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ARS Identifies Romaine Lettuce Varieties that Last Longer

Scientists with USDA’s Agricultural Research Service (ARS) have identified five Romaine lettuce varieties that both brown less quickly after fresh-cut processing and are slower to deteriorate postharvest. Considering browning and deterioration ratings together, the best breeding lines for commercial production, and also for use as parents to develop new varieties, are Darkland, Green Towers, Hearts Delight, Parris Island Cos, and SM13-R2. In addition, researchers found the chromosome region that contains the genes for slow deterioration also contains four genes and one DNA region that code for resistance to downy mildew.