Seleção de descritores morfoagronômicos e potencial genético de linhagens de tomate de crescimento determinado
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2019-02-28
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Universidade Federal de Goiás
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The tomato comes from South America, more specifically from the Andean region, its domestication happened first in Mexico and later in Europe. This process of domestication brought the loss of genetic variability and the narrowing of the genetic basis of the cultivated tomato. Germplasm banks consist of a conservation method that provides food security. The studies with morphological descriptors provide the knowledge of the variability of accesses and allow a better management of germplasm banks, favoring the identification of suitable parents for population formation through plant breeding. The present study had as objective to suggest minimum morphoagronomic descriptors with measurable characteristics evaluated from the growth tomato lines determined from the breeding program of Vivati Plant Breeding. The experimental design was composed of 85 complete block lines with three replications. The experiment consisted of three blocks, eighty five plots (each plot corresponding to a different lineage) and twelve plots per plot. The two central plants of each plot were analyzed. The evaluations were carried out through the germplasm bank of Vivati plant breending, using adapted morphological descriptors described in the guidelines for the implementation of the MAPA distinguishing, homogeneity and stability (DHS) assays. Of the 39 suggested morphoagronomic descriptors, 43.6% of the descriptors were discarded, a fact that does not cause loss of information, reduces costs and dynamizes management of germplasm classification. The PXT-601 and PXT-610 strains were distinguished as superior genotypes by direct selection methods and selection indexes and may possibly be recommended for continuity in the company groundwater improvement program of Vivati Plant Breeding.
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NASCIMENTO, M. V. Seleção de descritores morfoagronômicos e potencial genético de linhagens de tomate de crescimento determinado. 2019. 84 f. Dissertação (Mestrado em Agronomia) - Universidade Federal de Goiás, Goiânia, 2019.