Analysis of nitrogen fixation and regulatory genes in the sugar cane endophyte Acetobacter diazotrophicus

Lee, Sunhee; Sevilla, Myrna; Meletzus, Dietmar; Teixeira, K. R. dos S.; Oliveira, A. de; Perlova, Lena; Nawroth, Roman; Baldani, Ivo; Kennedy, Christina

doi:10.1007/978-94-011-5232-7_2

Cited by 4 publications

(1 citation statement)

References 23 publications

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“…Molecular studies with A. diazotrophicus revealed that nitrogen fixation genes and regulatory genes (nif and fix genes) have similarities with nif genes of other nitrogenfixing bacteria (Lee et al, 1998;Sevilla et al, 1997). Mutants unable to fix nitrogen could colonize sugarcane plants.…”

Section: Endophytic Diazotrophic Bacteriamentioning

confidence: 99%

Endophytic microorganisms: a review on insect control and recent advances on tropical plants

Azevedo¹,

Maccheroni²,

Pereira³

et al. 2000

Electron. J. Biotechnol.

558

320

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In the past two decades, a great deal of information on the role of endophytic microorganisms in nature has been collected. The capability of colonizing internal host tissues has made endophytes valuable for agriculture as a tool to improve crop performance. In this review, we addressed the major topics concerning the control of insects-pests by endophytic microorganisms. Several examples of insect control are described, notably those involving the interactions between fungi and grazing grasses from temperate countries. The mechanisms by which endophytic fungi control insect attacks are listed and include toxin production as well as the influence of these compounds on plant and livestock and how their production may be affected by genetic and environmental conditions. The importance of endophytic entomopathogenic fungi for insect control is also addressed. As the literature has shown, there is a lack of information on endophytes from tropical hosts, which are more severely affected by pests and diseases. The natural and biological control of pests and diseases affecting cultivated plants has gained much attention in the past decades as a way of reducing the use of chemical products in agriculture. Biological control has been frequently used in Brazil, supported by the development of basic and applied research on this field not only in our country but also in South America as it can be found in several reviews (Lecuona, 1996;Alves, 1998;Melo and Azevedo, 1998). In fact, by having vast agriculturable areas and most of its territory in the tropical region, Brazil and all Latin America, show their agriculture severely affected by agricultural pests. The use of agrochemicals, although decreasing the attack of insects and phytopathogenic microorganisms, still represents a high risk to field workers and consumers. In addition, their use is, in certain cases, economically unviable. The control of pests and diseases by means of biological processes i. e., use of entomopathogenic microorganisms or those that inhibit/antagonise other microorganisms pathogenic to plants, is an alternative that may contribute to reduce or eliminate the use of chemical products in agriculture.

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Section: Endophytic Diazotrophic Bacteriamentioning

confidence: 99%

Endophytic microorganisms: a review on insect control and recent advances on tropical plants

Azevedo¹,

Maccheroni²,

Pereira³

et al. 2000

Electron. J. Biotechnol.

558

320

View full text Add to dashboard Cite

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Endophytic colonization of plant roots by nitrogen-fixing bacteria

2003

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The current and potential contribution of asymbiotic nitrogen fixation to nitrogen requirements on farms: a review

Kennedy

Islam²

2001

Aust. J. Exp. Agric.

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Significant levels of biological nitrogen fixation from sources other than nodulated legumes have become a tantalizing prospect for decades. Since the benefit to agriculture of nitrogen fixation from nodulated legumes was established, there have been widespread efforts to promote the use of various asymbiotic diazotrophic bacteria to fix extra nitrogen in soil. Despite much optimism by scientists and farmers, this prospect remains to be realised. Recently, the prospect has been pursued with renewed enthusiasm and several commercialised products have appeared. What are the reasons for this fresh enthusiasm? Are the new products based on realistic assessments of their biological potential? Why has it taken so long to advance to a stage where there is still only limited evidence that verifies hope becoming reality?This review assesses the current contribution from asymbiotic nitrogen fixation and re-assesses the prospects for greater contributions from this source. Among the many aspects of this multi-faceted subject that will be considered are: (i) the range of free-living microbial strains currently contributing to signficant asymbiotic nitrogen fixation; (ii) the significance of nitrogen-fixing microbes naturally associated with plants; (iii) the significance of endophytic systems and their role in sugarcane and other Gramineae; (iv) the possibility of extending this range by introducing new strains or discovering new systems capable of contributing additional nitrogen fixation.The case will be made that conditions providing a sustainable contribution for more than a short time are usually missing in such systems so that spontaneous biological nitrogen fixation is usually transient. It will be argued further that if all the positive factors controlling spontaneity at the biothermodynamic level are exploited, significant biological nitrogen fixation may soon be achieved in some of these systems on farms.

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Analysis of nitrogen fixation and regulatory genes in the sugar cane endophyte Acetobacter diazotrophicus

Cited by 4 publications

References 23 publications

Endophytic microorganisms: a review on insect control and recent advances on tropical plants

Endophytic microorganisms: a review on insect control and recent advances on tropical plants

Endophytic colonization of plant roots by nitrogen-fixing bacteria

The current and potential contribution of asymbiotic nitrogen fixation to nitrogen requirements on farms: a review

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