Parâmetros genéticos de caracteres relacionados à tolerância à deficiência hídrica em milho tropical

Camara, T. M. M.; Bento, Dyeme Antonio Vieira; Alves, Gabriela Cavalcanti; Santos, M. F.; Moreira, J. U. V.; Júnior, Cláudio Lopes de Souza

doi:10.1590/s0006-87052007000400009

Cited by 31 publications

(39 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Ainda segundo esses autores, o oxigênio é também fator fundamental para o processo germinativo, pois participa da degradação das substâncias de reserva da semente para o fornecimento de nutrientes e energia para o desenvolvimento do eixo embrionário. A escolha da cultivar a ser utilizada é um dos principais fatores de sucesso para a cultura do milho (ARAÚJO & NASS, 2002), visto que existem genótipos que são adequados às diferentes condições climáticas brasileiras (EMBRAPA, 2012), podendo até, por exemplo, possuir tolerância ao déficit hídrico (PIMENTEL, 1999;CÂMARA et al, 2007), ao alagamento (ALVES et al, 2002) ou à incidência de algumas doenças (VON PINHO et al, 2001;SILVA et al, 2002).…”

Section: Introductionunclassified

Comportamento germinativo de sementes de cultivares de milho sob condições de hipoxia

2014

View full text Add to dashboard Cite

ResumoA diversidade genética existente no milho permite seu cultivo nos mais diversos ambientes. Contudo, o excesso de chuva, em regiões úmidas e quentes, logo após a semeadura, pode prejudicar a germinação por restringir o oxigênio ou causar danos embrionários provocados pela embebição demasiadamente rápida. Deste modo, este trabalho teve por objetivo verificar os efeitos de períodos de hipoxia na germinação de sementes de diferentes cultivares de milho. Foram utilizados três tipos de cultivares, sendo dois híbridos (DKB 787 e AG 8088), uma variedade melhorada (IPR 114) e duas variedades crioulas (Asteca e Caiano) submetidos a 4; 8; 12; 24; 36; 48 e 96 horas de hipoxia, sob temperatura de 25 ºC, com quatro repetições de 50 sementes. A qualidade inicial das sementes foi caracterizada pelos testes de germinação, de emergência de plântulas no campo, de envelhecimento acelerado e de frio. Após os períodos de hipoxia, as sementes foram submetidas ao teste de germinação com avaliação das porcentagens de plântulas normais, anormais, sementes mortas e massa seca de plântulas. A hipoxia reduz a porcentagem de germinação das sementes e aumenta a porcentagem de plantas anormais em todas as cultivares. As cultivares Asteca e Caiano apresentam menor porcentagem de germinação. O incremento do período de hipoxia causa mortalidade de sementes para as cultivares IPR 114 e DKB 787. As cultivares DBK 787 e AG 8088 apresentam menor massa seca de plântulas e menor sensibilidade às condições de hipoxia que a variedade e as cultivares crioulas.Palavras-chave adicionais: alagamento; encharcamento do solo; tolerância; variedades crioulas; Zea mays. AbstractMaize genetic diversity permits its cultivation under most of the environmental conditions. Excessive rain in hot and humid regions soon after seed sowing may, though, hamper germination due to lack of oxygen or cause damage to the embryo axis due to a very rapid imbibition. So, this study had the objective of verifying the effects of periods of hypoxia on the germination of seeds of several maize cultivars. Three types of maize cultivars were used : two hybrids (DKB 787 and AG 8088), one improved variety (IPR 114),and two landrace varieties (Asteca and Calano) whose seeds were submitted to 4, 8, 12, 24, 48, and 96 hours of hypoxia under a temperature of 25 °C with four repetitions of 50 seeds. Seed initial quality was evaluated by means of germination, seedling emergence in the field, accelerated aging, and cold test. After the hypoxia treatments, the seeds were submitted to the germination test evaluating the percentage of normal seedlings, abnormal seedlings, dead seeds, and the seedlings dry matter content. Hypoxia reduced seeds germination percentage and increased the percentage of abnormal seedlings in all cultivars. Cultivars Asteca and Caiano presented the lowest germination percentage. Increasing hypoxia duration causes seed death in cultivars IPR 114 and DKB 787. Cultivars DKB 787 and AG 8088 seedlings were the ones with the lowest dry matter content in comparison with the ...

show abstract

Section: Introductionunclassified

Comportamento germinativo de sementes de cultivares de milho sob condições de hipoxia

2014

View full text Add to dashboard Cite

show abstract

“…For the other traits, V g was the main fraction of the phenotypic variance (V p ), indicating that the observed differences are from genetic nature. In plant breeding, it is fundamental to obtain estimates of genetic parameters, allowing to identify the gene action nature involved in the control of the quantitative traits and to evaluate the efficiency of different breeding strategies to obtain genetic gains and to maintain adequate genetic basis in populations (Câmara et al, 2007). Cruz et al (2012) mention that when the adopted statistical model considers the genotypes as fixed effect, such as in the present study, the heritability passes to be denominated genotypic coefficient of determination (R 2 ).…”

Section: Resultsmentioning

confidence: 99%

Genetic parameters and path analysis in cowpea genotypes grown in the Cerrado/Pantanal ecotone

Lopes¹,

Teodoro²,

Silva³

et al. 2017

Genet. Mol. Res.

View full text Add to dashboard Cite

ABSTRACT. Estimating genetic parameters in plant breeding allows us to know the population potential for selecting and designing strategies that can maximize the achievement of superior genotypes. The objective of this study was to evaluate the genetic potential of a population of 20 cowpea genotypes by estimating genetic parameters and path analysis among the traits to guide the selection strategies. The trial was conducted in randomized block design with four replications. Its morphophysiological components, components of green grain production and dry grain yield were estimated from genetic use and correlations between the traits. Phenotypic correlations were deployed through path analysis into direct and indirect effects of morphophysiological traits and yield components on dry grain yield. There were significant differences (P < 0.01) between the genotypes 2 K.V. Lopes et al. Genetics and Molecular Research 16 (2): gmr16029559 for most the traits, indicating the presence of genetic variability in the population and the possibility of practicing selection. The population presents the potential for future genetic breeding studies and is highly promising for the selection of traits dry grain yield, the number of grains per pod, and hundred grains mass. A number of grains per green pod is the main determinant trait of dry grain yield that is also influenced by the cultivar cycle and that the selection for the dry grain yield can be made indirectly by selecting the green pod mass and green pod length.

show abstract

“…Edwards (2011) reports that the selection for reducing the number of branches, the lower leaf angle and synchrony between male and female flowering, contribute to the increase in grain yield. In the same context, Câmara et al (2007) reported that the breeding programs for tolerance to abiotic stresses regard for character selection purposes as the number of branches, the period between the male and female flowering, prolificacy and delayed senescence of leaves (stay green).…”

Section: Resultsmentioning

confidence: 99%

Partial diallel analysis among maize lines for characteristics related to the tassel and the productivity

Nardino¹,

Souza²,

Baretta³

et al. 2016

Afr. J. Agric. Res.

View full text Add to dashboard Cite

Diallel crosses are important to the prediction of the best combinations among different heterotic groups of maize lines. The work objective was to estimate the combining ability among inbred lines from two heterotic groups to predict the best combinations in traits related to tassel and grain yield, conducted in five environments in the southern region. The inbred lines of the two heterotic groups are from the company KSP seeds. The tests were conducted based on crosses with partial diallel, using 15 female parents and male parents 8, 2011/2012 agricultural harvest in five environments in randomized blocks design with three replications. The variables analyzed were tassel length (TL), distance from the last node to the first branch of the tassel (DLN), distance from the flag leaf to the first branch of the tassel (DFL), number of tassel branches (NB), mass thousand grains (MTG) and grains yield (GY). The data were submitted the individual and joint variance analysis, after were realized analyze partial diallel analysis. The additive effects were more important for group II, already to the group I the non-additive effects were more pronounced, for the traits tassel and of yield. The GCA (group I) of lines inbred 15; 4 and 3-4 (group II) are favorable for increasing the grains yield. The crosses promising tassel traits been: 1-3, 2-4, 3-3, 4-4, 7-3,

show abstract

Parâmetros genéticos de caracteres relacionados à tolerância à deficiência hídrica em milho tropical

Cited by 31 publications

References 8 publications

Comportamento germinativo de sementes de cultivares de milho sob condições de hipoxia

Comportamento germinativo de sementes de cultivares de milho sob condições de hipoxia

Genetic parameters and path analysis in cowpea genotypes grown in the Cerrado/Pantanal ecotone

Partial diallel analysis among maize lines for characteristics related to the tassel and the productivity

Contact Info

Product

Resources

About