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Sugarcane (Saccharum spp.) is a crop of major economic significance but has complex genome structure. Here, the authors generate a BAC-based monoploid sugarcane reference sequence.

Salad crops: Longer-lasting lettuce Genetic studies have shown that the rate of deterioration of cut lettuce leaves in pre-packaged salads is a highly heritable trait, governed by gene regions that could be used to breed longer-lasting varieties. Many genetic studies have aimed at breeding better varieties of lettuce (Lactuca sativa), but most have focused upon those grown for whole heads, rather than the cut leaves that are becoming increasingly popular with consumers. An international team led by Ivan Simko, of the USDA in Salinas, California, have developed a genetic assay to distinguish fast- from slow-deteriorating lettuce varieties based on a single DNA region identified in a previous study. Their marker-based test may be useful in developing lettuces that show both disease resistance during cultivation, and a longer shelf life once leaves are cut for sale.