A Time Course Study and Competition between Rhizobia-Affecting Nodulation in Two Soybean Genotypes | ||
| Egyptian Journal of Soil Science | ||
| Article 4, Volume 54, Issue 3, September 2014, Pages 237-247 PDF (363.39 K) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/ejss.2014.124 | ||
| Abstract | ||
| greenhouse experiment was conducted to evaluate the time course of nodulation and completion between strains USDA 123 and CB 1809 on Williams soybean and on P1 377578 (#671). This P1 has been shown to restrict nodulation and competition of USDA 123. The study was performed using vermiculite and fine sandy loam soil as growth media. Nodulation and competition in both medium were evaluated at 4, 6, 8 and 10 weeks. Three additional treatments included delayed inoculation of CB 1809 at 1, 2 and 4 weeks after inoculation the soil with USDA 123 were also performed. Averaged over the dates, strain USDA 123 produced 35 and 37%, respectively of the nodule mass and number on P1 377578 as compared to CB1809. In competition for nodulation in vermiculite, USDA 123 formed 43, 80, 62 and 64% of the nodules on Williams at 4, 6, 8 and 10 weeks, respectively, while only formed 0, 16, 9 and 16 % of the nodule on P1 # 671. In soil, USDA 123 formed 95% or more of the nodule on Williams through 10 weeks, while it formed 29% or less of the nodules on P1 # 671. In the delayed inoculation treatments a maximum of 14% of the nodules on Williams were formed by CB 1809, whereas on P1 # 671 a ratio of 89% or more were colonized by the same strain. The marked influence of the host on competition and affinity to nodulate with certain strain is demonstrated in this study. | ||
| Keywords | ||
| Soybean; Time course; Host`s mechanism; Competition. The first | ||
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