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ÎÄÏ×ÔÎÄ£º Host specialization could have been by selection of biovars (different symbiotic specificities a single bacterial lineage may harbor) (Bena et al., 2005). The discovery of two new biovars of S. meliloti, one capable of efficiently nodulating Medicago laciniata (Villegas et al., 2006) and the other Phaseolus (Mnasri et al., 2007), suggests that it is the biovars and not the chromosomal lineages that coevolve with hosts,but further research is needed to support this proposal. ÇëÎÊbiovarsÊÇʲôÒâ˼£¿ biovars ºÍ chromosomal lineages ÓÐÊ²Ã´Çø±ðÄØ£¿ [ Last edited by wangdandelia on 2011-3-3 at 21:09 ] |
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