Abstract
SM09A and SM09B are F8 romaine breeding lines of lettuce resistant to the dieback disease (caused by Tomato bushy stunt virus and Lettuce necrotic stunt virus) and with good shelf life. SM09B was selected from a cross between 'Darkland' and PI 491224, whereas SM09A was developed from 'Green Towers' × ('Darkland' × PI 491224). Resistance to the disease in both breeding lines is derived from PI 491224, a primitive romain-type lettuce that is highly perishable when processed for salad. In replicated field trials, the 2 breeding lines showed complete resistance to dieback. Field observations (in California, USA) were confirmed through the analysis of molecular markers closely linked to the dieback resistance gene Tvr1. Testing of salad-cut lettuce in modified atmosphere packaging indicated slower decay in the 2 breeding lines compared with other dieback-resistant romaines. Morphological and horticultural characteristics of the 2 breeding lines are given.
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