Dinitrogen fixation and infection of grass leaves byPseudomonas rubrisubalbicans andHerbaspirillum seropedicae |
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Authors: | J P Pimentel F Olivares R M Pitard S Urquiaga F Akiba J Döbereiner |
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Institution: | (1) EMBRAPA, National Centre for Soil Biology Research (CNPBS/EMBRAPA), Universidade Federal Rural do Rio de Janeiro, Km 47, Seropédica, 23851 Rio de Janeiro, Brazil |
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Abstract: | Bacteria causing mottled stripe disease in sugar cane, known asPseudomonas rubrisubalbicans, were shown to be able to fix molecular N2 and to grow on it. The root associated diazotroph known asHerbaspirillum seropedicae, after artificial inoculation caused mottled stripe disease symptoms on sorghum and Napier grass but not on sugar cane. Both bacteria could be reisolated from leaves even 60 days after. Sugar cane leaves contained large numbers of these bacteria even in the uninoculated controls. Additional physiological characteristics of six strains ofP. rubrisubalbicans were compared with those of twoH. seropedicae strains and were shown to be very similar. |
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Keywords: | Herbaspirillum nitrogen fixation napier grass Pseudomonas rubrisubalbicans sorghum sugar cane |
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