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In this chapter, we outline the significance of landraces of common bean (Phaseolus vulgaris L.) for unraveling novel morphological, biochemical and genetic variation that could be integrated to breeding programs, related to seed coat color and glossiness and disease resistance. Moreover, we emphasize how important the conservation of such genetic resources is in small-farming areas, the prevailing system for bean cultivation. A particular Brazilian landrace referred as Serro Azul by local farmers is highlighted to show new evidences of the genetic control of seed glossiness in common bean and how it implicates in the seed protection against diseases and insects. Moreover, new findings presented here give insights into a remarkable anthracnose resistance of one of the variants of Serro Azul, which also presents seed coat glossiness. The potential benefits for human health after consuming beans with glossy seed coat are also discussed. This is one among the various landraces that need better understanding for strengthening the knowledge of the genetic diversity of common bean. Such knowledge is important for conducting conservation actions and performing new crosses for providing genetic materials with desirable combinations for farmers, breeders and consumers.

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Genetic Variation of Landraces of Common Bean Varying for Seed Coat Glossiness and Disease Resistance: Valuable Resources for Conservation and Breeding