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• W2034310259 abstract "Burr medic (Medicago polymorpha L.) is an annual pasture legume that is widely distributed in southern Australian farming systems. Burr medic is nodulated by rhizobia (Sinorhizobium meliloti and Sinorhizobium medicae) that reside in many Australian soils, but the symbioses that develop are often sub-optimal in their rate of N2 fixation. We attempted to identify burr medic lines, which are able to form effective symbioses with the naturalised Sinorhizobium in Australian field soils, as potential parents for a breeding program. There were three glasshouse experiments. Initially, 222 lines (including the M. polymorpha cvv. Santiago, Serena and Circle Valley) were inoculated with extracts of two soils that had been collected near Waikerie (soil S109) and Lochiel (soil S142) in South Australia. These soils were used because they contained numerically large communities of naturalised Sinorhizobium spp. that produced sub-optimal rates of N2 fixation with cv. Santiago. None of the 222 lines of burr medic were able to form an effective symbiosis with the rhizobia from soil S109. However, when nodulated by the rhizobia from soil S142, some lines (e.g. SA8194) formed a very effective symbiosis, producing up to double the shoot dry matter (DM) of Santiago and eight times the DM of uninoculated plants. Seven promising lines were selected for further testing (with extracts of nine soils). Subsequently, two lines (SA20056 and SA8194) were selected and their symbiotic performance compared with that of Santiago, using extracts from 28 soils. While soil treatment had a major effect on mean shoot DM (soil N103=120 mg, soil N105=17 mg), the three medic lines performed similarly. Santiago, SA20056 and SA8914 all formed ineffective symbioses with the rhizobia in at least half of the 28 soils, even though >95% of the plants were nodulated. These experiments confirm that ineffective symbioses are common between burr medics and the rhizobia that have become naturalised in many Australian soils. Although some lines of burr medic were identified that were able to form more effective symbioses with the rhizobia in individual soils, none were able to form effective symbioses with a wide range of soil rhizobia. If a plant breeding approach is to be used to improve symbiotic performance of burr medic we propose that its hybridisation with other medic species, that have less specific rhizobial needs, will be required." @default.
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• W2034310259 date "2004-08-01" @default.
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• W2034310259 title "Burr medic (Medicago polymorpha L.) selections for improved N2 fixation with naturalised soil rhizobia" @default.
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• W2034310259 doi "https://doi.org/10.1016/j.soilbio.2004.04.014" @default.
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