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au:"Benko-Iseppon, Ana Maria"

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First molecular analysis of the genus Bryopsis (Bryopsidales, Chlorophyta) from Brazil, with an emphasis on the Pernambuco coast
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Oliveira, Marcella Guennes Tavares de

; Pereira, Sonia Maria Barreto

; Benko-Iseppon, Ana Maria

; Balbino, Valdir Queiroz

; Silva Junior, Wilson José da

; Ximenes, Caroline Feijão

; Carvalho, Maria de Fátima de Oliveira

; Cassano, Valéria

Acta Botanica Brasilica

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jun 2021, Volume 35 N. 2 Pages 161 - 178

Abstract: En | Text: En | PDF: En

ABSTRACT The green algal genus Bryopsis has simple morphology and high phenotypic plasticity, making it difficult to identify its species based on morphological characteristics alone. This study evaluated the diversity of Bryopsis in northeastern Brazil (the State of Pernambuco), based on morphological and molecular data using the markers tufA and rbcL. Molecular analyses were incongruent with morphology, demonstrating the existence of cryptic and polymorphic species in the genus. Of the four taxa cited for the area based only on morphological data (Bryopsis corymbosa, B. pennata, B. plumosa, Bryopsis sp.), only B. pennata was recorded. Typical specimens of B. pennata and B. plumosa were grouped with low genetic divergence, 0-0.21 % for tufA and no divergence for rbcL, indicating that B. pennata is an extremely plastic species that includes specimens with morphotype B. “plumosa”. Bryopsis pennata var. secunda is cited for the first time for northeastern Brazil, with divergence from the typical variety of 0.96-1.57 % for tufA and 0.4 % for rbcL. This study showed that broader sampling of Bryopsis is necessary in order to confirm the taxonomic status of the species referenced for Brazil, whose phenotypic plasticity may cause overestimation of diversity or reveal cryptic species.

https://doi.org/10.1590/0102-33062020abb0154 272 downloads

Inheritance of cowpea resistance to Cowpea aphid-borne mosaic vírus
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Silva, Jeferson Araújo

; Costa, Antonio Félix da

; Benko-Iseppon, Ana Maria

; Guimarães, Lílian Margarete Paes

; Leitão, Diego Arruda Huggins de Sá

; Nicoli, Alessandro

Pesquisa Agropecuária Brasileira

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2021, Volume 56 elocation e02109

Abstract: Pt En | Text: Pt En | PDF: Pt | PDF: En

Resumo: O objetivo deste trabalho foi avaliar a herança de resistência ao Cowpea aphid-borne mosaic virus (CABMV) em feijão-caupi (Vigna unguiculata). O estudo foi realizado entre os genótipos parentais IT85F-2687 (resistente) e 'BR-14 Mulato' (suscetível), tendo-se obtido populações F1, F2 e F7 e retrocruzamentos com ambos os genótipos parentais. O CABMV foi inoculado nas plantas de todas as gerações, que foram, então, avaliadas por inspeção visual e pela descrição dos sintomas característicos. O teste do qui-quadrado foi aplicado após a classificação fenotípica de todas as plantas. Uma proporção de segregação de 1:3 (resistente:suscetível) na população F2 e de 1:1 na população F7 foi aceita, tendo indicado herança monogênica recessiva.

Abstract: The objective of this work was to evaluate the inheritance of resistance to Cowpea aphid-borne mosaic virus (CABMV) in cowpea (Vigna unguiculata). The study was performed between parental genotypes IT85F-2687 (resistant) and 'BR-14 Mulato' (susceptible), generating F1, F2, and F7 populations and backcrosses with both parental genotypes. CABMV was inoculated on plants from all generations, which were then evaluated through visual inspection and description of characteristic symptoms. A chi-square test was performed after the phenotypic classification of all plants. A segregation proportion of 1:3 (resistant:susceptible) in population F2 and of 1:1 in population F7 was accepted, showing a recessive monogenic inheritance.

https://doi.org/10.1590/s1678-3921.pab2021.v56.02109 495 downloads

An overview of the Sixth International Conference on the Comparative Biology of Monocotyledons - Monocots VI - Natal, Brazil, 2018
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Versieux, Leonardo M.

; Calvente, Alice

; Carvalho, Fernanda Antunes

; Fonseca, Carlos Roberto

; Lichston, Juliana Espada

; Voigt, Eduardo

; Fontes, Anderson Lopes

; Roque, Alan

; Williams, Joseph Hill

; Oliveira, Reyjane Patrícia de

; Viana, Pedro Lage

; Mercier, Helenice

; Palma-Silva, Clarisse

; Wendt, Tânia

; Temponi, Lívia Godinho

; Andrade, Ivanilza Moreira de

; Oriani, Aline

; Leandro, Thales D.

; Pessoa, Edlley Max

; Martinelli, Adriana Pinheiro

; André, Thiago

; Benko-Iseppon, Ana Maria

; Berg, Cássio van den

; Luz, Cynthia Fernandes Pinto da

; Prosdocimi, Francisco

; Jardim, Jomar G.

; Alves, Marccus

; Wanderley, Maria das Graças Lapa

; Forzza, Rafaela Campostrini

; Scatena, Vera Lucia

; Clark, Lynn G.

Rodriguésia

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2021, Volume 72 elocation e00622019

Abstract: Pt En | Text: Pt En | PDF: Pt | PDF: En

Resumo Neste artigo nós apresentamos uma visão geral dos resumos, programação científica e social, viagens de campo e informações acerca do número de inscritos, países participantes, patrocínios e temas tratados durante a Sexta Conferência Internacional sobre Biologia Comparada de Monocotiledôneas, realizada em Natal, Brasil, de 7 a 12 de outubro de 2018. Alguns comentários recebidos pelos organizadores e sugestões para os organizadores do próximo Monocots, na Costa Rica, também são fornecidos. Este artigo complementa os dados publicados no livro de resumos, disponível no Repositório Digital da UFRN.

Abstract In this paper we present an overview of the abstracts, scientific and social programs, field trips, and achievements in terms of participant number, represented countries, sponsorships, and themes treated during the Sixth International Conference on the Comparative Biology of Monocotyledons that took place in Natal, Brazil, October 7th -12th 2018. Some comments received by the organizers and a few suggestions for organizers of the next meeting, in Costa Rica, are also provided. The conference’s complete abstract book was published and provide additional information.

https://doi.org/10.1590/2175-7860202172035 395 downloads

Reference genes for quantitative real-time PCR normalization of Cenostigma pyramidale roots under salt stress and mycorrhizal association
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Frosi, Gabriella

; Ferreira-Neto, José Ribamar Costa

; Bezerra-Neto, João Pacífico

; Lima, Laís Luana de

; Morais, David Anderson de Lima

; Pandolfi, Valesca

; Kido, Ederson Akio

; Maia, Leonor Costa

; Santos, Mauro Guida

; Benko-Iseppon, Ana Maria

Genetics and Molecular Biology

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2021, Volume 44 N. 2 elocation e20200424

Abstract: En | Text: En | PDF: En

Abstract Cenostigma pyramidale is a native legume of the Brazilian semiarid region which performs symbiotic association with arbuscular mycorrhizal fungi (AMF), being an excellent model for studying genes associated with tolerance against abiotic and biotic stresses. In RT-qPCR approach, the use of reference genes is mandatory to avoid incorrect interpretation of the relative expression. This study evaluated the stability of ten candidate reference genes (CRGs) from C. pyramidale root tissues under salt stress (three collection times) and associated with AMF (three different times of salinity). The de novo transcriptome was obtained via RNA-Seq sequencing. Three algorithms were used to calculate the stability of CRGs under different conditions: (i) global (Salt, Salt+AMF, AMF and Control, and collection times), (ii) only non-inoculated plants, and (iii) AMF (only inoculated plants). HAG2, SAC1, aRP3 were the most stable CRGs for global and AMF assays, whereas HAG2, SAC1, RHS1 were the best for salt stress assay. This CRGs were used to validate the relative expression of two up-regulated transcripts in Salt2h (RAP2-3 and PIN8). Our study provides the first set of reference genes for C. pyramidale under salinity and AMF, supporting future researches on gene expression with this species.

https://doi.org/10.1590/1678-4685-gmb-2020-0424 217 downloads

Genome composition and pollen viability of Jatropha (Euphorbiaceae) interspecific hybrids by Genomic In Situ Hybridization (GISH)
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Souza, Rosilda Cintra de

; Marques, Daniela de Argollo

; de Carvalho Filho, Marcel Mamede

; Oliveira, Ana Rafaela da Silva

; Siqueira, Walter José

; Benko-Iseppon, Ana Maria

; Brasileiro-Vidal, Ana Christina

Genetics and Molecular Biology

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2019, Volume 42 N. 4 elocation e20190112

Abstract: En | Text: En | PDF: En

Abstract Interspecific hybridization is required for the development of Jatropha curcas L. improved cultivars, due to its narrow genetic basis. The present study aimed to analyze the parental genomic composition of F1 and BC1F1 generations derived from interspecific crosses (J. curcas/J. integerrima and J. curcas/J. multifida) by GISH (Genomic In Situ Hybridization), and the meiotic index and pollen viability of F1 hybrids. In F1 cells from both hybrids, 11 chromosomes of each parental was observed, as expected, but chromosome rearrangement events could be detected using rDNA chromosome markers, suggesting unbalanced cells. In the BC1F1, both hybrids had 22 chromosomes, suggesting that only n = 11 gametes were viable in the next generation. However, GISH allowed the identification of three and two alien chromosomes in J. curcas//J. integerrima and J. curcas//J. multifida BC1F1 hybrids, respectively, suggesting a preferential transmission of J. curcas chromosomes for both hybrids. Pollen viability in F1 hybrids derived from J. curcas/J. integerrima crosses were higher (82-83%) than those found for J. curcas/J. multifida (68%), showing post-meiotic problems in these last hybrids, with dyads, triads, polyads, and micronuclei as post-meiosis results. The here presented cytogenetic characterization of interspecific hybrids and their backcross progenies can contribute to the selection of the best genotypes for future assisted breeding of J. curcas.

https://doi.org/10.1590/1678-4685-gmb-2019-0112 819 downloads

Evidence of genetic differentiation and karyotype evolution of the sedges Cyperus ligularis L. and C. odoratus L. (Cyperaceae)
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Cruz, Geyner Alves dos Santos

; Vasconcelos, Santelmo

; Pinangé, Diego Sotero de Barros

; Gonçalves-Oliveira, Rodrigo Cesar

; Alves, Marccus Vinícius

; Torres, Rodrigo Augusto

; Benko-Iseppon, Ana Maria

Acta Botanica Brasilica

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jun 2018, Volume 32 N. 2 Pages 264 - 270

Abstract: En | Text: En | PDF: En

ABSTRACT The taxonomy of Cyperaceae is complex, with genera like Cyperus harboring species complexes. We analyzed the genetic similarity between Cyperus ligularis L. and C. odoratus L. based on DNA fingerprinting and cytogenetics. Significative genetic differentiation (G ST = 0.363) and low gene flow (N m = 0.877) indicated a clear genetic distinction between the two species. Moreover, the clustering analysis showed two distinct genetic groups, suggesting a lack of evidence for hybridization. The phenogram revealed two different lineages, and although all individuals of C. odoratus were collected from plots close to each other, they possessed greater genetic diversity than that observed among individuals of C. ligularis, which were sampled over a wider geographic range. Variation in chromosome number within the two species exhibited the opposite pattern, indicating greater karyotype stability in C. odoratus with 2n = 72 and 2n = 76, while the diploid number for C. ligularis varied from 2n = 66 to 88. The lower genetic variation in C. ligularis may be a result of the founder effect associated with seed dispersion and clonal reproduction. Field observations and analysis of reproductive biology should enrich the understanding of the genetic structure of the investigated populations and their role in successional processes.

https://doi.org/10.1590/0102-33062017abb0321 1078 downloads

Karyotype and genome size comparative analyses among six species of the oilseed-bearing genus Jatropha (Euphorbiaceae)
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Marinho, Anne C.T.A.

; Vasconcelos, Santelmo

; Vasconcelos, Emanuelle V.

; Marques, Daniela A.

; Benko-Iseppon, Ana Maria

; Brasileiro-Vidal, Ana Christina

Genetics and Molecular Biology

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jun 2018, Volume 41 N. 2 Pages 442 - 449

Abstract: En | Text: En | PDF: En

Abstract Jatropha is an important genus of Euphorbiaceae, with species largely used for various purposes, including the manufacturing of soaps and pharmaceutical products and applications in the bioenergetic industry. Although there have been several studies focusing J. curcas in various aspects, the karyotype features of Jatropha species are poorly known. Therefore, we analyzed six Jatropha species through fluorochrome staining (CMA/DAPI), fluorescent in situ hybridization (FISH) with 5S and 45S rDNA probes and genome size estimation by flow cytometry. Our results revealed several chromosome markers by both CMA/DAPI and FISH for the analyzed species. Five Jatropha species (J. curcas, J. gossypiifolia, J. integerrima, J. multifida and J. podagrica) showed four CMA-positive (CMA+) bands associated with the 5S and 45S rDNA sites (one and two pairs, respectively). However, J. mollissima displayed six CMA+/DAPI- bands co-localized with both 5S and 45S rDNA, which showed a FISH superposition. A gradual variation in the genome sizes was observed (2C = 0.64 to 0.86 pg), although an association between evidenced heterochromatin and genome sizes was not found among species. Except for the unique banding pattern of J. mollissima and the pericentromeric heterochromatin of J. curcas and J. podagrica, our data evidenced relatively conserved karyotypes.

https://doi.org/10.1590/1678-4685-gmb-2017-0120 1206 downloads

Genotoxic potential of the latex from cotton-leaf physicnut (Jatropha gossypiifolia L.)
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de Almeida, Pedro Marcos

; de Sousa Araújo, Silvany

; Marin-Morales, Maria Aparecida

; Benko-Iseppon, Ana Maria

; Brasileiro-Vidal, Ana Christina

Genetics and Molecular Biology

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mar 2015, Volume 38 N. 1 Pages 93 - 100

Abstract: En | Text: En | PDF: En

Jatropha gossypiifolia L. (Euphorbiaceae), popularly known as cotton-leaf physicnut, is a milky shrub notable for its medicinal properties. The present study aimed to evaluate the toxic, cytotoxic and genotoxic effects of the latex of J. gossypiifolia, using Allium cepa L. as test system. Seeds of A. cepa were exposed to five concentrations of the latex (1.25; 2.5; 5; 10 and 20 mL/L) in order to evaluate parameters of toxicity (evaluation of root growth), cytotoxicity (mitotic index frequency) and genotoxicity (frequency of chromosome alterations). The latex showed a significant decrease in root mean growth value as well as mitotic index for the tested concentrations, except for 1.25 mL/L, when compared to results from the negative control. The 1.25, 2.5 and 5 mL/L concentrations induced significant chromo-some adherences, C-metaphases and/or chromosome bridges, as genotoxic effects. The significant frequency of chromosome bridges also indicated mutagenic potential for chromosomes of J. gossypiifolia as discussed in the paper. Considering that the latex is used in popular therapies, and that the test system A. cepa presents good correlation with tests carried out in mammals, it can be pointed out that its use for medicinal purposes may be harmful to human health especially if ingested.

https://doi.org/10.1590/S1415-475738120140162 3817 downloads

Molecular cytogenetic characterization of parental genomes in the partial amphidiploid Triticum aestivum x Thinopyrum ponticum
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Brasileiro-Vidal, Ana Christina

; Cuadrado, Angeles

; Brammer, Sandra P.

; Benko-Iseppon, Ana Maria

; Guerra, Marcelo

Genetics and Molecular Biology

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2005, Volume 28 N. 2 Pages 308 - 313

Abstract: En | Text: En | PDF: En

The wheat line PF 839197 and six hybrid derivatives from a cross between PF 839197 and Thinopyrum ponticum were cytologically characterized by fluorescent in situ hybridization (FISH). Probes for the 5S and 45S rDNA genes (pTa794 and pTa71, respectively), a highly repetitive rye sequence (pSc119.2), the synthetic oligonucleotide (AAG)5, and total genomic DNA from Th. ponticum and rye were used. In the wheat line, a 1RS.1BL translocation was revealed by the labeling patterns produced with pSc119.2 and (AAG)5, and confirmed by genomic in situ hybridization (GISH) using rye genomic DNA as a probe. Analyses of partial amphiploids confirmed previous results indicating mitotic instability, with a tendency to stabilize at 2n = 42 or 56. GISH with Th. ponticum genomic DNA showed that in one hybrid derivative, with lower chromosome numbers (2n = 42-45), chromosomes were not labeled, whereas in the hybrids with 2n = 48-56 up to 14 chromosomes were labeled. These data suggest that the original chromosome set of these hybrids was 2n = 56, and that chromosomes from both genomes were lost by mitotic instability. FISH using the rDNA probes and GISH with Thinopyrum genomic DNA suggested that cells with 2n = 56 contained an entire wheat genome plus two monoploid chromosome sets of Th. ponticum.

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