremediation of heavy metal contaminated soils

Jing

2007

J. Zhejiang Univ. - Sci. B

404

159

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Heavy metal pollution of soil is a significant environmental problem and has its negative impact on human health and agriculture. Rhizosphere, as an important interface of soil and plant, plays a significant role in phytoremediation of contaminated soil by heavy metals, in which, microbial populations are known to affect heavy metal mobility and availability to the plant through release of chelating agents, acidification, phosphate solubilization and redox changes, and therefore, have potential to enhance phytoremediation processes. Phytoremediation strategies with appropriate heavy metal-adapted rhizobacteria have received more and more attention. This article paper reviews some recent advances in effect and significance of rhizobacteria in phytoremediation of heavy metal contaminated soils. There is also a need to improve our understanding of the mechanisms involved in the transfer and mobilization of heavy metals by rhizobacteria and to conduct research on the selection of microbial isolates from rhizosphere of plants growing on heavy metal contaminated soils for specific restoration programmes.

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The central role of microbial activity for iron acquisition in maize and sunflower

Cited by 207 publications

References 37 publications

Effectiveness ofAmaranthus retroflexusL. aqueous extract in preventing iron chlorosis of pear trees (Pyrus communisL.)

Effectiveness ofAmaranthus retroflexusL. aqueous extract in preventing iron chlorosis of pear trees (Pyrus communisL.)

Improved iron acquisition ofAstragalus sinicusunder low iron-availability conditions by soil-borne bacteriaBurkholderia cepacia

Role of soil rhizobacteria in phytoremediation of heavy metal contaminated soils

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