Sabiia Seb
PortuguêsEspañolEnglish
Embrapa
        Busca avançada

Botão Atualizar


Botão Atualizar

Ordenar por: RelevânciaAutorTítuloAnoImprime registros no formato resumido
Registros recuperados: 33
Primeira ... 12 ... Última
Imagem não selecionada

Imprime registro no formato completo
A holoparasitic plant severely reduces the vegetative and reproductive performance of its host plant in the Caatinga, a Brazilian seasonally dry forest Acta Botanica
Cruz Neto,Oswaldo; Leal,Inara Roberta; Santos,Jean Carlos; Lopes,Ariadna Valentina.
ABSTRACT Host-parasite interactions between plants may reduce the vegetative and reproductive performance of the host plant. Although it is well established that parasitic plants may negatively affect the metabolism and the number of vegetative/reproductive structures of their hosts, the effects of this interaction on the reproductive characteristics of the host plant are poorly understood. Here we document the interaction between Cuscuta partita (Convolvulaceae) and its main host, Zornia diphylla (Fabaceae), in the Caatinga of northeastern Brazil. We measured diverse reproductive/vegetative attributes of Z. diphylla in 60 plots randomly distributed in patches that were parasitized and not parasitized by C. partita. Both vegetative and reproductive...
Tipo: Info:eu-repo/semantics/other Palavras-chave: Caatinga; Cuscuta partita; Floral traits; Haustoria; Holoparasitic plants; Plant-plant interaction; Pollen viability; Reproductive success; Zornia diphylla.
Ano: 2017 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062017000100147
Imagem não selecionada

Imprime registro no formato completo
A putative mutant of a self-compatible yellow passion fruit with the corona color as a phenotypic marker Bragantia
Souza,Margarete Magalhães; Viana,Alexandre Pio; Pereira,Telma Nair Santana.
Yellow passion fruit (Passiflora edulis f. flavicarpa) is a self-incompatible crop with purple corona flowers (PCF). Plants exhibiting white corona flowers (WCF) were observed in an experimental field located in Campos dos Goytacazes - RJ, Brazil. This study was performed in order to test the fertility of these genotypes through studies of in vivo pollination, meiotic behavior and pollen viability. Using in vivo pollination, the mean fruit set percentage, obtained from self-pollinations at the moment that flowers open, was 70.83% in WCF and 0% in PCF. In terms of cytological analysis, for both kinds of plants, WCF and PCF, the meiotic behavior was considered regular, considering the high meiotic index estimated for both of them, 96.3% and 97.7%, and pollen...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Passion flower; Self-compatibility; In vivo pollination; Meiotic behavior; Pollen viability.
Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052010000100003
Imagem não selecionada

Imprime registro no formato completo
Backcrossing to increase meiotic stability in triticale. Repositório Alice
GIACOMIN, R. M.; ASSIS, R.; BRAMMER, S. P.; NASCIMENTO JUNIOR, A. do; SILVA, P. R. da..
2015
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: X Triticosecale; Wittmack; Meiosis; Pollen viability; Plant breeding; Cytogenetic; Triticale.
Ano: 2015 URL: http://www.alice.cnptia.embrapa.br/handle/doc/1029920
Imagem não selecionada

Imprime registro no formato completo
Biologia floral da candeia (Eremanthus erythropappus, Asteraceae) PFB - Pesquisa Florestal Brasileira
Vieira, Fábio de Almeida; Fajardo, Cristiane Gouvêa; Carvalho, Dulcinéia de.
O objetivo deste trabalho foi examinar e documentar a biologia floral e os polinizadores da candeia (Eremanthus erythropappus) em uma população natural, sendo estudados a antese, a morfologia floral, a receptividade estigmática, a viabilidade de pólen e os visitantes florais. As flores pequenas (10,17 mm de comprimento) são cor de rosa, hermafroditas e organizadas em densos capítulos (média = 29 flores). Foi observada alta porcentagem de pólen viável (77,25%) e relativamente pouca disponibilidade de néctar para os visitantes florais (0,63 μL). As abelhas Apis mellifera e Trigona sp. foram os visitantes mais frequentes. Os comprimentos dos botões, estiletes e flores variaram significativamente entre plantas.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Antese; Viabilidade de pólen; Visitantes florais; Óleo essencial Recursos Florestais; Engenharia Florestal; Botânica; Reprodução Anthesis; Pollen viability; Floral visitors; Essential oil.
Ano: 2012 URL: http://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/402
Imagem não selecionada

Imprime registro no formato completo
Botanical aspects of Heteropterys umbellata (Malpighiaceae): a cytological and palynological approach Anais da ABC (AABC)
Sousa,Saulo M.; Reis,Aryane C.; Gomes,Shaiany S.L.; Bernardo,Karina B.; Salimena,Fátima R.G.; Viccini,Lyderson F..
The genus Heteropterys is one of the major genera in Malpighiaceae. However, few cytological and palynological studies were reported. The present work described for the first time the chromosome number, heterochromatin pattern, meiotic behavior, pollen viability and palynological aspects of Heteropterys ubellata, a very spread species. One large Brazilian population was evaluated using conventional techniques for meiotic studies and acetolyse to access the pollen morphology. The species showed 2n = 20 chromosomes, normal meiotic development and viable pollens. Great blocks of heterochromatin were observed around the centromers. DAPI staining was positive for centroeric heterochroatin, hile CMA3 ark as observed just at terinal regions of one pair of...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Chromosome number; Heterochromatin pattern; Heteropterys umbellata; Malpighiaceae; Meiosis; Pollen viability.
Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652010000400009
Imagem não selecionada

Imprime registro no formato completo
Bud development, flowering and fruit set of Moringa oleifera Lam. (Horseradish Tree) as affected by various irrigation levels JARTS
Muhl, Quintin Ernst; du Toit, Elsa S.; Steyn, Joachim Martin; Apostolides, Zeno.
Moringa oleifera is becoming increasingly popular as an industrial crop due to its multitude of useful attributes as water purifier, nutritional supplement and biofuel feedstock. Given its tolerance to sub-optimal growing conditions, most of the current and anticipated cultivation areas are in medium to low rainfall areas. This study aimed to assess the effect of various irrigation levels on floral initiation, flowering and fruit set. Three treatments namely, a 900 mm (900IT), 600 mm (600IT) and 300 mm (300IT) per annum irrigation treatment were administered through drip irrigation, simulating three total annual rainfall amounts. Individual inflorescences from each treatment were tagged during floral initiation and monitored throughout until fruit set....
Tipo: Info:eu-repo/semantics/article Palavras-chave: Horticulture; Agronomy; Plant Science floral initiation; Pollen viability; Pollen tube growth; Biofuel; Miracle tree; Moringa oleifera.
Ano: 2014 URL: http://www.jarts.info/index.php/jarts/article/view/2013081343310
Imagem não selecionada

Imprime registro no formato completo
Chromosome number, microsporogenesis, microgametogenesis, and pollen viability in the Brazilian native grass Mesosetum chaseae (Poaceae). Repositório Alice
SILVA, L. A. C.; PAGLIARINI, M. S.; SANTOS, S. A.; SILVA, N.; SOUZA, V. F..
The genus Mesosetum is a primarily South American genus with 42 species. Mesosetum chaseae, regionally known as ?grama-do-cerrado?, is abundant in the Pantanal Matogrossense (Brazil); it is a valuable resource for livestock and for environmental conservation. We collected specimens from the Nhecolandia sub-region of the Brazilian Pantanal, located in Corumbá, Mato Grosso do Sul, Brazil. We examined chromosome number, ploidy level, meiotic behavior, microgametogenesis, and pollen viability of 10 accessions. All the accessions were diploid, derived from x = 8, presenting 2n = 2x = 16 chromosomes. Chromosomes paired as bivalents showing, predominantly, two terminal chiasmata. Interstitial chiasmata were rare. Meiosis was quite normal producing only a few...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Mesosetum chaseae; 'Grama-do-cerrado'; Meiosis; Chromosome number; Microgametogenesis; Pollen viability.
Ano: 2012 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/941635
Imagem não selecionada

Imprime registro no formato completo
Combining capacity and heterosis in eggplant hybrids under high temperatures Horticultura Brasileira
Valadares,Ricardo de N; A Nóbrega,Danieli; Lima,Lilian B de; Silva,Jordana Antônia dos S; Santos,Ana Maria M dos; Melo,Roberto de A; Menezes,Dimas.
ABSTRACT The objective of this work was to estimate the combinatorial capacity and heterosis of eggplant hybrids under high temperature conditions. Seven genitors, twelve hybrid combinations, originated from a partial diallel, and the Ciça F1 hybrid, as control, were evaluated. The experiment was conducted under greenhouse conditions in randomized block design with four replications, from April to December 2017. The assessed traits related to high temperatures were pollen viability (PV) and fruit fixation index (FFI); the morphoagronomic traits were number of fruits per plant (NFP), fruit weight (FWe), production per plant (PP), fruit length (FL), fruit width (FWi), fruit length/width ratio (FLWR) and plant height (PH). The variance analysis showed...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Solanum melongena; Partial diallel; Fixation index of fruits; Pollen viability; Productivity.
Ano: 2019 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-05362019000300348
Imagem não selecionada

Imprime registro no formato completo
Comparative pollination role of stamens and breeding system in three species of Commelina (Commelinaceae) in Ile-Ife, Nigeria Acta Botanica
Oziegbe,Matthew; Akinlua,Isaiah Opeyemi; Olalekan,Adebiyi Abdul-hakeem.
This study investigated pollination mechanisms and breeding systems in five Commelina variants: two subspecies of Commelina diffusa (C. diffusa subsp. aquatica and C. diffusa subsp. montana, each having two staminodes); two variants of C. erecta (with three staminodes); and C. lagosensis (also with three staminodes). In all three species, the staminodes have six lobes but only two fertile lateral lobes. We collected field samples and cultivated new plants from stem cuttings. When the plants flowered, we evaluated floral morphology, floral biology and breeding systems, creating eight separate experimental treatments, involving spontaneous and hand pollination, as well as varying degrees of emasculation of the flowers. Although the pollen from the lateral...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Commelina; Pollen viability; Stamen type; Autogamy.
Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062013000300012
Imagem não selecionada

Imprime registro no formato completo
Cytogenetic evaluation of chili ( Capsicum spp ., Solanaceae) genotypes cultivated in Valle del Cauca, Colombia Acta Agron. (Palmira)
Souza-Macedo,Viviane de; García-Dávila,Mario Augusto; Castro,Gisele Renata de; Garzón-Bautista,Yuri Marcela; Caetano,Creucí Maria.
Abstract The genus Capsicum comprises a large group of hot and sweet peppers, with different morphological varieties and degree of fruits pungency. Due to its active principles is widely used in cooking and in traditional medicine, being sold in large worldwide. In order to provide cytogenetic information which supporting plant breeding programs, this study aimed to analyze the meiotic behavior, chromosome number and pollen viability of the three species of greater economic importance of Capsicum (C. annuum, C. frutescens and C. chinense). Therefore, fruits and flower buds were collected from the Experimental Center of the Universidad Nacional de Colombia, campus Palmira- CEUNP to the corresponding mitotic, meiosis and pollen viability analysis. Plants...
Tipo: Journal article Palavras-chave: Chromosome number; Meiotic behavior; Meiotic index; Plant genetic resources conservation; Ploidy level; Pollen viability.
Ano: 2017 URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-28122017000400612
Imagem não selecionada

Imprime registro no formato completo
Cytogenetic studies in some species of Passiflora L. (Passifloraceae): a review emphasizing Brazilian species BABT
Souza,Margarete Magalhães; Pereira,Telma N. Santana; Vieira,Maria Lúcia Carneiro.
The Passifloraceae is represented by species of tropical and subtropical origin. The Passiflora is the richest genus with approximately 450 species, 200 of them being native to Brazil. Recent karyological studies have reported the basic chromosome number for the Passiflora genus as x = 6, whereas x = 9, x = 10 and x = 12 were established as secondary basic numbers. High rates of fertility occur in most Passiflora species, since both meiotic index and pollen viability are above 90%. Unusual meiotic behavior has been described in some taxa. Unviable pollen were observed in some diploids species. The genome size varies from 1.83 to 5.36 pg, and significant interspecific variance has been observed. Studies using the FISH methodology have shown that there are...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Karyotype; Banding; Meiotic behavior; Pollen viability; Nuclear DNA content; FISH.
Ano: 2008 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132008000200003
Imagem não selecionada

Imprime registro no formato completo
Cytological and genome size data analyzed in a phylogenetic frame: Evolutionary implications concerning Sisyrinchium taxa (Iridaceae: Iridoideae) Genet. Mol. Biol.
Burchardt,Paula; Souza-Chies,Tatiana T.; Chauveau,Olivier; Callegari-Jacques,Sidia M.; Brisolara-Corrêa,Lauís; Inácio,Camila Dellanhese; Eggers,Lilian; Siljak-Yakovlev,Sonja; de Campos,José Marcello Salabert; Kaltchuk-Santos,Eliane.
Abstract Sisyrinchium is the largest genus of Iridaceae in the Americas and has the greatest amount of cytological data available. This study aimed at investigating how genomes evolved in this genus. Chromosome number, genome size and altitude from species of sect. Viperella were analyzed in a phylogenetic context. Meiotic and pollen analyses were performed to assess reproductive success of natural populations, especially from those polyploid taxa. Character optimizations revealed that the common ancestor of sect. Viperella was probably diploid (2n = 2x =18) with two subsequent polyplodization events. Total DNA content (2C) varied considerably across the phylogeny with larger genomes detected mainly in polyploid species. Altitude also varied across the...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Ancestral chromosome number; DNA content; Meiotic behavior; Pollen viability; Polyploidy.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572018000200288
Imagem não selecionada

Imprime registro no formato completo
Determination of cardinal temperatures for sugar apple ( Annona squamosa L.) Ciência e Agrotecnologia
Rodrigues,Bruno Rafael Alves; Santos,Rayane Carneiro dos; Nietsche,Silvia; Mercadante-Simões,Maria Olívia; Cunha,Isabella Renata Gomes da; Pereira,Marlon Cristian Toledo.
ABSTRACT The sugar apple is highly dependent on the pollination and fruit tree pollen performance is crucial for successful fertilization and fruit set. The objective of this study was to determine the cardinal temperatures for in vitro pollen grains germination and evaluate the effect of temperature on pollen tube growth of sugar apple. The experimental design was in a completely randomized with eight treatments (10, 15, 20, 25, 30, 35, 40 and 45 ºC), four replicates and each plot was constituted by two slides per parcel. The cardinal temperatures were determined by evaluating in vitro germination of pollen grains and pollen tube growth in standard culture medium. It also assessed the pollen tube growth and the percentage of germination in vitro depending...
Tipo: Info:eu-repo/semantics/article Palavras-chave: In vitro germination; Pollen viability; Monads; Tetrads; Pollen tube.
Ano: 2016 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542016000200145
Imagem não selecionada

Imprime registro no formato completo
Floral and reproductive biology of Alcantarea nahoumii (Bromeliaceae), a vulnerable endemic species of the Atlantic Forest Acta Botanica
Bastos,Maria Josirene Souza Moreira; Bastos,Lucimário Pereira; Souza,Everton Hilo de; Soares,Taliane Leila; Morais,Daniel Vieira; Souza,Fernanda Vidigal Duarte de; Costa,Maria Angélica Pereira de Carvalho.
ABSTRACT Alcantarea nahoumii occurs exclusively in the state of Bahia, Brazil, and is classified as vulnerable due to deforestation and frequent fires in the region. Knowledge of floral and reproductive biology is fundamental to understanding ecological interactions, as well as the reproductive success of plant species. The objective of this study was to evaluate the floral and reproductive biology of A. nahoumii in an Atlantic Forest fragment with regard to phenology, pollen viability, stigma receptivity, pollination ecology and reproductive systems, all of which are important parameters for of the development of conservation strategies for the species. Anthesis is diurnal and heterogeneous, starting at 6:30 a.m. and lasting until 8:00 a.m. Highest...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Bromeliaceae; Floral visitors; Nectar; Pollen viability; Reproductive systems; Stigma receptivity.
Ano: 2017 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062017000400665
Imagem não selecionada

Imprime registro no formato completo
Genetic and ecological niche modeling of Calydorea crocoides (Iridaceae): an endemic species of Subtropical Highland Grasslands Genet. Mol. Biol.
de Alencar,Juliana Lustosa Matos; Kaltchuk-Santos,Eliane; Fachinetto,Juliana; Tacuatiá,Luana Olinda; Forni-Martins,Eliana Regina; Stiehl-Alves,Eudes Maria; de Souza-Chies,Tatiana Teixeira.
Abstract Evolutionary analyses have been widely used for evaluation of genetic diversity of natural populations and correlate these data to the fitness of the species, especially in the case of threatened species. Calydorea crocoides occurs in a restricted area at altitudes from 800 to 1500 m in southern Brazil and is considered endangered. A study assessing genetic diversity, cytogenetic features and ecological niche was performed aiming to characterize C. crocoides by multidisciplinary approaches. Molecular data highlighted that most of the total variation (76%; p < 0.001) was found within populations and the parameters of genetic diversity were high at the species level (PPB = 98.97%; I = 0.4319; h = 0.2821). Gene flow (Nm) was estimated in 0.97...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Genetic differentiation; ISSR markers; Pollen viability; Cytogenetic analyses; Restricted distributed species.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572018000200327
Imagem não selecionada

Imprime registro no formato completo
"In vitro" pollen germination of Hevea camargoana. Repositório Alice
GONÇALVES, P. de S.; PAIVA, J. R. de; REBELLO, A. P..
A study of pollen viability was carried out aiming to obtain the best medium concentration for pollen germination. Different concentrations of sucrose, glucose, galactose, lactose and mannitol in distilled water with and without boric acid were tested as media for germination of pollen of Hevea camargoana in the laboratory. Twenty percent sucrose with 0.01% boric acid at 20 to 30 Graus C. gave the best results. Tube lengths of 74.78 um were obtained. Pollen tubes emerged within 30 minutes and completed full growth within six hours. Adding 0.01% boric acid increased the percentage germination markedly in all media excep in mannitol.
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Rubber tree; Pollen viability; Sugar medium concentration; Pollem length; Hevea Brasiliensis; Seringueira; Tubo Polínico.
Ano: 1982 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1107135
Imagem não selecionada

Imprime registro no formato completo
Influence of high temperature on the reproductive biology of dry edible bean (Phaseolus vulgaris L.) Scientia Agricola
Silva,Daiana Alves da; Pinto-Maglio,Cecília Alzira Ferreira; Oliveira,Érica Cristina de; Reis,Raquel Luiza de Moura dos; Carbonell,Sérgio Augusto Morais; Chiorato,Alisson Fernando.
ABSTRACT: The aim of this study was to investigate the effect of heat stress on 12 bean genotypes through the analysis of their reproductive biology in terms of flowering, pollen viability, meiotic behavior, and production. Plants were grown in a climate chamber at 25-20 °C (day and night) and at a high temperature treatment 37-26 °C (day and night) from the vegetative (V4) development stage to physiological maturity. The experimental design was 2 × 12 factorial arrangement with six replications and the factors consisted of heat treatments and genotypes. In three replications, the number of newly opened flowers was checked daily. At physiological maturity, the following traits were evaluated: percentage of pod set, number of pods, number of viable seeds,...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Common bean; Heat stress; Pollen viability; Meiosis; Seed yield.
Ano: 2020 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162020000301100
Imagem não selecionada

Imprime registro no formato completo
Meiotic analysis of the germoplasm of three medicinal species from Asteraceae family Ciência Rural
Olkoski,Denise; Laughinghouse,Haywood Dail; Silva,Antonio Carlos Ferreira da; Tedesco,Solange Bosio.
Cytogenetic characterization was carried out on 12 accessions from Aster squamatus (Spreng.) Hieron., Pterocaulon polystachyum DC, and Solidago microglossa DC by studying their meiotic behavior and pollen viability. These species are from the Asteraceae family, native to Rio Grande do Sul State, Brazil, and are important for medicinal use. Young inflorescences with four accessions of each species were collected, fixed in ethanol-acetic acid (3:1), and conserved in ethanol 70% until use. The method used was that of squashing the anthers and coloring with acetic orcein 2%. Meiosis was regular in all accessions, presenting chromosomal associations preferentially bivalent, where n=10 was found for Aster squamatus and n=9 for Pterocaulon polystachyum, and...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Asteraceae; Meiotic behavior; Pollen viability.
Ano: 2008 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782008000600047
Imagem não selecionada

Imprime registro no formato completo
New hybrids from peanut (Arachis hypogaea L.) and synthetic amphidiploid crosses show promise in increasing pest and disease tolerance. Repositório Alice
FAVERO, A. P.; PADUA, J. G.; COSTA, T. S.; GIMENES, M. A.; GODOY, I. J.; MORETZSOHN, M. C.; MICHELOTTO, M. D..
2015
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Interspecific hybrid; Characterization; Pollen viability; Wild species; Germplasm; Groundnut.
Ano: 2015 URL: http://www.alice.cnptia.embrapa.br/handle/doc/1032023
Imagem não selecionada

Imprime registro no formato completo
New hybrids from peanut (Arachis hypogaea L.) and synthetic amphidiploid crosses show promise in increasing pest and disease tolerance. Repositório Alice
FAVERO, A. P.; PADUA, J. G.; COSTA, T. S.; GIMENES, M. A.; GODOY, I. J.; MORETZSOHN, M. de C.; MICHELOTTO, M. D..
2015
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Interspecific hybrid; Germplasm; Characterization; Pollen viability; Groundnut.
Ano: 2015 URL: http://www.alice.cnptia.embrapa.br/handle/doc/1034692
Registros recuperados: 33
Primeira ... 12 ... Última
 

Empresa Brasileira de Pesquisa Agropecuária - Embrapa
Todos os direitos reservados, conforme Lei n° 9.610
Política de Privacidade
Área restrita

Embrapa
Parque Estação Biológica - PqEB s/n°
Brasília, DF - Brasil - CEP 70770-901
Fone: (61) 3448-4433 - Fax: (61) 3448-4890 / 3448-4891 SAC: https://www.embrapa.br/fale-conosco

Valid HTML 4.01 Transitional