Figure 1From: Association mapping and marker-assisted selection of the lettuce dieback resistance gene Tvr1Dieback symptoms on different types of lettuce: A - stem type, B - leaf type, C - green romaine, and D - red romaine. Plants on the left are healthy, while plants on the right show typical symptoms of dieback, such as stunted growth, yellowing of older leaves, and gradual dying. Photographs were taken eight weeks after planting.Back to article page