Analysis of self-fertilization and meiotic behavior of eleven Brazilian triticale cultivars at two sowing dates

Guerra, Divanilde; Pacheco, Marcelo Teixeira; Federizzi, Luiz Carlos

doi:10.1590/s1984-70332011000200003

Cited by 5 publications

(8 citation statements)

References 22 publications

(25 reference statements)

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“…Hereof, other reports have confirmed the impact of genetic (Falcao et al 1981, Nirmala andRao 1996) and environmental (Bione et al 2000, Guerra et al 2011) factors on meiosis. Among environmental factors, high temperature is one of the most important factors that influence meiotic behavior and cause abnormalities in meiosis (Ahmad et al 1984, Saini andAspinall 1982).…”

Section: Discussionsupporting

confidence: 63%

“…Although cytogenetic studies in the past decades have reported different meiotic abnormalities in wheat and other different plants, studies on the heat effects on meiosis and related abnormalities have been rarely reported. In previous studies, the following meiotic abnormalities have been reported: the presence of laggard chromosomes in anaphase I and II in wheat (Rezaei et al 2010), triticale (Falcao et al 1981, Guerra et al 2011 and Isoetes sinensis (Heng-Chang et al 2007); precocious migration of chromosomes in the metaphase stage in wheat (Rezaei et al 2010) and Brachiaria inter-species hybrid (Fuzinatto et al 2008); presence of micronuclei in tetrad and produced microspores in triticale (Guerra et al 2011, Rezaei et al 2010 and Brachiaria inter-species hybrid (Fuzinatto et al 2008); non-placement of chromosomes in the equatorial plate of cells in the metaphase stage in Brachiaria brizantha (Daniela et al 2005); pyknosis in soybean (Bione et al 2000); occurrence of cytomixis in Bromu ssp. (Sheidai and Fadaei 2005), Isoetes sinensis (Heng-Chang et al 2007) and species of grasses (Falistocco et al 1995); and occurrence of abnormal cytokinesis in Rosa sp.…”

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confidence: 96%

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The Influence of Terminal Heat Stress on Meiosis Abnormalities in Pollen Mother Cells of Wheat

et al. 2014

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SummaryTo study the effects of high temperature on the meiosis of pollen mother cells (PMCs) and to determine their relationship with grain set, two in situ experiments were conducted between 2010 and 2012 on four wheat cultivars, Kauz, Montana, M6 and Chamran, under normal (normal cultivation) and terminal heat stress (late cultivation) conditions. Due to the delay in cultivation for the cultivars under stress conditions, their flowering stage faced heat stress at the end of the growing season, and therefore, a significant (p ≤ 0.05) increase was observed in meiotic abnormalities. Cytogenetic studies discovered that the meiosis in PMCs and the pollen development are strongly influenced by heat. Based on the results, abnormalities such as precocious chromosome migration to the poles, laggard chromosomes, micronuclei, absence of metaphase plate, pyknosis, abnormal cytokines, cytomixis and abnormal tetrad were observed in different cultivars. The sensitive cultivars, M6 and Montana, had the greatest percentages of meiotic abnormalities. The meiotic abnormalities showed a significant negative correlation with the number of kernels per spike under terminal heat stress conditions (r = 0.54, n =16, p ≤ 0.01). In other words, due to increasing meiosis abnormalities under terminal heat stress, the grain set was greatly reduced, especially in the susceptible cultivars. The result of this experiment showed that studying the meiosis in PMCs can be suggested as one of the research necessary to improve commercial heat-tolerant cultivars, and to some extent, as a method for screening tolerant lines in breeding programs.

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Section: Discussionsupporting

confidence: 63%

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confidence: 96%

The Influence of Terminal Heat Stress on Meiosis Abnormalities in Pollen Mother Cells of Wheat

et al. 2014

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“…Abnormalities in the meiotic process, leading to reduced pollen viability, has been described in other plants, such as Zea mays, Paspalum (Paspalum spp. ), triticale (x Triticosecale Wittmack), soybean (Glycine max) and brassicas (Brassica napus and B. Campestris) (Bione et al 1999, Pagliarini 2000, Guerra et al 2011). …”

Section: Discussionmentioning

confidence: 99%

Reproductive characteristics of citrus rootstocks grown under greenhouse and field environments

Guerra

Wittmann

Schwarz

et al. 2013

Crop Breed. Appl. Biotechnol.

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-The aim of the present study was to evaluate the possible effect of environmental factors on meiosis, meiotic index, pollen viability and in vitro germination of pollen from stock plants of the rootstocks Trifoliate, 'Swingle', 'Troyer', 'Fepagro C13', 'Fepagro C37' and 'Fepagro C41' grown 28%, 56.23% and 74.74%, and, in the greenhouse, 64.25%, 41.41% and 66.71%, respectively. As temperature oscillations were higher in the greenhouse than in the field, we suggest that this negatively affects the reproductive characteristics analyzed.

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“…Em virtude de fatores bióticos e abióticos também influenciarem na formação do grão de pólen e na interação genótipo/ambiente (local/ano), é relevante que em um programa de melhoramento genético vegetal a técnica da viabilidade polínica seja utilizada rotineiramente, a fim de agregar maior conhecimento sobre o material trabalhado, avançar na seleção e priorizar os melhores cruzamentos, excluindo ou deixando para estudos posteriores os materiais instáveis. Entretanto, Guerra et al (2011) abordaram que há escassez de estudos na tentativa de analisar a fertilidade e a estabilidade meiótica de cultivares brasileiras de triticale, especialmente de diferentes genótipos comparando programas de melhoramento genético distintos e ano de cultivo.…”

Section: Introductionunclassified

Estabilidade genética em triticale estimada pela viabilidade polínica

Brambatti

Brammer

Wiethölter³

et al. 2016

Arq. Inst. Biol.

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RESUMO: O estudo visou inferir sobre a estabilidade genética, com base na viabilidade polínica, em genótipos de triticale hexaploide utilizados no bloco de cruzamentos do programa de melhoramento genético da Empresa Brasileira de Pesquisa Agropecuária (Embrapa Trigo). O experimento foi conduzido em delineamento inteiramente casualizado. Para cada genótipo, foram avaliadas cinco repetições e cada repetição foi constituída por uma planta. Analisaram-se, por meio de microscopia óptica e pela técnica de Squash com corante carmim acético 1%, 200 grãos de pólen por lâmina, totalizando 1.000 grãos de pólen por genótipo. As variáveis analisadas foram: grãos de pólen binucleados e trinucleados, com pouco amido, vazios, com mais de um poro e de tamanhos diferentes. Os dados obtidos foram submetidos à análise de variância e as médias comparadas pelo teste de Tukey a 1%. Houve diferença significativa entre todas as variáveis. A porcentagem de grãos de pólen binucleados e/ou trinucleados variou de 74 a 97%. Concluiu-se que 66% dos genótipos avaliados apresentaram viabilidade polínica acima de 90%, sendo indicados a continuar fazendo parte do programa de melhoramento genético de triticale, tanto na seleção de parentais como durante os cruzamentos e retrocruzamentos. Portanto, os estudos citogenéticos representam excelente ferramenta de apoio ao melhorista na escolha dos genótipos mais estáveis.

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Analysis of self-fertilization and meiotic behavior of eleven Brazilian triticale cultivars at two sowing dates

Abstract: -Eleven Brazilian hexaploid triticale cultivars (2n = 6x = 42)

Cited by 5 publications

References 22 publications

The Influence of Terminal Heat Stress on Meiosis Abnormalities in Pollen Mother Cells of Wheat

The Influence of Terminal Heat Stress on Meiosis Abnormalities in Pollen Mother Cells of Wheat

Reproductive characteristics of citrus rootstocks grown under greenhouse and field environments

Estabilidade genética em triticale estimada pela viabilidade polínica

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