Capacidade de combinação de genitores de cenoura para caracteres de produtividade de raízes e tolerância à queima-das-folhas

Carvalho, Agnaldo Donizette Ferreira de; Silva, Giovani Olegário da; Pereira, R. B.

doi:10.1590/0034-737x201663020009

Cited by 4 publications

(4 citation statements)

References 10 publications

(16 reference statements)

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“…The high and negative correlation (-0.77) between MRM and tolerance to leaf blight was demonstrated by Brito et al (1997). These results agree with those presented by Pereira et al (2012) and Carvalho et al (2016), who found a negative correlation between the MRM (-0.52 and -0.31) and TRM (-0.59 and -0.47) of populations 561 and 586 with the leaf blight severity. The fact that the MRM is correlated with ADPC makes sense, since plants were more tolerant to leaf blight and kept their leaves for longer, thereby enabling conditions for the development of the roots until they reach a marketable standard.…”

Section: Resultssupporting

confidence: 93%

Response to Direct and Correlated Selection on Yield and Leaf Blight in Carrots

Carvalho

Silva

2020

BJA

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Section: Resultssupporting

confidence: 93%

Response to Direct and Correlated Selection on Yield and Leaf Blight in Carrots

Carvalho

Silva

2020

BJA

Self Cite

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“…Currently, carrot breeding programs aim to develop mainly hybrid cultivars. Although market has focused on this type of cultivar; multi-character selection in breeding base populations is an important phase in breeding programs (Carvalho et al, 2016).…”

Section: Scientific Communicationmentioning

confidence: 99%

Direct selection for phenotypic traits in carrot genotypes

2019

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Selection of more productive carrot genotypes is fundamental for crop breeding programs aiming to increase productivity and reduce cost production. Thus, the aim of this work was to evaluate gains from direct selection and to measure its effects on other agronomic traits of interest in carrots. Thirty six carrot genotypes were evaluated in two experiments: the first, sown in the second half of November 2016 and the second one in the first week of March 2017. The experimental plots covered a useful area of 1.5 m2, in transversal rows and 0.10-m double spacing between single rows x 0.20-m between double rows in a randomized block design with 3 replicates. At 90 days, the incidence of leaf blight was evaluated using a note scale and 100 days after sowing, roots were harvested measuring the number and mass of total, commercial and non-commercial roots of each plot. The direct selection of commercial root mass allowed to estimate indirect and expressive gains for most evaluated traits, allowing to select seven genotypes (populations 758, 751, 737, 736, 735, 744 and 742) which can be released as cultivar or for the formation of a broader genetic-based population.

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“…The carrot breeding collection of the Embrapa genetic breeding program includes variability that can be exploited when releaseding new free-pollinated cultivars or lines for obtaining hybrids. Carrot breeding programs generally prioritise characteristics such as yield and root quality, in addition to resistance to disease (CARVALHO et al, 2016). However, simultaneous selection for these characteristics, with a view to adequate and balanced gains, is a challenge for breeding programs, since most are of quantitative inheritance and may even be correlated, implying the possibility of selection for a certain characteristic changing expression of the others.…”

Section: Introductionmentioning

confidence: 99%

“…A coleção de trabalho de cenoura do programa de melhoramento genético da Embrapa dispõe de uma variabilidade que pode ser explorada visando o lançamento de novas cultivares de polinização livre ou de linhagens para a obtenção de híbridos. Normalmente, em programas de melhoramento genético de cenoura as características priorizadas são: rendimento e qualidade de raiz, além da resistência a doenças (CARVALHO et al, 2016). Contudo, a seleção simultânea para essas características, visando ganhos adequados e equilibrados, é um desafio para os programas de melhoramento genético, em razão da maioria serem de herança quantitativa, podendo ainda estar correlacionadas, o que implica na possibilidade da seleção em determinada característica, alterar a expressão em outras.…”

Section: Introductionunclassified

Estimates of genetic gains in the carrot using different selection indices

Carvalho¹,

Pereira²,

Silva³

2022

AGRO@MBIENTE ON-LINE

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The carrot is one of the most important and preferred vegetables in Brazil due to its versatility and nutritional significance, especially as a source of vitamins. The selection of carrot genotypes should consider several agronomically important characteristics to allow more suitable and balanced gains. The aim of the present study was to estimate genetic gains in the carrot using different selection indices. Thirty-six carrot genotypes were evaluated in two experiments, the first conducted between 16 November 2017 and 1 March 2018, and the second between 5 March and 18 June 2018 in, Brasilia. In both trials. the experimental design was of randomised blocks with three replications. The plots were sown directly onto the seedbed, which had a total working area of 1.8 m2. The incidence of leaf blight was evaluated 78 to 98 days after sowing, at intervals of seven days, giving a total of four evaluations. The harvest was carried out at 105 days when the characteristics of the yield components were measured. An analysis of variance was applied, together with five selection indices: direct selection, classic, desired gain, weight- and parameter-free, and genotype-ideotype. There were differences between genotypes for most of the characteristics under evaluation. The genotype-ideotype index afforded the greatest gains for the characteristics being evaluated, with an economic weight equal to the coefficients of genetic variation; however other indices were also efficient and offered balanced gains, with the exception of the desired-gain index.

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Capacidade de combinação de genitores de cenoura para caracteres de produtividade de raízes e tolerância à queima-das-folhas

Cited by 4 publications

References 10 publications

Response to Direct and Correlated Selection on Yield and Leaf Blight in Carrots

Response to Direct and Correlated Selection on Yield and Leaf Blight in Carrots

Direct selection for phenotypic traits in carrot genotypes

Estimates of genetic gains in the carrot using different selection indices

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