SABIIA - Sistema Aberto e Integrado de Informação em Agricultura (Sabiia)

MENDONÇA, S. A.; BARRIOS, S. C. L.; FIGUEIREDO, U. J. de; ALVES, G. F.; VALLE, C. B. do.

2013

Apomixis: exploiting hybrid vigor in rice

Palavras-chave: Hybrids; Apomixis; Selection; Forage breeding; Signalgrass.

Ano: 2013

URL: http://www.alice.cnptia.embrapa.br/handle/doc/974483

International Rice Research Institute

Khush, G.S..

78 p. : ill.

Tipo: Book

Palavras-chave: Apomixis; Hybrid rice.

Ano: 1994

URL: http://hdl.handle.net/10269/213

BbrizAGL6 is differentially expressed during embryo sac formation of apomictic and sexual Brachiaria brizantha plants.

GUIMARÃES, L. A.; DUSI, D. M. de A.; MASIERO, S.; RESENTINI, F.; GOMES, A. C. M. M.; SILVEIRA, E. D.; FLORENTINO, L. H.; RODRIGUES, J. C. M.; COLOMBO, L.; CARNEIRO, V. T. de C..

bitstream/item/156132/1/art3A10.10072Fs11105-013-0618-8.pdf

Biometrical analysis and selection of tetraploid progenies of Panicum maximum using mixed model methods.

Palavras-chave: MADS-box; Monocot; Reprodução vegetal; Brachiaria; Arabidopsis; Apomixis.

Ano: 2013

URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/974856

RESENDE, R.M.S.; JANK, L., VALLE, C.B. do; BONATO, A.L.V..

The objectives of this work were to estimate the genetic and phenotypic parameters and to predict the genetic and genotypic values of the selection candidates obtained from intraspecific crosses in Panicum maximum as well as the performance of the hybrid progeny of the existing and projected crosses. Seventy-nine intraspecific hybrids obtained from artificial crosses among five apomictic and three sexual autotetraploid individuals were evaluated in a clonal test with two replications and ten plants per plot. Green matter yield, total and leaf dry matter yields and leaf percentage were evaluated in five cuts per year during three years. Genetic parameters were estimated and breeding and genotypic values were predicted using the restricted maximum...

Biometrical analysis and selection of tetraploid progenies of Panicum maximum using mixed model methods

Palavras-chave: Guineagrass; Apomixis; Breeding; Heritability; Repeatability; Selection of parents; Capim colonião; Apomixia; Melhoramento; Herdabilidade; Repetibilidade; Seleção de genitores.

Ano: 2004

URL: http://www.alice.cnptia.embrapa.br/handle/doc/110284

PAB

Resende,Rosangela Maria Simeão; Jank,Liana; Valle,Cacilda Borges do; Bonato,Ana Lídia Variani.

Tipo: Info:eu-repo/semantics/report

Palavras-chave: Guineagrass; Apomixis; Breeding; Heritability; Repeatability; Selection of parents.

Ano: 2004

URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2004000400006

Brachiaria decumbens intraspecific hybrids: characterization and selection for seed production.

MONTEIRO, L. C.; VERZIGNASSI, J. R.; BARRIOS, S. C. L.; VALLE, C. B. do; FERNANDES, C. D.; BENTEO, G. L.; LIBÓRIO, C. B..

Brachiaria decumbens has great importance in the national beef cattle scenario due to its high forage yield potential and high adaptability to acid soils and low fertility. In order to obtain new cultivars, intraspecific hybrids, previously selected by the Brachiaria breeding program, were evaluated in 2013 and 2014 for phenological characteristics and seed production potential through their production components, aiming to obtain cultivars with satisfactory production agronomic characteristics and forage yield, resistant to ?cigarrinhas-das-pastagens? (Tomaspia sp.) and good seed production. Estimates of phenotypic correlation and analysis of variance were performed using the SAS 9.3 software. From the results obtained in both consecutive years, it was...

BRS Ipyporã ("belo começo" em guarani): híbrido de Brachiaria da Embrapa.

Palavras-chave: Genotypes; Forage improvement; Apomixia; Melhoramento de forrageira; Fenologia; Genótipo; Phenology; Apomixis.

Ano: 2016

URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1087913

Infoteca-e

VALLE, C. B. do; EUCLIDES, V. P. B.; MONTAGNER, D. B.; VALERIO, J. R.; MENDES-BONATTO, A. B.; VERZIGNASSI, J. R.; TORRES, F. Z. V.; MACEDO, M. C. M.; FERNANDES, C. D.; BARRIOS, S. C. L.; DIAS FILHO, M. B.; MACHADO, L. A. Z.; ZIMMER, A. H..

O híbrido BRS RB331 Ipyporã é resultado de um cruzamento entre B. ruziziensis e B. brizantha realizado em 1992, na Embrapa Gado de Corte e liberado pela Embrapa em 2017 em parceria com a UNIPASTO, após 13 anos intermitentes de avaliações. É uma planta de porte baixo, prostrado, com colmos delgados de bainhas muito pilosas e folhas pilosas em ambas as faces. As espiguetas são uniseriadas e com pouca ou nenhuma pilosidade. A BRS Ipyporã entra no mercado para suprir a demanda por uma cultivar de Brachiaria de boa produtividade e manejo relativamente fácil, como a cv. Marandu, porém com elevado grau de resistência à cigarrinha da cana do gênero Mahanarva, além de apresentar resistência às cigarrinhas típicas de pastagem dos gêneros Deois e Notozulia,...

Tipo: Comunicado Técnico (INFOTECA-E)

Palavras-chave: Apomixia; Desempenho animal; Híbrido interespecífico; Brachiaria brizantha; Cigarrinha; Valor nutritivo; Semente; Urochloa brizantha; Cercopidae; Apomixis; Animal performance; Interspecific hybridization; Seeds; Nutritive value.

Ano: 2017

URL: http://www.infoteca.cnptia.embrapa.br/handle/doc/1069732

Coexpression and transcriptome analyses identify active apomixis-related genes in Paspalum notatum leaves.

OLIVEIRA, F. A. de; VIGNA, B. B. Z.; SILVA, C. C. da; FAVERO, A. P.; MATTA, F. de P.; AZEVEDO, A. L. S.; SOUZA, A. P. de.

RNA sequencing (RNA-seq) is the most effective method for simultaneously predicting new transcripts and identifying differentially expressed genes among distinct tissues, genotypes, abiotic conditions and developmental stages [1]. Conversely, considering the large amount of data generated from RNA-seq, new approaches that efficiently extract meaningful associations from highly multivariate datasets are needed [2]. Transcriptome coexpression studies can show how complex phenotypes depend on the activity of coordinated batteries of genes [3]. Therefore, the construction of coexpression networks based on gene expression data using correlation metrics provides valuable information regarding alterations in biological systems in response to differential gene...

Combining ability among apomictic and sexual parents of Urochloa humidicola.

Palavras-chave: Differential expression; Gene coexpression network; RNA sequencing; Apomixis; Paspalum.

Ano: 2020

URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1121557

FIGUEIREDO, U. J. de; BARRIOS, S. C. L.; VALLE, C. B. do; NUNES, J. A. R..

The diallel cross constitutes an informative genetic design for choosing genitors and crosses in breeding programmes since it provides estimates of general (GCA) and specific (SCA) combining abilities. Because the breeding programme for Urochloa humidicola ([Rendle] Morrone & Zuloaga; syn. Brachiaria humidicola [Rendle] Schweick) at Embrapa Beef Cattle is recent, these estimates are still unknown. Thus, the aim of this study was to obtain the estimates of GCA and SCA from the partial diallel cross design between sexual and apomictic parents. The crosses involved nine sexual and ten apomictic parents. Seventy‐one full‐sib progenies were obtained and evaluated in an incomplete block design, using all parents and the cv. BRS Tupi as a...

Cytogenetic data for Paspalum notatum Flügge accessions

Palavras-chave: BLUP; Partial diallel; Brachiaria Humidicola; Apomixis; Hybrids.

Ano: 2019

URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1117791

Scientia Agricola

Dahmer,Nair; Schifino-Wittmann,Maria Teresa; Dall'Agnol,Miguel; Castro,Biane de.

Several species of the genus Paspalum L. are important forages, due their to quality, productivity and tolerance to environmental stresses. Chromosome numbers, meiotic configurations and pollen fertility were evaluated in a collection of 85 accessions of Paspalum notatum Flügge and in seven accessions of Pensacola (P. notatum var saurae). All P. notatum accessions were tetraploid, with 2n = 4x = 40, except one diploid accession, considered as an escape of Pensacola. All Pensacola plants had 2n = 2x = 20. Meiotic configurations at diakinesis and metaphase I varied among tetraploid accessions, from plants with only bivalents to plants with high frequency of quadrivalents. Pollen fertility varied from 82.5 to 95.9% among diploid accessions and from 72.4 to...

Cytogenetics and embryology of Eupatorium laevigatum (Compositae)

Palavras-chave: Apomixis; Chromosome numbers; Meiotic configurations; Plant breeding; Pollen fertility.

Ano: 2008

URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162008000400009

Genet. Mol. Biol.

Bertasso-Borges,Maristela Sanches; Coleman,James Robert.

Embryological studies indicate Eupatorium laevigatum to have Antennaria type diplospory with precocious embryony. The embryo sac is of the Polygonum type and the polar nuclei fuse before anthesis (maturation of the stamens). Endosperm development is autonomous and the central cell divides only after the initial stages of embryo formation. It is estimated that about 10% of the florets in anthesis contain an undivided egg which can be used for sexual reproduction. The study of microsporogenesis revealed abnormalities in chromosome pairing which result in the formation of univalents, bivalents, trivalents and higher polyvalents, with the consequent production of lagging chromosomes, unbalanced nuclei, micronuclei and sterile pollen. We found that, as...

Determination of the mode of reproduction of bahiagrass hybrids using cytoembryological analysis and molecular markers

Palavras-chave: Eupatorium; Apomixis; Plant cytogenetics; Plant embryology; Asteraceae.

Ano: 2005

URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572005000100022

R. Bras. Zootec.

Weiler,Roberto Luis; Dall’Agnol,Miguel; Simioni,Carine; Krycki,Karine Cristina; Dahmer,Nair; Guerra,Divanilde.

ABSTRACT The aim of this study was to determine the mode of reproduction of a hybrid progeny derived from intraspecific crosses of Paspalum notatum through cytoembryological analysis and use of RAPD (random amplification of polymorphic DNA) molecular markers. Cytoembryological analysis allowed identification of the mode of reproduction of 28 plants that were selected after agronomic productivity evaluations. Of these, 19 had embryo sac morphology compatible with an apomictic mode of reproduction and nine had embryo sac morphology compatible with a sexual mode of reproduction. Meanwhile, molecular marker analysis for 194 individuals showed 54 sexual and 140 apomictic plants; of the 28 plants analyzed by the two methods, ten results (35.7%) were in...

Ecological setup, ploidy diversity, and reproductive biology of Paspalum modestum, a promising wetland forage grass from South America

Palavras-chave: Apomixis; Molecular analysis; Paspalum notatum; Plant breeding; RAPD.

Ano: 2017

URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982017000300185

Genet. Mol. Biol.

Karunarathne,Piyal; Feduzka,Cristian; Diego,Hojsgaard.

Abstract With ever-rising demand for food, forage breeding for intensification of cattle production is also taking a leap. In South America, cattle production systems are displaced to marginal areas poorly exploited with cultivated pastures yet with high potential for growing stocking rates. This places the need for using native genetic resources to breed locally adapted plant genotypes that benefits from better forage quality, yield, and lesser threat to the local biodiversity. Paspalum modestum Mez is a grass species that produces quality forage and grows in marginal areas like estuaries and floodplains, suitable for introduction in breeding programs. In this study we characterize the species' reproductive biology and ecological preferences needed...

Epigenetic aspects of sexual and asexual seed development.

Palavras-chave: Apomixis; Ecological niche; Plant breeding; Polyploidy; Sexuality.

Ano: 2020

URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572020000300304

RODRIGUES, J. C. M.; KOLTUNOW, A. M. G..

bitstream/item/178121/1/ID-27889-1.pdf

Estudios en el género Cortaderia (Poaceae): I. Sistemática y nomenclatura de la sect. Cortaderia

Palavras-chave: Sementes; Desenvolvimento; Reprodução Assexuada; Apomixis; Epigenetics; Seed development.

Ano: 2005

URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/188345

Darwiniana

Testoni,Daniel; Villamil,Carlos B..

El género Cortaderia (Poaceae) incluye 19 especies sudamericanas separadas en cuatro secciones. En este trabajo se estudian las especies incluidas en la sect. Cortaderia. Cortaderia rudiuscula y C. jubata son dos nombres utilizados con diferentes criterios según diferentes autores, lo que ha generado confusión y explica los numerosos ejemplares de herbario determinados sucesivamente como diferentes especies de la sección. La descripción original de C. rudiuscula fue realizada sobre la base de cuatro sintipos que corresponden a más de una especie. En esta contribución se analizaron los ejemplares tipo y otros materiales de herbario identificados como C. rudiuscula, además de plantas coleccionadas en muestreos poblacionales para este trabajo, y ejemplares de...

URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0011-67932014000200007

Palavras-chave: Análisis multivariado; Apomixis; Cortaderia; Ginodioecia; Poaceae; Sistemática.

Ano: 2014

Evaluation of an apomictic genotype of Brachiaria brizantha leading to cultivar release and protection.

Expressed sequence-tag analysis of ovaries of Brachiaria brizantha reveals genes associated with the early steps of embryo sac differentiation of apomictic plants.

VALLE, C. B. do; EUCLIDES, V. P. B.; VALÉRIO, J. R.; MACEDO, M. C. M.; CHIARI, L.; PAGLIARINI, M. S.; JANK, L.; RESENDE, R. M. S.; DIAS-FILHO, M. B..

The evaluation progress leading to cultivar development of a forage grass is a long-term investment, which requires a multidisciplinary team.

Tipo: Resumo em anais de congresso (ALICE)

Palavras-chave: Pastagem; Planta forrageira; Gramínea forrageira; Braquiária; Brachiaria brizantha; Melhoramento genético vegetal; Reprodução; Apomixia; Piatã; Brasil; Pastures; Feed crops; Feed grasses; Plant breeding; Reproduction; Apomixis; Brazil..

Ano: 2008

URL: http://www.alice.cnptia.embrapa.br/handle/doc/907359

SILVEIRA, E. D.; GUIMARÃES, L. A.; DUSI, D. M. de A.; SILVA, F. R. da; MARTINS, N. F.; COSTA, M. M. do C.; ALVES-FERREIRA, M.; CARNEIRO, V. T. de C..

Abstract - In apomixis, asexual mode of plant reproduction through seeds, an unreduced megagametophyte is formed due to circumvented or altered meiosis. The embryo develops autonomously from the unreduced egg cell, independently of fertilization. Brachiaria is a genus of tropical forage grasses that reproduces sexually or by apomixis. A limited number of studies have reported the sequencing of apomixis-related genes and a few Brachiaria sequences have been deposited at genebank databases. This work shows sequencing and expression analyses of expressed sequence-tags (ESTs) of Brachiaria genus and points to transcripts from ovaries with preferential expression at megasporogenesis in apomictic plants. From the 11 differentially expressed sequences from...

Forage characters of different Paspalum species in Rio Grande do Sul: a meta-analysis

Palavras-chave: Forage grass; Apomixis; Plant reproduction.

Ano: 2012

URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/938024

Ciência Rural

Graminho,Larissa Arnhold; Dall’Agnol,Miguel; Pötter,Luciana; Lopes,Rodrigo Ramos; Simioni,Carine; Weiler,Roberto Luís.

ABSTRACT: The objective of this study was to evaluate, through meta-analysis, the forage characteristics of various species of the genus Paspalum and to use them to select the best ecotypes that can be used in artificial hybridization as parents and hybrids for pasture production and natural pasture recovery systems. Data were obtained from studies conducted by the Department of Forage Plants and Agrometeorology of the Universidade Federal do Rio Grande do Sul. Database comprised tests conducted with ecotypes and/or hybrids of Paspalum spp. in plots for evaluating total dry mass production, leaf dry mass production, and stem dry mass production by means of cuts. Total dry mass production, which included leaves and stems, differed between the ecotypes and...

Forage performance of Paspalum hybrids from an interspecific cross

Palavras-chave: Apomixis; Hybridization; Plant breeding; Natural pasture; Variability.

Ano: 2017

URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782017000700651

Ciência Rural

Motta,Eder Alexandre Minski da; Dall'Agnol,Miguel; Nascimento,Felipe Link; Pereira,Emerson André; Machado,Juliana Medianeira; Barbosa,Marlon Risso; Simioni,Carine; Ferreira,Priscila Becker.

ABSTRACT: The goal of this study was to assess the variability of Paspalum plicatulum x P. guenoarum interspecific hybrids in terms of agronomic performance and their tolerance to cold conditions, as well as to estimate the correlation of different phenotypic characters associated with forage production. Twenty hybrids plants were used, besides one access P. guenoarum , one of P. plicatulum and the cultivar 'Pensacola' ( P. notatum ). Assessments were performed on individual plants, in a completely randomized design with five repetitions. Paspalum genotypes presented variability in total dry matter, leaf dry mass, leaf: stem ratio, and tolerance to cold. We suggest selection of the hybrids 08Q01 and 08Q44 for new stages within a forage improvement...

From anthesis to diaspore dispersal: reproductive mechanisms of rare herbaceous moraceae species endemic to Brazil

Palavras-chave: Apomixis; Native grasses; Hybridization.

Ano: 2016

URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782016000601025

Darwiniana

Márcia de Araújo,Luzia; Valentin-Silva,Adriano; Fernandes,Geraldo W; Vieira,Milene F.

Studies on the reproductive biology of Dorstenia species are scarce. We analyzed the sexuality, floral biology, and diaspore dispersal of Dorstenia arifolia and D. bonijesu, including their breeding systems and pollinators, in natural populations from Minas Gerais state, southeastern Brazil. We report here, for the first time, the occurrence of both unisexual (male) and bisexual coenanthia on the same individuals of Dorstenia arifolia, while only bisexual coenanthia were observed in D. bonijesu. In both species all coenanthia were long-lived and bisexual coenanthia were protogynous. We observed the occurrence of self-compatibility and myophily in Dorstenia arifolia, a species which was pollinated by small Lauxaniidae flies. Those insects not only used...