Journal ArticleDOI
Iron-deficiency specifically limits nodule development in peanut inoculated with Bradyrhizobium sp
TLDR
It is concluded that the failure of the infecting rhizobia to obtain adequate amounts of iron from the plant results in arrested nodule development and a failure of nitrogen fixation.Abstract:
Severely iron-deficient peanuts (Arachis hypogaaea L.) grown on calcareous soils in central Thailand failed to nodulate until given foliar iron applications. Glasshouse experiments were conducted on two cultivars (Tainan 9 and Robut 33-1) to identify which stage of the nodule symbiosis was most sensitive to iron-deficiency. Iron-deficiency did not limit growth of soil or rhizosphere populations of peanut liradyrhizobium. Similar numbers of root nodule initials formed in the roots of both control and iron-sprayed plants, showing that iron-deficiency did not directly affect root infection and nodule initiation. Plants sprayed with iron produced greater numbers of excisable nodules and carried a greater nodule mass than untreated plants. Five days after iron application, nodules on sprayed plants of CV. Tainan 9 contained 200-fold higher bacteroid numbers per unit weight and 14-fold higher concentrations of leghaemoglobain. The onset of nitrogenase activity was also delayed by iron deficiency in both cultivars. Tainan 9 appeared more sensitive to iron-deficiency than Robut 33-1 in terms of nodule mass produced, but both cultivars showed the same effect of iron-deficiency on nitrogenase activity per plant. It is concluded that the failure of the infecting rhizobia to obtain adequate amounts of iron from the plant results in arrested nodule development and a failure of nitrogen fixation.read more
Citations
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Journal ArticleDOI
Iron, ferritin, and nutrition
TL;DR: An understanding of the chemistry and biology of each type of dietary iron source (ferritin, heme, Fe2+ ion, etc.), and of the interactions dependent on food sources, genes, and gender, is required to design diets that will eradicate global iron deficiency in the twenty-first century.
Journal ArticleDOI
Genetic Organization of the Region Encoding Regulation, Biosynthesis, and Transport of Rhizobactin 1021, a Siderophore Produced by Sinorhizobium meliloti
Damien Lynch,John T. O'Brien,Timothy J. Welch,Paul M. Clarke,Páraic Ó Cuív,Jorge H. Crosa,Michael O'Connell +6 more
TL;DR: Eight genes have been identified that function in the regulation, biosynthesis, and transport of rhizobactin 1021, a hydroxamate siderophore produced under iron stress by Sinorhizobium meliloti, and were shown to constitute an operon that is repressed under iron-replete conditions.
Journal ArticleDOI
Citrate as a siderophore in Bradyrhizobium japonicum.
TL;DR: A role for ferric citrate in the iron nutrition of this strain, which has been shown to be an efficient nitrogen-fixing strain on a variety of soybean cultivars, is indicated.
References
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Journal ArticleDOI
Some Observations on Infection of Arachis hypogaea L. by Rhizobium
TL;DR: The infection process in Arachis hypogaea by rhizobia differs from that normally found in Trifolium spp.
Journal ArticleDOI
Iron nutrition in plants: A world overview
TL;DR: Iron deficiency and toxicity are functions of the whole soil system and its effect on the availability of iron to the plant, and an understanding of this is essential to an appreciation of the problems.
Journal ArticleDOI
Factors affecting the reduction of acetylene by root nodules of lupinus species
TL;DR: In this paper, a number of parameters affecting acetylene reduction by root nodules of Lupinus angustifolius, L. cosentinii and L. luteus have been studied.
Journal ArticleDOI
Isolation and characterisation of catechol-like siderophore from cowpea Rhizobium RA-1
TL;DR: Maximum production of siderophore was found at 36 h of growth of cowpea Rhizobium RA-1, and Glycine and threonine were detected in the sidersophore.
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