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Htwe, A.Z., Yamakawa, T., Moe, K. and Dien D.C. (2015) Symbiotic Effectiveness of Different Indigenous Bradyrhizobium Strains on Selected Rj-Genes Harboring Myanmar Soybean Cultivars. African Journal of Microbiological Research, 9, 2345-2353.
http://dx.doi.org/10.5897/AJMR2015.7751

has been cited by the following article:

  • TITLE: Low-Density Co-Inoculation with Bradyrhizobium japonicum SAY3-7 and Streptomyces griseoflavus P4 Promotes Plant Growth and Nitrogen Fixation in Soybean Cultivars

    AUTHORS: Aung Zaw Htwe, Takeo Yamakawa

    KEYWORDS: Brayrhizobium japonicum SAY3-7, Streptomyces griseoflavus P4, Inoculation Densities, Co-Inoculation, Soybean, Nitrogen Fixation

    JOURNAL NAME: American Journal of Plant Sciences, Vol.7 No.12, August 24, 2016

    ABSTRACT: Inoculation density has a marked effect on nodulation and N fixation in soybean (Glycine max L.). Therefore, we conducted this study to determine the optimal inoculation density of Bradyhizobium japonicum SAY3-7 (SAY3-7) and Streptomyces griseoflavus P4 (P4) for plant growth, nodulation, and N fixation, and to investigate the effect of co-inoculation on selected soybean cultivars, using the optimal inoculation density. Nitrogen fixation, in terms of an acetylene reduction activity value, was measured using a flame ionization gas chromatograph. In this study, low-density single inoculation with P4 (105 or 106 cells mL-1) was associated with the highest plant biomass, compared with normal- and high-density single inoculation with P4 (107 or 108 cells mL-1). Moreover, low-density single or co-inoculations with SAY3-7 and/or P4 produced the highest nodule biomass and highest nitrogenase activity, compared with single or dual inoculation at other inoculation densities. Therefore, we evaluated low-density co-inoculation with P4 and SAY3-7, at the rate of 105 cells mL-1, on selected soybean cultivars. Low-density co-inoculation increased the plant biomass, compared with un-inoculated plants. The effects of single and co-inoculation on nodulation did not differ significantly for any of the cultivars, except “Yezin-9” in the first experiment and “Shan Seine” in the second experiment. Low-density inoculation with both bacteria increased N fixation by 15% - 75% for seven of the cultivars in the first experiment and by 15% - 39% for three of the cultivars in the second experiment, compared with single inoculation with SAY3-7. Based on the overall results, we concluded that low-density co-inoculation with P4 and SAY3-7 gave improved plant growth and N fixation.