Desempenho de híbridos de cajueiro-anão-precoce no litoral do estado do Ceará

Vale, Egnesio Holanda; Hawerroth, Maraisa Crestani; Cavalcanti, J. J. V.; Neto, Francisco das Chagas Vidal; Melo, D. S.

doi:10.1590/0100-2945-403/13

Cited by 8 publications

(10 citation statements)

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“…Sardinha et al (1998), with the aim of selecting superior genotypes and expanding the cashew germplasm collection in Guinea-Bissau, selected 42 trees, taking a sample of 20 nuts from each tree, to evaluate the following physical characteristics: length, width, greatest thickness, and smallest thickness. Vale et al (2014) estimated genetic parameters and potential production performance in seven fullsib progeny originating from dwarf cashew crosses. Among other characteristics, these authors evaluated the production (kg ha -1 ) and mean nut weight (g), estimated from a sample of 20 nuts per progeny; and nuts in a same sample were weighed together.…”

Section: Introductionmentioning

confidence: 99%

Sampling of cashew nuts as an aid to research for the genetic improvement of cashew tree

Rossetti

Neto

Barros

2019

Pesq. agropec. bras.

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The objective of this work was to estimate sample sizes of cashew (Anacardium occidentale) nuts as an aid to the genetic improvement of cashew tree. Nuts were separated by size: nuts < 17 mm were classified as size 1 (S1); 17 mm ≤ nuts < 19 mm, size 2 (S2); 19 mm ≤ nuts < 23 mm, size 3 (S3); 23 mm ≤ nuts < 25 mm, size 4 (S4); and nuts ≥ 25 mm, size 5 (S5). Sizing the sample for each stratum depends on the variance of nut size and on the error level B allowed for either the estimates or the desired precision in the results. The sample size will be larger the greater the variance of the stratum, the lower the error level allowed for the estimates, or the greater the precision desired in the results. For an error B = 0.2 g, the sample sizes of the S5, S4, and S3 strata were n 5 = 42 nuts, n 4 = 30 nuts, and n 3 = 19 nuts, respectively. In the S5 and S4 strata, with better nut classifications, the average weight was 12.71 and 9.76 g, respectively. The Sm stratum -formed by the mixture of nuts of several sizes -should not be used as a parameter in this context due to its great variability, which is far larger than that of the other strata. Stratified sampling composed of six strata (S1, S2, ..., S5, Sm) is effective for estimating different sizes of nut samples.Index terms: Anacardium occidentale, sample size, sampling precision, uniform stratified random sampling. Amostragem de castanha-de-caju como suporte às pesquisas de melhoramento genético do cajueiroResumo -O objetivo deste trabalho foi estimar tamanhos de amostras de castanhade-caju (Anacardium occidentale) como suporte às atividades de melhoramento genético do cajueiro. As castanhas foram separadas por tamanho: castanhas < 17 mm foram classificadas como tamanho 1 (S1); 17 ≤ castanhas < 19 mm, tamanho 2 (S2); 19 ≤ castanhas < 23 mm, tamanho 3 (S3); 23 ≤ castanhas < 25 mm, tamanho 4 (S4); e castanhas ≥ 25 mm, tamanho 5 (S5). O dimensionamento da amostra de cada estrato depende da variância do tamanho da castanha e do nível de erro B admitido para as estimativas ou para a precisão desejada nos resultados. O tamanho da amostra será maior quanto maior for a variância do estrato, menor o nível de erro admitido nas estimativas, ou maior a precisão desejada nos resultados. Para um erro B = 0,2 g, os tamanhos de amostra dos estratos S5, S4 e S3 foram n 5 = 42 castanhas, n 4 = 30 castanhas e n 3 = 19 castanhas, respectivamente. Nos estratos S5 e S4, com melhor classificação de castanhas, as massas médias foram, respectivamente, 12,71 e 9,76 g. O estrato Sm -formado pela mistura de castanhas de diversos tamanhos -não deve ser utilizado como parâmetro nesse contexto, em razão de sua grande variabilidade, que é muito maior do que as dos demais estratos. A amostragem estratificada, composta por seis estratos (S1, S2, ..., S5, Sm), é eficaz para estimar amostras de castanhas de diferentes tamanhos.Termos para indexação: Anacardium occidentale, tamanho de amostra, precisão de amostragem, amostragem aleatória estratificada uniforme.A.G. Rossetti et al.

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Section: Introductionmentioning

confidence: 99%

Sampling of cashew nuts as an aid to research for the genetic improvement of cashew tree

Rossetti

Neto

Barros

2019

Pesq. agropec. bras.

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“…In the evaluation of Vale et al (2014), nut weight was correlated with nut yield (genetic correlation=0.55), proving to be an important component in the definition of the yield potential of the evaluated cashew hybrids. In the present study, the hybrids CCP76 x HAC276/1_5 (2,010.56 kg ha -1 ), CCP76 x HAC222/4_1 (1,842.88 kg ha -1 ), CCP76 x Embrapa51_6 (1,744.43 kg ha -1 ), CCP76 x Embrapa51_7 (2,502.93 kg ha -1 ), and CCP76 Table 6.…”

Section: Resultsmentioning

confidence: 98%

“…In general, the performed crosses effectively amplified the genetic variability, since the 77 genotypes were allocated in 21 different groups. This performance was expected due to the peculiar reproductive characteristic of Anacardium (Asolkar et al, 2011), and the potential genetic gains by breeding, in view of the significant phenotypic variability in both parents and hybrids (Vale et al, 2014;Hawerroth et al, 2017).…”

Section: Resultsmentioning

confidence: 99%

“…This variability was observed in the field, since the hybrids differed widely for fruit characteristics (color, size, flavor, etc. ), phenology, plant architecture (Vale et al, 2014), disease susceptibility (Hawerroth et al, 2017), and for other traits of interest (Tables 4 and 5).…”

Section: Resultsmentioning

confidence: 99%

“…BGC 589 transmits genes of lower nut weight to the progeny. Nut weight is fundamental in cashew breeding, as a target of indirect selection with a view to genetic gains in kernel weight, a product of great economic importance in cashew cultivation (Vale et al, 2014). Although not warranting superior segregating populations, it is very important that the parents of the hybridizations have a high-perse performance for the traits of interest, to raise the likelihood of more frequent favorable recombinants and transgressive plants (Carvalho et al, 2008).…”

Section: Resultsmentioning

confidence: 99%

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Genetic variability among cashew hybrids and prediction of superior combinations based on agronomic performance

Hawerroth

Bordallo

Oliveira

et al. 2019

Pesq. agropec. bras.

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The objective of this work was to evaluate the use of RAPD and ISSR molecular markers to determine the genetic variability among cashew (Anacardium spp.) genotypes, and to indicate possible promising crosses based on cashew genetic variability and phenotypic performance. Ten hybrids - derived from the crosses CCP 76 x BGC 589, CCP 76 x BRS 226, CCP 76 x HAC 276-1, CCP 76 x Embrapa 51, CCP 76 x BRS 253, CCP 76 x HAC222-4, and BRS226 x Embrapa 51 - and their parents were assessed at the molecular level. The hybrids were evaluated for nut yield, mean nut weight, bored nuts, and powdery mildew on nuts (scale 0-4). The RAPD and ISSR markers were efficient in the determinaton of the genetic variability among cashew genotypes, allowing of the grouping of 21 clusters. Associated with the phenotypic characterization of cashew nut for yield, weight, and health, the used markers can efficiently identify possible combinations with higher genetic variability and higher probability of developing transgressive genotypes in segregating populations.

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Genetic parameters and selection indexes in F2 and F2:3 soybean populations

et al. 2021

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The evaluation of genetic parameters in early generations select individuals in F2 and F2:3 and advancing only progenies with the potential to generate pure productive lines. The objectives of this study were to estimate genetic and phenotypic parameters in F2 and F2:3 populations derived from UFUS 7415 and TMG 7161 RR, evaluate different genotype selection strategies, and select progenies to improve agronomic traits. Populations in the F2 and F2:3 generations derived from a biparental cross between the parents UFUS 7415 and TMG 7161 RR were evaluated. The genetic parameters of 360 individuals in the F2 generation and 150 genotypes of each parent were evaluated. Heritability varied from 4.66% for the number of seeds per pod to 86.06% for plant height at flowering. The greatest selection gain was obtained for plant height at flowering (29.68%), related to grain production. In the F2:3 generation, 145 genotypes were evaluated and their parents, in a randomized block design with two replications. The correlations between characters and the genetic gains obtained by direct and indirect selection and based on the genotype–ideotype distance index and the Mulamba and Mock index of the sum of “ranks” were evaluated. With direct selection, selection gains ranged from –5.34 to 16.19%. The genotype–ideotype distance index showed a total selection gain of 40.49%, while the Mulamba and Mock index of the sum of ranks obtained a total gain of 39.35%. Twenty‐three genotypes were selected for the characters evaluated with both indexes in the F3 generation.

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Desempenho de híbridos de cajueiro-anão-precoce no litoral do estado do Ceará

Cited by 8 publications

References 8 publications

Sampling of cashew nuts as an aid to research for the genetic improvement of cashew tree

Sampling of cashew nuts as an aid to research for the genetic improvement of cashew tree

Genetic variability among cashew hybrids and prediction of superior combinations based on agronomic performance

Genetic parameters and selection indexes in F2 and F2:3 soybean populations

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