Bacterial auxin signaling: comparative study of growth induction in Arabidopsis thaliana and Triticum aestivum

Authors : Basharat ALI

Pages : 1-9

Doi:10.3906/bot-1401-31

View : 15 | Download : 5

Publication Date : 0000-00-00

Article Type : Research Paper

Abstract :Auxin-producing rhizobacteria were evaluated for the role of their auxin signaling in enhancing the growth of Arabidopsis thaliana insert ignore into journalissuearticles values(L.); Heynh. and Triticum aestivum L. Arabidopsis thaliana wild type Columbia insert ignore into journalissuearticles values(Col-0); in comparison with phytohormone mutant lines aux1-7 insert ignore into journalissuearticles values(insensitive to auxin and ethylene);, axr4-1 insert ignore into journalissuearticles values(insensitive to auxin);, and eir1-1 insert ignore into journalissuearticles values(insensitive to ethylene); was used as a model system. Bacterization of wild type Col-0 recorded significant increases in shoot length insert ignore into journalissuearticles values(38%); and number of siliqua insert ignore into journalissuearticles values(180%); with Bacillus subtilis TpP-1 over the controls. Inoculation with aux1-7 and axr4-1 showed statistically comparable results for growth parameters as compared to their respective controls. Treatment of eir1-1 with Pseudomonas sp. AvH-4 and Bacillus subtilis TpP-1 recorded significant increases in shoot length insert ignore into journalissuearticles values(9%); and number of siliqua insert ignore into journalissuearticles values(20%);, respectively. The pattern of growth response of aux1-7, axr4-1, and eir1-1 indicated that bacterial auxin and ethylene signaling is involved in the growth promotion of A. thaliana. For T. aestivum, significant increases in number of tillers insert ignore into journalissuearticles values(74%); and seed weight insert ignore into journalissuearticles values(26%); were recorded with Pseudomonas sp. AvH-4. Results of this study suggested that growth induction by B. subtilis TpP-1, Pseudomonas sp. AvH-4, and Pseudomonas aeruginosa As-17 in A. thaliana is associated with bacterial auxin signaling.
Keywords : Arabidopsis, bacterial auxin, bacteria, interaction, plant growth promotion