Ploidy
Mostrando 1-12 de 235 artigos, teses e dissertações.
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1. May the crossing between diploid and tetraploid Italian ryegrass transfer glyphosate resistance to the next generation?
ABSTRACT Italian ryegrass (Lolium multiflorum Lam.) is a grass weed found in winter cereals, with several glyphosate-resistant diploid populations. Furthermore, the use of Italian ryegrass tetraploid genotypes creates an opportunity to increase the forage demand in replacement of diploid populations. The aim of this research was to evaluate the crossing capa
Bragantia. Publicado em: 2020-09
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2. Fitness Cost and Competitive Ability to Different Ploidy Levels in Ryegrass Genotypes
RESUMO: A competição intergenotípica de azevém tetraploide com a população natural diploide pode ser uma ferramenta para reduzir a frequência de indivíduos resistentes em uma área. O objetivo deste estudo foi identificar e comparar o desenvolvimento fenológico, custo adaptativo e habilidade competitiva entre genótipos de azevém diploide e tetrapl
Planta daninha. Publicado em: 04/11/2019
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3. Ploidy influences on metabolic substrate deposition of rainbow trout
ABSTRACT. Triploid fish are usually sterile. Thus, the energy and nutrients intended for sexual maturation may be available to enhance flesh quality and physical growth. The present study aimed to investigate differences in the metabolic substrates, lipids and proteins, between storage tissues from diploid and triploid female rainbow trout. Monthly, metaboli
Acta Sci., Anim. Sci.. Publicado em: 24/10/2019
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4. Assessment of somaclonal variation in indirect morphogenesis-derived plants of Arracacia xanthorrhiza
Resumo: O objetivo deste trabalho foi induzir e detectar a variação somaclonal em plantas de batata-baroa (Arracacia xanthorrhiza) regeneradas por morfogênese indireta, para avaliar o potencial dessa técnica em produzir novos genótipos para o melhoramento dessa cultura. Calos foram induzidos em segmentos de pecíolos no meio de Murashige & Skoog (MS) su
Pesq. agropec. bras.. Publicado em: 01/07/2019
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5. Whole-genome duplication and hemoglobin differentiation traits between allopatric populations of Brazilian Odontophrynus americanus species complex (Amphibia, Anura)
Abstract Two allopatric populations of Brazilian diploid and tetraploid Odontophrynus americanus species complex, both from São Paulo state, had their blood hemoglobin biochemically analyzed. In addition, these specimens were cytogenetically characterized. Biochemical characterization of hemoglobin expression showed a distinct banding pattern between the al
Genet. Mol. Biol.. Publicado em: 27/06/2019
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6. Micropropagation and Cellular Behaviour Changes During in vitro Flowering of Impatiens balsamina
RESUMO: Neste estudo, a micropropagação de Impatiens balsamina foi estabelecida a partir de explantes de caule e parte aérea. Os efeitos do GA3 e da glutationa na morfogênese dessa espécie também foram investigados, de modo a induzir o florescimento in vitro. Verificou-se que a melhor regeneração in vitro de plantas foi obtida em meio MS adicionado c
Planta daninha. Publicado em: 10/06/2019
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7. Detection of Somaclonal Variation in Micropropagated and Acclimatized Plantlets of Oryza sativa MRQ 74 from Stem Explants
RESUMO: No sistema de cultura de tecidos de plantas, o fornecimento excessivo de hormônios de crescimento vegetal pode inibir o crescimento e desenvolvimento dos regenerantes e, às vezes, induzir a variação somaclonal. Neste estudo, a concentração ideal de hormônios de crescimento para regeneração in vitro de Oryza sativa L. cv. MRQ 74 foi identific
Planta daninha. Publicado em: 08/04/2019
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8. In vitro induction and regeneration of tetraploids and mixoploids of two cassava cultivars
Abstract We report the in vitro induction of polyploids from two cassava cultivars by colchicine treatment. Shoot nodal segments, collected from in vitro cultivated plants of Porquinho and Vassourinha cultivars, were used as explants. Explants were treated in liquid media without and with colchicine (0.05, 0.10 or 0.15%), at 90 rpm, in the dark, for 48 or 96
Crop Breed. Appl. Biotechnol.. Publicado em: 2018-04
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9. Genetic transformation of Brachiaria brizantha cv. Marandu by biolistics
ABSTRACT Brachiaria brizantha is a forage grass well adapted to tropical areas and cultivated in millions of hectares in Brazil. The apomictic mode of reproduction in this species, in addition to differences in ploidy between sexual and apomictic plants, impairs crossbreeding. The development of a methodology to transform apomictic cultivars will provide an
An. Acad. Bras. Ciênc.. Publicado em: 2018-04
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10. Haploid identification using tropicalized haploid inducer progenies in maize
Abstract The aim of this study was to identify maize haploid plants and compare the efficiency of identification of maize haploid plants using the R1-nj morphological marker, plant vigor, flow cytometry, chromosome counting, and microsatellite molecular markers under tropical conditions. We also established a protocol for chromosome duplication in maize hapl
Crop Breed. Appl. Biotechnol.. Publicado em: 2018-03
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11. Intra- and interspecific karyotypic variations of the genus Senna Mill. (Fabaceae, Caesalpinioideae)
ABSTRACT Although the chromosome number 2n = 28 predominates in most species of the genus Senna, variations are often observed, resulting from either polyploidy (2n = 42, 56, 112) or disploidy (2n = 22, 24, 26) events. To better understand the karyotypic variations in Senna, we examined heterochromatin patterns of 10 species of that genus using chromomycin A
Acta Bot. Bras.. Publicado em: 06/11/2017
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12. Rat visceral yolk sac cells: viability and expression of cell markers during maternal diabetes
The function of the visceral yolk sac (VYS) is critical for embryo organogenesis until final fetal development in rats, and can be affected by conditions such as diabetes. In view of the importance of diabetes during pregnancy for maternal and neonatal health, the objective of this study was to assess fetal weight, VYS cell markers, and viability in female W
Braz J Med Biol Res. Publicado em: 10/07/2015