Breeding Plans

Hallauer, Arnel R.; Filho, J. B. Miranda; Carena, M. J.

doi:10.1007/978-1-4419-0766-0_12

Cited by 151 publications

(68 citation statements)

References 70 publications

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“…It was observed that all hybrids of this group have line P8 as common parent. In this case, the good performance of these hybrids for PE can be explained by the additive action of genes originating from parent P8 (Hallauer et al, 2010).…”

Section: Resultsmentioning

confidence: 97%

“…As hybrids with high agronomic means associated with disease resistance, the combinations P8xL77, P1xP8, L70xP8 and L77xP8 (Table 2) can be highlighted, with a satisfactory performance for all traits. Complementary to the mean grouping data results, the discrimination of the general and specific combining ability effects provides important information about the performance of the parents and hybrids under study, generating more precise bases for genotype selection and continuity of the breeding program (Hallauer et al al., 2010).…”

Section: Resultsmentioning

confidence: 99%

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Research Article Combining ability of popcorn lines for resistance to the fungus Puccinia polysora (Pucciniaceae)

Schmitt¹,

Lima²,

Júnior³

et al. 2019

Genet. Mol. Res.

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The selection of southern rust-resistant genotypes caused by Puccinia polysora (Pucciniaceae) is considered an efficient way to control this disease, which causes high crop losses in popcorn. To help choose adequate cultivars, we examined the combining ability of lines and the agronomic performance of popcorn hybrids for rust resistance. Eight S 7 popcorn lines were used, which were crossed in a complete diallel mating scheme, resulting in 56 hybrids. The disease incidence on the whole plant (INC), severity on a leaf of the main ear (SEV), grain yield (GY), popping expansion (PE) and volume of expanded popcorn per hectare (PV) were evaluated. Analysis of variance was performed and the means were grouped by the Scott-Knott algorithm. The analysis diallel was performed by the method of Griffing, using the Diallel I method. The hybrids L76xP8, P8xL70, L77xP8, P8xP1 and L55xL76 stood out with a GY of >3000 kg.ha -1 and PE of >30 mL.g -1 . For the traits GY and VP, the nonadditive effects were predominant, and the heterosis effects high. For the trait expression of INC, SEV and PE, the additive effects were more relevant. The estimates of general combining ability of lines L70, L61, P1 and L76 were negative for INC and SEV. For ©FUNPEC-RP www.funpecrp.com.br Genetics and Molecular Research 18 (3): gmr18330 K.F.M. Schmitt et al. 2 commercial cultivation, L77xL76, L76xP1, L77xL70, L76xL70, L70xL76 and L77xP1 are recommended, in view of their excellent agronomic performance and superior resistance to rust.

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Section: Resultsmentioning

confidence: 97%

Section: Resultsmentioning

confidence: 99%

Research Article Combining ability of popcorn lines for resistance to the fungus Puccinia polysora (Pucciniaceae)

Schmitt¹,

Lima²,

Júnior³

et al. 2019

Genet. Mol. Res.

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“…Self-fertilization is the driving mechanism of endogamy, since it allows that common alleles by ancestry be found in the same individual, presenting great importance to obtain lineages. The value of a population as lineage source is highly dependent on inbreeding depression in relation to several characteristics, limiting the potential of obtaining vigorous lineages for subsequent production of hybrids (HALLAUER et al, 2010). In order to obtain lineages with acceptable probability, a breeding program should start with populations with high frequency of favorable alleles of important traits, while presenting low frequency of undesirable alleles BARRIGA, 1992).…”

Section: Introductionmentioning

confidence: 99%

“…The use of endogamic progenies can be a good strategy for traits that present low heritability, since inbreeding makes available greater genetic variability due to the crossing system, which allows obtaining estimates for the favorable genetic parameters in the selection process. In the breeding perspective, endogamy can be potentially used for the development of lineages with alleles of interest which, subsequently, will be used in the composition of simple, double or triple maize hybrids, or even in recurrent selection involving partially endogamic progenies (S 1 , S 2 and S 3 ), for the development of improved populations (HALLAUER et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

Inbreeding depression and genetic variability in agricultural traits and resistance to phytopathogens in exotic maize populations

et al. 2020

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The effect known as depression by inbreeding refers to the reduction on the average value of quantitative traits, related to plant reproduction and physiology, due to the homozygosis of deleterious alleles. This study evaluated the inbreeding depression and the genetic variability of agricultural traits and of the resistance to phytopathogens in inbred families of two exotic maize populations. The experiments were done in the experimental area of the Universidade Federal de Goiás, Regional Jataí, in the second harvest 2015. Fifty and 40 FS1 of NAP5 and NAP7 populations, respectively, were evaluated interplanting one row with a mixture of base population at every ten plots to estimate depression by inbreeding of the traits evaluated. The experimental design was randomized blocks, with three replications. The following traits were evaluated: AP – plant height (cm), AE – ear height (cm), FM – male flowering (days), PQ – number of broken plants, AC – number of lodged plants, PG – kernel production (kg plot-1). The greatest estimates of depression by inbreeding in the agricultural traits were observed for kernel production, with values of 51.2 and 38.9% for the populations NAP5 and NAP7, respectively. Among the traits of resistance to phytopathogens, the greatest estimate was observed for the stunting complex, with values of -58.9% in NAP5 and -74.2% in NAP7. Both populations under study presented genetic potential to be used in breeding programs with recurrent selection and, after some selection cycles, lineages with good agricultural standard and resistance to phytopathogens can be obtained.

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“…Conventional plant breeding has been efficient in increasing the yield of most major crops, especially under favorable environments [1]. For example, in the USA, maize yields increased by more than five-fold since 1930, mainly due to the development of uniform hybrid varieties [2]. However, conventional plant breeding was less successful in traditional low-input or organic farming systems in which more severe stress conditions are experienced [3].…”

Section: Introductionmentioning

confidence: 99%

Maize Open-Pollinated Populations Physiological Improvement: Validating Tools for Drought Response Participatory Selection

et al. 2019

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Participatory selection—exploiting specific adaptation traits to target environments—helps to guarantees yield stability in a changing climate, in particular under low-input or organic production. The purpose of the present study was to identify reliable, low-cost, fast and easy-to-use tools to complement traditional selection for an effective participatory improvement of maize populations for drought resistance/tolerance. The morphological and eco-physiological responses to progressive water deprivation of four maize open-pollinated populations were assessed in both controlled and field conditions. Thermography and Chl a fluorescence, validated by gas exchange indicated that the best performing populations under water-deficit conditions were ‘Fandango’ and to a less extent ‘Pigarro’ (both from participatory breeding). These populations showed high yield potential under optimal and reduced watering. Under moderate water stress, ‘Bilhó’, originating from an altitude of 800 m, is one of the most resilient populations. The experiments under chamber conditions confirmed the existence of genetic variability within ‘Pigarro’ and ‘Fandango’ for drought response relevant for future populations breeding. Based on the easiness to score and population discriminatory power, the performance index (PIABS) emerges as an integrative phenotyping tool to use as a refinement of the common participatory maize selection especially under moderate water deprivation.

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Breeding Plans

Cited by 151 publications

References 70 publications

Research Article Combining ability of popcorn lines for resistance to the fungus <i>Puccinia</i> <i>polysora</i> (Pucciniaceae)

Research Article Combining ability of popcorn lines for resistance to the fungus <i>Puccinia</i> <i>polysora</i> (Pucciniaceae)

Inbreeding depression and genetic variability in agricultural traits and resistance to phytopathogens in exotic maize populations

Maize Open-Pollinated Populations Physiological Improvement: Validating Tools for Drought Response Participatory Selection

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