Resumo

RAMIREZ, Ma. Elena et al. Distinctness, uniformity and stability by morphological characterization in amarath varieties. Rev. Mex. Cienc. Agríc [online]. 2010, vol.1, n.3, pp.335-349. ISSN 2007-0934.

This study was carried out in order to value procedures for the evaluation of the distinctness, uniformity and stability in plant varieties, so as to protect the obtainer's rights, and it was carried out in two spring-summer agricultural cycles in 2006 and 2007 in experimental fields at Colegio de Postgraduados en Ciencias Agrícolas. Ten amaranth varieties were used, five from Hungary and one from Mexico, all with the protection of the obtainer's rights, one variety from Brazil and another one from Mexico, to evaluate the distinction, considered as candidates. Morphological characterization was carried out according to the guide TG/247/1 for the varietal description in amaranth, composed of 40 characters, and of which Mexico is a member since 1997.The system of the National Inspection and Certification Seeds Service was used for the distinctness, uniformity and stability test; in this way eigth out of ten varieties complied with the distinction, although two (Roza and BRS-Alegría) do not, since they are morphologically similar. The varieties Maros and Eniko resulted the same, yet they show traits that distinguish them, the Maros variety shows pigmentation in the utricle in the grain-filling phase; also, 10% of infloresences show irregular red stains, known as variegation. On the other hand, 25 to 40% of plants show pigmentation on the base of the stem; as for uniformity, the varieties expressed the characteristics that define them in each environment. However, those that are quantitative, with an observation of the measurement of several plants or parts of individual plants, do not comply with the stability. Six characteristics were evaluated using a distinction interannual combined analysis, with the particularity that the grade given to the characteristics taken on the field does not correspond to the differentiation of a variety.

Palavras-chave : amaranth; distinction test; protection of varieties; uniformity and stability.

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