Abstract
When breeding diploid potatoes, tetraploid progeny can result from the union of 2n eggs and 2n pollen in 2x-2x crosses. Thirty-three crosses were made to examine tetraploid progeny frequency in 2x-2x crosses. All crosses were between S. tuberosum dihaploids and diploid self-compatible donors, M6 and DRH S6-10-4P17. Using chloroplast counting for ploidy determination, the frequency of tetraploid progeny was as high as 45% in one of the 33 crosses. Based upon single nucleotide polymorphism (SNP) genotyping, the tetraploid progeny were attributed to bilateral sexual polyploidization (BSP), which is caused by the union of 2n egg and 2n pollen. Dihaploids were identified that produce lower frequencies of 2n eggs. The results of this study suggest that S. tuberosum dihaploids with a high frequency of 2n eggs should be avoided in 2x - 2x crosses for diploid breeding programs.
Highlights
The Inner Niger Delta or DIN has been recognized as a Ramsar site since February 1, 2004
The specialized services of the State intensify the chemical treatment during the return of the evening when the birds have a great flight activity and are eager to group in their dormitories or nesting areas or in the morning of happiness when they leave
For foraging the bird's contact with the drops may be by sedimentation or by impact
Summary
The Inner Niger Delta or DIN has been recognized as a Ramsar site since February 1, 2004. It is so important for people practicing agriculture, fishing, and breeding as well as the animals that live there because of the diversity and the richness of its ecosystem. The primary sector (agriculture, livestock, fishing) is the primary source of economic growth and employs over 80% of the population. Some of which are residents, and others seasonal or migratory, have habitats very suitable for their feeding and reproduction. 1963 presented an inventory of DIN avifauna composed of several species including residents and migrants. The granivores present in the area constitute real dangers for cereal crops. The peasants tirelessly engage in the means of struggle against them
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