Diversidade genética e análise dialélica em trigo (Triticum aestivum (L.) Thell)
Nove genótipos de trigo (Anahuac, BH 1146, Trigo BR 10 - Formosa, Trigo BR 26 - São Gotardo, CEP 24 - industrial, EMBRAPA 15, EMBRAPA 16, EMBRAPA 21 e EMBRAPA 22), seus F 1 e recíprocos, constituindo um dialelo completo, foram plantados, em maio de 1995, no campo Experimental do Setor de Agronomia d...
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Universidade Federal de Viçosa
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|Citação:||ASSMANN, Isidoro Carlos. Diversidade genética e análise dialélica em trigo (Triticum aestivum (L.) Thell). 1997. 118 f. Tese (Doutorado em Genética e Melhoramento) - Universidade Federal de Viçosa, Viçosa. 1997.|
|Resumo inglês:||Nine genotypes of wheat (Anahuac, BH 1146, BR 10 – Formosa, Trigo BR 26 – São Gotardo, CEP 24 – Industrial, EMBRAPA 15, EMBRAPA 16, EMBRAPA 21 e EMBRAPA 22) their F 1 and reciprocals, constituting a complete diallel, were planted on May 1992, on the experimental field of the Agronomic Section of the UFV, Minas Gerais State, Brazil. The plots in the blocks were of 2 lines with 1.0 m, spaced at 0.30 m among lines and 0.10 m among plants. The characters evaluated were: cycle (from planting to hearing), plant height, and number of spikes by plant, number of sterile spikelets by spike and by plant, number of fertile spikelets by spike and by plant, number of grains by plant, by spike; and by spikelet, weight of grains by plant, and of a thousond grains, and productivity by hectere. The genetic diversity of the genotypes were evaluated by the Generalized Distance of Mahalanobis, and the genotypes Anahuac and Trigo BR 26 – São Gotardo presented the shortest distance and the genotypes BH 1146 and Trigo BR 26 – São Gotardo presented the greatest distance. According to the grouping analysis using the closest neighbor method and the Tocher method, it was possible to form four groups. The irrigated wheat genotypes (Anahuac, Trigo BR 10 – Formosa and BR 26 – São Gotardo) formed a group, while the irrigated wheat genotype (EMBRAPA 22) formed a single group. The genotypes with the higher plants (BH 1146 and CEP 24 – Industrial) formed another group and the genotypes of wheat of intermediary height (EMBRAPA 15, EMBRAPA 16 and EMBRAPA 21) formed the fourth and bot group. The graphic dispersion of the genotypes, as well as their distances, were presented according to Singh (1981) methodology. The plant hight explained more than 92% of the genetic variability of the parent plants. For the diallelic analyhsis, the methodologies of Griffing (1956) and Hayman (1954) were used. The general capacity effects of combination were greater than those of the specific capacity, and of the reciprocal, for the studied characters. The genotypes BH 1146, Trigo BR 26 – São Gotardo and EMBRAPA 22 presented the greatest positive effects of the general capacity of combination. For almost all of the studied characters, tha additive genetic effect was not the most important one, according to the methodology of Hayman (1954). The heritage of the studied characters showed to be oligogenic.|