Marker-assisted breeding is a technique that uses genetic markers linked to desirable traits to guide selection in breeding programs, rather than waiting to observe the traits directly. This approach accelerates the development of improved plant varieties by allowing breeders to identify favorable genetics at the seedling stage, reducing the time and resources needed across breeding cycles. It has become a powerful tool for incorporating traits like disease resistance, drought tolerance, and improved yield into crop and horticultural plants.
Scientists identified and narrowed down four genetic regions in apple trees that help them resist apple scab, a destructive fungal disease, and found the specific genes likely responsible — opening the door to breeding disease-resistant apples without heavy pesticide use.
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Four of five candidate resistance regions (QTLs) were validated in a population of 1,970 apple trees, with one region (qF3) failing to confirm
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43 newly developed genetic markers substantially narrowed the location of each resistance region, making them far more useful for breeding programs
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Candidate genes identified include receptor-like proteins and RNAi-related genes, suggesting apple trees use multiple, complementary defense strategies against the fungus
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