Rhizomatous birdsfoot trefoil exhibits a unique response to nitrogen-free conditions

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Agron J | / 5卷 / 709-713期
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New genotypes of birdsfoot trefoil (Lotus corniculatus L.) from Morocco exhibit rhizomes, but little is known about their N2-fixation characteristics. Our objective was to evaluate the N2-fixation capacity of rhizomatous birdsfoot trefoil infected by native rhizobia or by strains used in commercial inoculants. An additional objective was to assess the N2-fixing potential of two Moroccan isolates, R.L. 5797 and R.L. 5758, on commercial cultivars of birdsfoot trefoil. Seedlings of `Norcen', `AU Dewey', and a Moroccan rhizomatous entry, designated `RBRC', were individually inoculated with commercial strains BFT027, BFT028, BFT030, 1710-2, CB756, or strains R.L. 5797 or R.L. 5758. Control treatments were noninoculated seedlings with or without supplemental N. Surprisingly, the seedling mass of RBRC was equal (Pgt;0.05) for all treatments. Norcen exhibited its greatest seedling mass when inoculated with strain BFT027; AU Dewey, with strain R.L. 5797. The rhizomatous RBRC did not show specificity for native Moroccan isolates of rhizobia, but these isolates effectively nodulated the commercial cultivars of birdsfoot trefoil.
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