Use of Heterosis in Maize Breeding: History, Methods and Perspectives – A Review

Paterniani, M.E.A.G.Z.

doi:10.13082/1984-7033.v01n02a07

Cited by 13 publications

(14 citation statements)

References 48 publications

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“…With the aim of obtaining new early commercial hybrids adapted to the conditions of the second crop season or for the breeding populations (Miranda et al, 2003;Teixeira et al, 2015;Bolson et al, 2016), crossing lines of groups I and II is suggested, provided they belong to distinct heterotic groups (Paterniani, 2001). In order to predict some of these crosses, we considered the longest distances between the lines in the Mahalanobis matrix (Table 6).…”

Section: Multivariate Analysismentioning

confidence: 99%

Genetic diversity of maize lines for traits related to maturity and yield components

Friske¹,

Schuelter²,

Schuster³

et al. 2018

Aust J Crop Sci

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Grain yield and maturity class are among the commercial traits that most often direct maize breeding that aims to meet the requirements of the seed market. Thus, the aim of this study was to evaluate genetic diversity in maize inbred lines for grain maturity and yield components. The phenotypic attributes of 81 maize inbred lines were assessed in a field experiment in a square lattice design with three replications. Analysis of variance and multivariate analysis were performed considering complete randomized blocks due to the equivalence to the estimation for lattice efficiency. The results of analysis of variance indicated genetic diversity in the germplasm for all the traits, showing high variability for number of days to male flowering (DMF) and female flowering (DFF). Genetic diversity was also detected for grain water loss, which was determined by the area under the water loss curve (AUWLC), an index representing the dynamic progress of field water loss, based on area under the disease progress curve (AUDPC). The high magnitude of genetic correlation between the AUWLC and the moisture content of grain (0.98) collected at different moments in the R6 stage suggests the possibility of its substitution by the moisture content evaluation in only one collection. Weak genetic correlations (0.07 to 0.45) between yield and maturity components indicated the possibility of selection for earliness without compromising yield. In addition, the results of the Tocher method and the UPGMA were compatible, enabling classification of the germplasm and suggestion of hybrid combinations among inbreds that might have a higher heterotic effect on yield associated with earliness.

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Section: Multivariate Analysismentioning

confidence: 99%

Genetic diversity of maize lines for traits related to maturity and yield components

Friske¹,

Schuelter²,

Schuster³

et al. 2018

Aust J Crop Sci

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“…Todavia, tem-se constatado a melhor adaptação dos híbridos em relação às cultivares melhoradas difundidas na região em diversos trabalhos realizados no Nordeste brasileiro, nos quais os híbridos têm mostrado produtividade de 20% a 25% superior em relação às cultivares (Carvalho et al, 1999a(Carvalho et al, ,1999b (Paterniani, 2001). As vantagens produtivas dos híbridos de milho se devem, também, à menor estatura de planta, à menor esterilidade de plantas, à menor duração do subperíodo pendoamento-espigamento e às plantas com folhas de angulação mais ereta (Argenta et al, 2001 …”

Section: Tratamento ---------Alp-------------------ape---------------unclassified

Performance Produtiva De Cultivares De Milho Em Três Sistemas De Cultivo No Leste Maranhense

Silva

Moura

COSTA

et al. 2016

RBMS

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RESUMO -O LesteMaranhense corresponde à mais nova fronteira agrícola do Brasil. Entretanto, fatores limitantes da produtividade, como a escolha correta da variedade e o sistema de cultivo mais adequado para as condições locais, ainda são desconhecidos. Objetivou-se estudar o desempenho produtivo de 17 genótipos de milho, sob três sistemas de cultivo para a região. Foram realizados dois experimentos, um na cidade de Chapadinha e outro na cidade de Brejo, sendo avaliados 17 genótipos ao todo. Os ensaios foram dispostos no delineamento em blocos casualisados com quatro repetições em esquema fatorial 3x10 [10 cultivares e três sistemas de cultivo (plantio com cobertura de palha de carnaúba; plantio sem cobertura; plantio intercalado com feijão caupi)]. O sistema de cultivo com palha de carnaúba, independentemente do genótipo de milho e do local de avaliação, proporcionou os maiores rendimentos de grãos. Em Chapadinha, os genótipos mais produtivos foram as variedades de polinização aberta Caiano e Al-Bandeirante, o híbrido duplo AGN 1051, os híbridos triplos 2B 433, BRS 3060 e CMS 3E482 e o híbrido simples P 3646 H. Para Brejo, os melhores resultados foram obtidos pelos híbridos duplos 2B 707 HX e AGN 1051 e pelos híbridos simples 2B 604 HX, 30 F35 H e P 3646 H. Palavras-chave: Zea mays L., Palhada, Rendimento de grãos PRODUCTIVE PERFORMANCE OF MAIZE CULTIVARS IN THREE FARMING SYSTEMS IN EAST MARANHÃO STATEABSTRACT -East Maranhão State is the newest agricultural frontier in Brazil. However, productivity limiting factors such as the correct choice of variety and the cropping system more suitable to the local conditions are still unknown. The objective of this study was to evaluate the productive performance of 17 maize genotypes under three cultivation systems for the region. Two experiments were carried out, one in the city of Chapadinha and another in the city of Brejo, evaluating 17 genotypes. The trials were arranged in a randomized block design with 4 replications in a 3x10 factorial scheme [10 cultivars and 3 cultivation systems (planting with cover of carnaúba straw, plantation without cover, intercropping with cowpea). The use of carnaúba straw provided the highest grain yields, regardless the maize genotype and the evaluation site,. In Chapadinha the most productive genotypes were the open-pollinated varieties Caiano and Al-Bandeirante, the double hybrid AGN 1051, the triple hybrids 2B 433, BRS 3060 and CMS 3E482 and the simple hybrid P 3646 H. PRODUCTIVE PERFORMANCE OF MAIZE CULTIVARS IN THREE FARMING SYSTEMS IN EAST MARANHÃO STATEABSTRACT -East Maranhão State is the newest agricultural frontier in Brazil. However, productivity limiting factors such as the correct choice of variety and the cropping system more suitable to the local conditions are still unknown. The objective of this study was to evaluate the productive performance of 17 maize genotypes under three cultivation systems for the region. Two experiments were carried out, one in the city of Chapadinha and another in the city of Brejo, evaluating ...

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“…Intraspecific and interspecific crossings comprehend important tools in genetic breeding programs. They are fundamental for the development of new varieties, once hybridization increases heterosis by the occurrence of new combinations of genes encoding agronomically important traits (Borém 1999, Paterniani 2001). Self-pollination may lead to loss in genetic variability due to inbreeding depression, which is a phenomenon aggravated in rare species (Reis et al 2005).…”

Section: Introductionmentioning

confidence: 99%

Self-, cross- and interspecific pollinations in Passiflora capsularis and P. rubra

et al. 2011

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-(Self-, cross-and interspecific pollinations in Passiflora capsularis and P. rubra). This study aimed to characterize the reproductive system of Passiflora capsularis L. and P. rubra L. In vivo controlled pollinations, in vitro pollen germination and pollen-ovule (P:O) ratio evaluation were conducted. In self-pollination, intraspecific and interspecific pollination, P. capsularis showed means of 62.5, 68.7 and 48.4% of fertilized flowers, while in P. rubra, the averages were 67.2, 62.5 and 46.9%, respectively. For in vitro germination, 52.2% of P. capsularis pollen grains germinated while in P. rubra, the percentage was 64.4. The P:O ratio was 22.4 for P. capsularis, and 27.4 for P. rubra, which included them in the category of obligatory autogamous. Passiflora capsularis and P. rubra can reproduce both by self-pollination and cross-pollination, and crossings between the two species succeeded though the success rate was lower than 50%. The characteristics of the reproductive system of both species allow the use of greater range of options on breeding methods for production of ornamental Passiflora plants.Key words -in vivo pollination, in vitro germination, passion flower, pollen-ovule ratio RESUMO -(Autopolinização, polinização cruzada e polinização interespecífica em Passiflora capsularis e P. rubra). O presente trabalho objetivou caracterizar o sistema reprodutivo de Passiflora capsularis L. e P. rubra L. Foram realizadas polinizações controladas in vivo, germinação in vitro do pólen e razão pólen:óvulo (P:O). Nas autopolinizações, polinizações intra-específicas e interespecíficas, P. capsularis apresentou em média 62,5, 68,7 e 48,4% de flores fertilizadas, enquanto em P. rubra a média foi de 67,2, 62,5 e 46,9%, respectivamente. Na germinação in vitro, 52,2% dos grãos de pólen de P. capsularis germinaram, enquanto em P. rubra o percentual foi 64,4%. A razão P:O foi 22,4 para P. capsularis e 27,4 para P. rubra, que as incluiu na categoria de autógamas obrigatórias. Passiflora capsularis e P. rubra podem se reproduzir por autopolinização e polinização cruzada, e cruzamentos entre as duas espécies foram bem sucedidos mesmo com baixa taxa de sucesso (menos de 50%). As características do sistema reprodutivo de ambas as espécies permitem a utilização de maiores opções de métodos de melhoramento para produção de plantas ornamentais de Passiflora.Palavras-chave -germinação in vitro, maracujazeiros, polinização in vivo, razão pólen-óvulo 1.Parte da dissertação de mestrado da primeira autora, Programa de

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Use of Heterosis in Maize Breeding: History, Methods and Perspectives – A Review

Cited by 13 publications

References 48 publications

Genetic diversity of maize lines for traits related to maturity and yield components

Genetic diversity of maize lines for traits related to maturity and yield components

Performance Produtiva De Cultivares De Milho Em Três Sistemas De Cultivo No Leste Maranhense

Self-, cross- and interspecific pollinations in Passiflora capsularis and P. rubra

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