Bacterial Endophytes and Their Interactions with Hosts
Tóm tắt
Recent molecular studies on endophytic bacterial diversity have revealed a large richness of species. Endophytes promote plant growth and yield, suppress pathogens, may help to remove contaminants, solubilize phosphate, or contribute assimilable nitrogen to plants. Some endophytes are seed-borne, but others have mechanisms to colonize the plants that are being studied. Bacterial mutants unable to produce secreted proteins are impaired in the colonization process. Plant genes expressed in the presence of endophytes provide clues as to the effects of endophytes in plants. Molecular analysis showed that plant defense responses limit bacterial populations inside plants. Some human pathogens, such as Salmonella spp., have been found as endophytes, and these bacteria are not removed by disinfection procedures that eliminate superficially occurring bacteria. Delivery of endo-phytes to the environment or agricultural fields should be carefully evaluated to avoid introducing pathogens.
Từ khóa
Tài liệu tham khảo
α Proteobacteria Azorhizobium caulinodans Rice Engelhard et al. 2000 Azospirillum brasilense Banana Weber et al. 1999 Azospirillum amazonense Banana, pineapple Weber et al. 1999 Bradyrhizobium japonicum Rice Chantreuil et al. 2000 Gluconacetobacter diazotrophicus Sugarcane, coffee Cavalcante and Döbereiner 1988; Jiménez-Salgado et al. 1997 Methylobacterium mesophilicumaCitrus plants Araujo et al. 2002 Methylobacterium extorquens Scots pine, citrus plants Araujo et al. 2002; Pirttilä et al. 2004 Rhizobium leguminosarum Rice Yanni et al. 1997 Rhizobium (Agrobacterium) radiobacter Carrot, rice Surette et al. 2003 Sinorhizobium meliloti Sweet potato Reiter et al. 2003 Sphingomonas paucimobilisaRice Engelhard et al. 2000
β Proteobacteria Azoarcus sp. Kallar grass, rice Engelhard et al. 2000; Reinhold-Hurek et al. 1993 Burkholderia pickettiiaMaize McInroy and Kloepper 1995 Burkholderia cepaciabYellow Iupine, citrus plants Araujo et al. 2001; Barac et al. 2004 Burkholderia sp. Banana, pineapple, rice Weber et al. 1999; Engelhard et al. 2000 Chromobacterium violaceumaRice Phillips et al. 2000 Herbaspirillum seropedicae Sugarcane, rice, maize, sorghum, banana Olivares et al. 1996; Weber et al. 1999 Herbaspirillum rubrisulbalbicans Sugarcane Olivares et al. 1996
γ Proteobacteria Citrobacter sp. Banana Martínez et al. 2003 Enterobacter spp. Maize McInroy and Kloepper 1995 Enterobacter sakazakiiaSoybean Kuklinsky-Sobral et al. 2004 Enterobacter cloacaeaCitrus plants, maize Araujo et al. 2002; Hinton et al. 1995 Enterobacter agglomeransaSoybean Kuklinsky-Sobral et al. 2004 Enterobacter asburiae Sweet potato Asis and Adachi 2003 Erwinia sp. Soybean Kuklinsky-Sobral et al. 2004 Escherichia colibLettuce Ingham et al. 2005 Klebsiella sp. Wheat, sweet potato, rice Engelhard et al. 2000; Iniguez et al. 2004; Reiter et al. 2003 Klebsiella pneumoniaebSoybean Kuklinsky-Sobral et al. 2004 Klebsiella variicolabBanana, rice, maize, sugarcane Rosenblueth et al. 2004. Klebsiella terrigenaaCarrot Surette et al. 2003 Klebsiella oxytocabSoybean Kuklinsky-Sobral et al. 2004 Pantoea sp. Rice, soybean Kuklinsky-Sobral et al. 2004; Verma et al. 2004 Pantoea agglomerans Citrus plants, sweet potato Araujo et al. 2001, 2002; Asis and Adachi 2003 Pseudomonas chlororaphis Marigold (Tagetes spp.), carrot Sturz and Kimpinski 2004; Surette et al. 2003 Pseudomonas putidaaCarrot Surette et al. 2003 Pseudomonas fluorescens Carrot Surette et al. 2003 Pseudomonas citronellolis Soybean Kuklinsky-Sobral et al. 2004 Pseudomonas synxantha Scots pine Prittilä et al. 2004 Salmonella entericabAlfalfa, carrot, radish, tomato Cooley et al. 2003; Guo et al. 2002; Islam et al. 2004 Serratia sp. Rice Sandhiya et al. 2005 Serratia marcescensaRice Gyaneshwar et al. 2001 StenotrophomonasaDune grasses (Ammophila arenaria and
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