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https://hdl.handle.net/1959.11/14126
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 | Handle Link: | https://hdl.handle.net/1959.11/14126 | 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 Details: | Nitrogen Fixation with Non-Legumes 1996: 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, Netherlands | Fields of Research (FoR) 2008: | 050209 Natural Resource Management 070306 Crop and Pasture Nutrition 050303 Soil Biology |
Socio-Economic Objective (SEO) 2008: | 820402 Rice 820507 Wheat 820599 Winter Grains and Oilseeds not elsewhere classified |
Peer Reviewed: | Yes | HERDC Category Description: | E1 Refereed Scholarly Conference Publication | Publisher/associated links: | http://trove.nla.gov.au/version/46517966 | Series Name: | Developments in Plant and Soil Sciences | Series Number : | 79 |
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Appears in Collections: | Conference Publication |
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