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Nodule development in wild type cv Torsdag (WT) and SL-deficient ccd8-2 plants infected with lacZ-labeled R. leguminosarum bv viciae treated with synthetic SL (+)-GR24 or solvent control. A, Number of infection threads per cm of root. B, Total number of nodules per cm of root. Values are means ± se (one to two root segments from n = 12–13 plants), and values with different letters are significantly different (P < 0.05).
