Researchers from the US and France used comparative genomics to begin defining the core and accessory genomes of nitrogen-fixing root nodule bacteria from a genus called Sinorhizobium. The team started by sequencing and assembling draft genomes for four dozen strains representing five so-called genospecies: S. meliloti, S. medicae, S. fredii, S. saheli, and S. terangae.

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Technology Review reports that researchers in the US have used CRISPR to modify a number of human embryos.

By introducing genes from butterfly peas and Canterbury bells, researchers in Japan have developed a blue chrysanthemum, according to NPR.

Plant researchers plan to sequence some 10,000 samples that represent the major plant clades, ScienceInsider reports.

In Nature this week: a Danish reference genome, and more.