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Rafael Silva Ramos dos Anjos, Nerison Luís Poersch, Lorena Guimarães Batista, Lisandra Magna Moura, José Eustáquio de Souza Carneiro, Luiz Antônio dos Santos Dias and Pedro Crescêncio Souza Carneiro

Abstract: Studies highlight the hypocotyl diameter (HD) as an effective indicator of plant architecture (PA). Here, we estimated the genetic gain based on HD to improve PA. Twenty populations of cycles zero (C0) and one (C1), both in the F4 generation, were evaluated for PA, grain yield (GY) and HD. Plants with thickest HD in C0 were intercrossed in a circulant diallel mating design. In cycle C1, an estimated genetic gain of 4.93% was achieved for PA and 4.95% for HD. The populations with the highest probability of breeding lines with a thicker HD belong to cycle C1, and this selection strategy did not alter the GY of the populations of this cycle. Thus, indirect selection based on HD is promising for breeding for common bean PA by recurrent mass selection.

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