Genetic divergence of sub samples of tomato germplasm bank the vegetables of the UFV / Divergência genética entre subamostras de tomateiro do banco de germoplasma de hortaliças da UFV

AUTOR(ES)
DATA DE PUBLICAÇÃO

2009

RESUMO

It is up to the enhancers that use the sub-samples that is of the Germplasm Bank to make available genetic resources for the programs of enhancements, given that for the success of any pre-program of enhancement it is necessary to have the knowledge of the amount of existing variation of the specie being analyzed. The genetic resources of the Germplasm Bank of Vegetables of the Federal University of Viçosa (BGH-UFV) represent more than 40 years of collected data. Therefore, it is necessary to make a characterization and evaluation of these accesses, considering that generally these are landraces from different regions of the country and of the world. This work had the objective of assessing sub-samples from the same commercial group of tomato of the Germplasm Bank of Vegetables of the Federal University of Viçosa (BGH-UFV). Initially, 101 sub-samples from the Salada group and 28 tomatoes sub-samples from the Santa Cruz group and the Fanny, Débora and Santa Clara commercial cultivars were selected for analysis. An analysis of the joint variation was performed, identifying the characteristics with interaction between significant testimonies and tests, and the type of existing interaction was analyzed. After that, the diagnostic of multicollinearity was performed and, through the Singh method (1981), the relative importance of each characteristic for the genetic diversity as well. The Garcia methodology (1998) was used to discard the characteristics of lower importance. In the multifarious analysis, the generalized distance of Mahalanobis was used as measure for dissimilarity. And to form the groups, the hierarchical cluster method of average non-standard connection (UPGMA) and the Tocher optimization procedure were used. There was interaction of the complex type for total soluble solids (TSS) in the Salada group and thickness of the main stem (TMS) and total acidity (TA) in the Santa Cruz group. In the multicollinearity diagnostic for the Salada group the characteristics “number of good fruits” (NGF), “thickness of the endocarp” (TE) and “mass of good fruits” (MGF) needed to be eliminated. Just as NFG, TE and MGF were eliminated, so were eliminated from the Santa Cruz group width of the fruit (WF), mass of bad fruits (MBF), width of the scar of the pedicel (WSP), width of the axis (WA), width of the leaf (WL), total number of fruits (TNF), length of the fruit (LF), number of locules (NL), width of the mesocarp (WM) e sensorial quality (QO). Through the Garcia Methodology, the characteristics number of bad fruits, diameter of the internode (DI), length of the internode (LI), total acidity (TA), width of the leaf (WL) and width of the stem (WS) were eliminated in the Salada group, while in the Santa Cruz group no characteristic was eliminated. There was a similarity between the Toucher’s grouping and the dendogram generated by the average connection between groups (UPGMA) concerning the number of groups formed when the cut in the dendogram is made between 38 – 35% and 37 – 52% of dissimilarity for the Salada group and the Santa Cruz group respectively. The sup-samples BGH-2273 and BGH-2247 of the Salada group and the Santa Cruz group respectively were the most diverging ones amongst all the sub-samples assessed.

ASSUNTO(S)

melhoramento vegetal lycopersicon esculentun mill genetic resources lycopersicon esculentun mill recursos genéticos

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