Selection of promising materials for sweet potato crosses from a germplasm bank
Palabras clave:
Ipomea potatoes, Genetic variability, Selection, Plant BreedingResumen
The success of a breeding program is based on the existence of genetic variability of populations. Epagri's sweet potato germplasm bank began in 1985 with several collections throughout the state of Santa Catarina. later some introductions of Peru, Embrapa and a collection with several accesses of the research unit of Epagri of Caçador were made. From 2001 to 2003, crosses were made between the existing accessions generating several new genotypes. In this way the sweet potato BAG has already registered more than 700 hits, but currently, due to the losses, the number is reduced to 128. The objective of this work was to select promising materials from the germplasm bank for future crosses taking as main parameters the commercial productivity. The experiment was carried out in a randomized block design totaling 128 treatments (accessions) with three replications and seven plants per plot, and only the five central plants were evaluated, the population was 30000 plants per hectare. the commercial productivity of roots was the variable studied and submitted to analysis of variance and the mean compared by the Scott Knott test at the level of 5% probability of error. the 128 accessions of the Epagri BAG were grouped into five groups by the Scott Knott test, among these groups only 1 with 40 accessions presented average commercial productivity below 17 tons per hectare, an average considered national. Thus, the remaining 88 accessions, which were divided into, 4 groups are promising, with averages ranging from 18 to 84.72 tons per hectare. However, when we talk about improvement and apply a selection differential, the group with the highest average commercial productivity that contained 6 accessions, all with an average of more than 70 tons per hectare, was the one selected to carry out the crossings. The accessions of the Epagri Sweet Potato Germplasm Bank showed promise for the selection of materials for sweet potato crosses and obtaining future genetic materials.
