Physiological aspect of mugineic acid, a possible phytosiderophore of graminaceous plants

Takagi, S.; Nomoto, Kyosuke; Takemoto, Tsunematsu

doi:10.1080/01904168409363213

Cited by 525 publications

(353 citation statements)

References 7 publications

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“…The dicotyledons may increase iron availability in the rhizosphere by proton excretion (Römheld et al, 1984) and the release of reductants (Chaney et al, 1972). In contrast, the Gramineae release phytosiderophores (Takagi et al, 1984). The Fe 3þ / phytosiderophore complex crosses the plasmic membrane of root cells without iron reduction or chelate dissociation.…”

Section: Discussionmentioning

confidence: 99%

“…Iron availability is one of several key factors influencing siderophore production by pseudomonads, and it is difficult to estimate the actual level of soluble iron in the rhizosphere (Loper & Lindow, 1994). Plants have evolved different uptake systems for iron (Takagi et al, 1984;Marschner et al, 1986;Römheld, 1987). The dicotyledons may increase iron availability in the rhizosphere by proton excretion (Römheld et al, 1984) and the release of reductants (Chaney et al, 1972).…”

Section: Discussionmentioning

confidence: 99%

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**The global regulator GacA of Pseudomonas fluorescens CHA0 is required for suppression of root diseases in dicotyledons but not in Gramineae**

1997

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Pseudomonas fluorescens strain CHA0 suppresses various plant diseases caused by soil‐borne fungi. The pseudomonad produces the antimicrobial metabolites 2,4‐diacetylphloroglucinol (Phl), pyoluteorin (Plt) and hydrogen cyanide, which are important for disease suppression, as well as the siderophores pyoverdine (Pvd), salicylic acid (Sal) and pyochelin (Pch). In the current work, a derivative of CHA0 with a mutation in the global regulator gene gacA (GacA−), which is unable to produce Phl, Plt and HCN, failed to protect the dicotyledonous plants cress and cucumber against damping‐off caused by Pythium ultimum. In contrast, the GacA− mutant could still protect the Gramineae wheat and maize against damping‐off mediated by the same strain of P. ultimum, and wheat against take‐all caused by Gaeumannomyces graminis. However, the GacA− mutant overproduced Pch and Pvd. To gain more insight into disease protection afforded by the GacA− mutant, a GacA− Pvd− double mutant (strain CHA496) was constructed by gene replacement. Strain CHA496 overproduced Pch and Sal compared with CHA0 and protected wheat against P. ultimum and G. graminis, whereas cress and cucumber were not protected. Addition of FeCl3 repressed Pch and Sal production by strain CHA496 in vitro and impaired the protection of wheat in soil microcosms. In conclusion, a functional gacA gene was necessary for the protection of dicotyledons against root diseases, but not for that of Gramineae. Results indicated also that Pch and/or Sal were involved in the ability of the GacA− Pvd− mutant of CHA0 to suppress root diseases in Gramineae.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

**The global regulator GacA of Pseudomonas fluorescens CHA0 is required for suppression of root diseases in dicotyledons but not in Gramineae**

1997

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“…Under Fe deficiency, species of Poaceae enhance their Fe uptake by releasing non-proteinogenic amino acids, phytosiderophores (PS), from their roots which mobilize Fe from the soil by forming a chelate that is then taken up by the root (Takagi 1976 ;Takagi, Nomoto & Takemoto 1984 ;Ro$ mheld & Marschner, 1986). In previous research it was shown that calcicole grasses are better adapted to low Fe availability on calcareous sites, as a consequence of higher PS release rates and lower tissue Fe demand (Gries & Runge, 1992.…”

Section: mentioning

confidence: 99%

Copper‐deficiency‐induced phytosiderophore release in in the calcicole grass Hordelymus europaeus

1998

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Phytosiderophore (PS) release occurs under both iron and zinc deficiencies in representative Poaceae and has been speculated to be a general adaptive response to enhance the acquisition of micronutrient metals. We tested this hypothesis within an on-going study of the role of micronutrient metal nutrition for patterns of spontaneous vegetation in relation to soil pH and carbonate content. Hordelymus europaeus (L.) Harz, a negative grass species commonly found on soils rich in CaCO $ in Western Central Europe, was subjected to deficiencies of Fe, Zn, Mn and Cu using chelator-buffered nutrient solutions. PS release rates were determined at 3-5 d intervals during onset and development of deficiency symptoms. Plant dry matter yields and nutrient concentrations, measured at three time points were used to construct growth curves for calculation of PS release per unit root mass. In comparison with trace metal-sufficient control plants, dry matter production was markedly reduced in the Fe, Zn, Mn and Cudeficiency treatments, with final relative yields of 6, 11, 15 and 31 %, respectively. The phytosiderophore produced under Fe-and Cu-deficiency treatments was identified, using HPLC, as desoxymugineic acid. The highest rate of PS release (18 µmol g −" root d. wt in 2 h) was measured in the Fe-deficiency treatment, and there was substantial release in the Cu-deficiency treatment (7n25 µmol g −" root d. wt in 2 h). No PS release above control levels (2n6 µmol g −" root d. wt in 2 h) was observed in the Zn-or Mn-deficiency treatments (1n5 and 2n6 µmol g −" root d. wt in 2 h, respectively). It remains to be clarified whether PS release in response to Cu deficiency is a primary reaction to the deficiency, or is caused by a chain of events similar to that observed in Zndeficient wheat, which involves internal Fe deficiency. Our results suggest that PS release in the native plant species H. europaeus is a specific response to Fe and Cu deficiency and is not significantly induced in response to deficiencies of Zn and Mn. Induction of the PS mechanism in different plant species might be more diverse than previously thought.

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“…Data in the literature show that the secretion of PS from Fe-deficient barley roots occurs within a specific period of 4 to 6 h, which usually begins about 2 h after the onset of light (Takagi et al, 1984;Marschner et al, 1986). Fe uptake from Fe-rhizoferrin and other chelates by barley plants was measured in the morning and evening to investigate the influence of PS release on the Fe uptake from ferric chelates.…”

Section: Uptake and Translocation By Barley Plantsmentioning

confidence: 99%

“…The most common PS are MA, DMA, and epi-hydroxymugineic acid (Kawai et al, 1988). The secretion of PS from Fe-deficient barley and wheat roots was found to occur within a specific period of 4 to 6 h, which usually begins about 2 h after the onset of light (Takagi et al, 1984;Marschner et al, 1986;Zhang et al, 1991). It was later suggested that temperature, rather than a light signal, is the trigger for the initiation of MA release ; however, it has not been clarified yet whether other plant species share the same diurnal rhythm of PS release.…”

mentioning

confidence: 99%

The Role of Ligand Exchange in the Uptake of Iron from Microbial Siderophores by Gramineous Plants

et al. 1996

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Physiological aspect of mugineic acid, a possible phytosiderophore of graminaceous plants

Cited by 525 publications

References 7 publications

**The global regulator GacA of Pseudomonas fluorescens CHA0 is required for suppression of root diseases in dicotyledons but not in Gramineae**

**The global regulator GacA of Pseudomonas fluorescens CHA0 is required for suppression of root diseases in dicotyledons but not in Gramineae**

Copper‐deficiency‐induced phytosiderophore release in in the calcicole grass Hordelymus europaeus

The Role of Ligand Exchange in the Uptake of Iron from Microbial Siderophores by Gramineous Plants

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