|
|
|
| Registros recuperados: 23 | |
|
| |
|
| |
|
|
| 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 |
| |
|
|
| 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 |
| |
|
|
| Budeguer,C.J; Camadro,E.L; Erazzú,L.E. |
| Stevia rebaudiana (Bertoni) Bertoni (2n=2x=22) (Asteraceae family) is a species of economic value due to the presence of steviol glycosides in leaves -mainly stevioside and rebaudioside A- which are non-caloric sugars. In 2013, a collection of plants (genotypes) from four contrasting environments was established in Tucuman, Argentina, for evaluation under local conditions and, eventually, breeding purposes. As a first step, pollen viability and meiosis was studied in a sample of 56 plants. The percentage of pollen viability varied from medium (69.4%) to high (99.6%) in 52 of them, but from low (36.5%) to relatively low (51.5%) in the remaining four. The latter four plants also presented pollen grains of heterogeneous size, which were classified as n... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Stevia; Pollen viability; Meiosis; Sporads. |
| Ano: 2018 |
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1852-62332018000200005 |
| |
|
|
| 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 |
| |
|
| |
|
|
| Zambon,Carolina Ruiz; Silva,Luiz Fernando de Oliveira da; Pio,Rafael; Bianchini,Flávio Gabriel; Oliveira,Adelson Francisco de. |
| ABSTRACT In order to ensure success in controlled hybridizations in olive tree cultivation, the information on pollen viability and stigma receptivity is essential. The aim was to establish methodologies that increase the preservation of pollen viability and to establish the time to perform crossbreeds in hybridization studies with olive trees. Three experiments were performed with plants from the cultivar Arbequina, in Maria da Fé, MG, Brazil. In the first experiment, the description of the flower events was performed. In the second, anthers were desiccated in eppendorfs, being stored at three different conditions for pollen viability test: room temperature (27 ºC), refrigerator (8 ºC) and freezer (-10 ºC). In order to evaluate the in vitro germination,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Olea europaea L.; Pollen viability; Pollen grains; Hybridization. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902018000200291 |
| |
|
|
| Bender,Renar João; Santos,Rinaldo Pires dos; Guerra,Divanilde; Schwarz,Sergio Francisco; Bender,Stefan da Silveira. |
| ABSTRACT: Seedlessness in fruit is a trait that is much sought after by juice making industries. Close to the city of São Sebastião do Caí, in the state of Rio Grande do Sul (RS), Brazil, a new mutant orange originating from natural mutation was identified and selected as a seedless material. To determine the mechanisms involved in the absence of seeds, the reproductive structures of this new mutant by comparison with a Valencia sweet orange as control, a cultivar with a profusion of seeds, was analyzed in terms of meiotic behavior, meiotic index, pollen viability, in vitro germination, and ovule features to determine the grounds for seed absence. Other morphological analyzes allowed for visualizing the structures of normal appearance and size in both... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Cytogenetic analysis; Embryo sac abortion; Female sterility; Meiotic analysis; Pollen viability. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162017000500371 |
| |
|
|
| 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 |
| |
|
|
| 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: Info:eu-repo/semantics/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 |
| |
|
|
| 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 |
| |
|
| |
|
|
| 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 |
| |
|
| |
|
| |
|
|
| 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 |
| |
|
| |
|
|
| 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 |
| |
|
| |
| Registros recuperados: 23 | |
|
|
|
