Selection in early generations and the occurrence of heterosis for the character root distribution

Toaldo, Diego; Morais, Pedro Patric Pinho; Battilana, Jaqueline; Guidolin, Altamir Frederico

doi:10.1007/s10681-012-0746-5

Cited by 10 publications

(10 citation statements)

References 17 publications

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“…However, breeding programs have exhaustively targeted the selection LUIS P.S. VELHO et al of genotypes only considering the traits of the aerial part of the plant, while little attention has been paid to the study on root distribution, especially under field conditions (Miguel et al 2013, Toaldo et al 2013, de Melo et al 2016.…”

Section: Introductionmentioning

confidence: 99%

Root distribution and its association with bean growth habit

Velho

Melo

Bernardy

et al. 2018

An. Acad. Bras. Ciênc.

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Associations between root distribution and bean growth habit may contribute to the selection of genotypes adapted to restrictive environments. The present work aimed to relate and compare root distribution with the growth habit in beans. 10 bean genotypes of different growth habits (I, II and III) were evaluated for root distribution in two agricultural years (2014/15 and 2015/16). The genotypes responded similarly for the trait root distribution throughout the agricultural years, without any simple effect of the genotype x year interaction. The factors genotype and years were significant for the trait. The genotypes of a determinate habit showed significant differences compared to other genotypes (II and III), which were ascribed to their poor performance in the average of years. They include the Carioca Precoce, which showed a behavior similar to the other habits. It could be considered a "plastic" genotype under restrictive conditions. The contrasts revealed significant differences between the growth habits II vs I (2.87) and III vs I (3.64) for root distribution. The differences were also significant for grain yield. Thus, genotypes of indeterminate growth habit show greater root distribution than those of a determinate habit, regardless of the agricultural years. Therefore, they are promising for use in blocks of crosses, when the purpose is the selection of cultivars adapted to low input environments.

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Section: Introductionmentioning

confidence: 99%

Root distribution and its association with bean growth habit

Velho

Melo

Bernardy

et al. 2018

An. Acad. Bras. Ciênc.

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“…In other words, the homozygous condition of the genes is restored due to the natural process of Throughout the segregating generations, increased loci in homozygosis or decreased frequency of heterozygous genotypes naturally led to increased endogamy, which was rapidly achieved through self-pollination and distribution of genetic variance (Fehr 1987). Previous studies conducted by Toaldo et al (2013) and De Melo et al (2016) found that the F 2 and F 3 hybrid populations showed hybrid vigor or heterosis, compared to their parents. However, due to the lack of economically feasible alternatives to obtain commercial hybrids in beans (Ramalho et al 1993), the breeding program must advance the segregating generations to obtain a fixed population.…”

Section: Resultsmentioning

confidence: 86%

“…On the other hand, BAF09_BAF07 F 6 came from parents of the black commercial group. Crosses involving highly divergent genetic constitutions (with contrasting alleles in the same locus) result in progenies with higher proportion of heterozygous loci -thus becoming the dominance variance component (Toaldo et al 2013).…”

Section: Resultsmentioning

confidence: 99%

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Inheritance of root distribution in common bean and selection strategy

Melo

Trevisani

Corrêa

et al. 2018

Crop Breed. Appl. Biotechnol.

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The objective was to determine the predominant genetic inheritance in the trait root distribution in common bean and define the selection strategy. An experiment involving 40 genetic constitutions (segregating and fixed populations), was developed during the agricultural years 2014/15 and 2015/16. The experiment was arranged in a Federer's augmented block design with 3 replicates. The root distribution was evaluated by Bohm method. Estimates of mean contrasts between the F 4 progenies and their parents did not reveal any significant differences in any comparison. The generations F 5 and F 6 presented the same behavior. The distribution of the component of the additive genetic variance was similarly conducted for the segregating generations. Thus, since the predominant inheritance of the root distribution is additive, the selection of this trait is recommended to be performed at the end of the breeding program.

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“…Esse caráter é altamente responsivo à disponibilidade de nutrientes e sua distribuição no solo (LINKOHR et al, 2002). Estudos demonstram que a extensão e natureza da variação genética do sistema radicular possuem grande implicação na obtenção e absorção de água e nutrientes para o aumento de produtividade sob estresse hídrico ou baixa fertilidade do solo (TOALDO et al, 2013). Assim, o crescimento espacial do sistema radicular determina a habilidade da planta em explorar recursos que estão mal distribuídos.…”

Section: Melhoramento Com Foco Em Eficiência No Uso De Nitrogêniounclassified

Associação genômica ampla para caracteres relacionados à eficiência no uso de nitrogênio em linhagens de milho tropical

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Selection in early generations and the occurrence of heterosis for the character root distribution

Cited by 10 publications

References 17 publications

Root distribution and its association with bean growth habit

Root distribution and its association with bean growth habit

Inheritance of root distribution in common bean and selection strategy

Associação genômica ampla para caracteres relacionados à eficiência no uso de nitrogênio em linhagens de milho tropical

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