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Title: Prospects for facilitated evolution of effective N₂-fixing associations with cereals: comparative performance of 'Azospirillum brasilense' Sp7-S with various free-living diazotrophs in para-nodulated wheat
Contributor(s): Kennedy, Ivan R (author); Katupitiya, Sunietha (author); Yu, Daiguan (author); Gilchrist, Kate (author); Deaker, Rosalind (author); Pereg, Lily  (author); Wood, Craig (author)
Publication Date: 1998
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Abstract: By analogy with N₂-fixing sugar cane, achieving an effective N₂-fixing association between cereals and diazotrophs may require an endophytic mode of colonization, allowing better protection from oxygen and improved access to carbon substrates. Using nifA-lacZ as a genetic marker on a broad host-range plasmid pVK100, inserted into a range of free-living and associative N₂-fixing organisms, it has been possible to define their mode of colonization of the roots of wheat seedlings in addition to measuring the associated rates of nitrogen fixation. Of these bacterial strains, only 'Herbaspirillum seropedicae', 'Azorhizobium caulinodans' and a mutant strain of 'Azospirillum brasilense' (Sp7-S) displayed significant endophytic colonization of 2,4-D-treated wheat seedlings. By contrast, 'Acetobacter diazotrophicus', 'Azotobacter vinelandii', 'Derxia gummosa' and other 'Azospirillum' strains colonized at the rhizoplane. This chapter discusses these modes of colonization and the probable need for a stepwise process of facilitated evolution of selected diazatrophs and plants before an effective association can be achieved.
Publication Type: Conference Publication
Conference Name: 7th International Symposium on Nitrogen Fixation with Non-Legumes, Faisalabad, Pakistan, 16th - 21st October, 1996
Conference Details: 7th International Symposium on Nitrogen Fixation with Non-Legumes, Faisalabad, Pakistan, 16th - 21st October, 1996
Source of Publication: Nitrogen Fixation with Non-Legumes: Proceedings of the 7th International Symposium on Nitrogen Fixation with Non-Legumes, p. 109-124
Publisher: Kluwer Academic Publishers
Place of Publication: Dordrecht, The Netherlands
Field of Research (FOR): 050209 Natural Resource Management
070306 Crop and Pasture Nutrition
050303 Soil Biology
Peer Reviewed: Yes
HERDC Category Description: E1 Refereed Scholarly Conference Publication
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Series Name: Developments in Plant and Soil Sciences
Series Number : 79
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