Skip to main content

Table 3 Competitiveness of antibiotically-marked strains compared to their unmarked parents.

From: Assessing the suitability of antibiotic resistance markers and the indirect ELISA technique for studying the competitive ability of selected Cyclopia Vent. rhizobia under glasshouse and field conditions in South Africa

Treatment Number of isolates tested Number able to grow on YMA + antibiotics % nodule occupancy by marked strain Competitive ability of marked strain
UCT40a + UCT40aMkd1 40 30 75.0 * I
UCT40a + UCT40aMkd2 28 14 50.0 U
UCT44b + UCT44bMkd1 18 4 22.2 * R
UCT44b + UCT44bMkd2 38 12 31.6 * R
UCT44b + UCT44bMkd3 26 10 38.5 U
UCT61a + UCT61aMkd1 50 0 0.0 * R
UCT61a + UCT61aMkd2 52 0 0.0 * R
UCT61a + UCT61aMkd3 60 0 0.0 * R
PPRICI3 + PPRICI3Mkd1 35 21 60.0 U
PPRICI3 + PPRICI3Mkd2 31 19 61.2 U
PPRICI3 + PPRICI3Mkd3 31 10 32.3 U
  1. * Denotes significant deviation from the expected frequency of 50% nodule occupancy using a χ2 test on pooled data, P < 0.05. Symbols indicate I = increased, U = unchanged and R = reduced competitive ability of the marked strain compared to its unmarked parent.