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Daniel Lucas Magalhães Machado, Gabriel Mascarenhas Maciel, José Magno Queiroz Luz, Joelson André de Freitas, Ana Paula Oliveira Nogueira and Roberta Camargos de Oliveira

ARTICLE – Reduced inbreeding depression in separate generations of onions

Abstract: Mitigating reductions in vigor in onion seed production has been a
great challenge to breeding programs. Therefore, we compared the effects of
inbreeding depression among populations obtained from self-fertilization and
crossbreeding with two and three plants. We evaluated eleven populations and
three breeding methods (two and three-plant crossbreeding, and self-fertilization
of one plant) and measured the characteristics related to seed yield (plant
appearance, stem vigor, number of umbels, flowering uniformity, fruit setting,
and resistance to Alternaria) from 2014 to 2015. Thirteen RAPD molecular markers
were used to determine the genetic divergence among populations derived
from different breeding methods. We found that inbreeding depression affects
plant vigor in early generations that have greater heterozygosity. Three-plant
crossbreeding results in greater seed yield in populations with low levels of
inbreeding. The populations obtained from self-fertilization and two- and threeplant
crossbreeding were genetically similar, demonstrating the efficiency of
obtaining inbred lines without genetic divergence.

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