Melhoramento de feijão: seleção precoce com base em caracteres de alta herdabilidade e interação genótipo x ambiente
The common bean (Phaseolus vulgaris, L.) is one of the most important legumes in Brazil and in the world. Improvement has been seeking for the bean crop, cultivars that meet the grain size required by the consumer. The standard grain size is between the sieves 12 and 13.The precocious selection in s...
| Autor principal: | Amaral, Erisson Lubacheski do |
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| Formato: | Trabalho de Conclusão de Curso (Graduação) |
| Idioma: | Português |
| Publicado em: |
Universidade Tecnológica Federal do Paraná
2020
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| Assuntos: | |
| Acesso em linha: |
http://repositorio.utfpr.edu.br/jspui/handle/1/14135 |
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| Resumo: |
The common bean (Phaseolus vulgaris, L.) is one of the most important legumes in Brazil and in the world. Improvement has been seeking for the bean crop, cultivars that meet the grain size required by the consumer. The standard grain size is between the sieves 12 and 13.The precocious selection in self-pollinated plants, usually happens in progenies obtained from F2 and F3 generations. The methodology will depend on the skills of the breeder, who aims for the selection of the best progenies. Grain size is a qualitative trait of high heritability, being important in the selection of superior genotypes in early generations. The objective of the research was to select segregating populations in early generations, based on traits of high heritability, analyzing the interaction in different test environments. The F3 populations were conducted in the municipalities of Pato Branco – PR and Clevelândia – PR in the 2016/2017 crop season.The IPR Tuiuiu and IAC Imperador cultivars were the parents. Yield components, relative production of sieve grains (PRGP) and sieve yield (RP%) were assessed. The adaptability, stability and average production analyses were performed using Selegen, model77, as the software. However, for analysis of individuals in F3 progenies, the model used was the 60. The positive correlation was observed between MMG and the grain size, being more significant in Pato Branco. Through grain size in sieve 14, plants with lbigger MMG and MGP were selected, but, the opposite is not valid. The heritability (h2a) as expected, was bigger for the qualitative traits. When there is high heritability and little influence of the environment, we can select plants with acceptable grain size in early F3 generations. When related to yield components, the progenies behaved in a different way in both sites. The NLP trait showed positive relation with the largest grain sizes for the genotypes 297,170 e 102. The largest grain size had positive relation with a bigger NGL. Considering lines F3, the biggest reliability would be in selecting the most stable progenies in both environments, and relating the same ones with the traits of high heritability. That said, the best progenies for generation improvement would be: 289, 297, 21, 114, 273, 179, 136, 180, 116, 101, 57, 203, 177, 159, 210, 70, 300, 149, 150, 257, 170, 76, 72, 71, 131, 87, 75, 231, 88 e 102. |
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