Results 61 to 70 of about 1,577 (179)

Reproductive studies on ipecac (Cephaelis ipecacuanha (Brot.) A. Rich; Rubiaceae): meiotic behavior and pollen viability

Brazilian Journal of Biology
Reproductive studies were carried out on Brazilian accessions of ipecac, Cephaelis ipecacuanha. Meiotic behavior was studied using the squashing technique.
M. M. Souza, E. R. Martins, T. N. S. Pereira, L. O. Oliveira   +3 more
doaj   +1 more source

Reproductive studies in ipecac (Psychotria ipecacuanha (Brot.) stockes; Rubiaceae): pollen development and morphology

Brazilian Archives of Biology and Technology, 2008
The aim of this work was to carry out the reproductive studies on Brazilian accessions of ipecac, Psychotria ipecacuanha. It presented heterostyly, with brevistylous and longistylous flowers.
Margarete Magalhães Souza, Ernane Ronie Martins, Telma Nair Santana Pereira, Luiz Orlando de Oliveira   +3 more
doaj   +1 more source

Aperture Pattern and Microsporogenesis in Asparagales

Aliso, 2006
The aperture pattern of pollen grains is a character defined as the number, shape, and position of apertures. Although this character is highly variable in angiosperms, two states are particularly widespread. Pollen grains with one polar aperture occur frequently in basal angiosperms and monocots while tricolpate pollen is a synapomorphy of the ...
Nadot, Sophie, Penet, Laurent, Dreyer, Leanne, Forchioni, Arlette, Ressayre, Adrienne   +4 more
openaire   +3 more sources

Relação entre os estádios de desenvolvimento dos micrósporos e as características morfológicas do botão floral em pimentão (Capsicum annuum L.) Relationship among the development stages of microspores and the morphological characteristics of the floral bud in sweet pepper (Capsicum annuum L.)

Ciência Rural, 1995
Vários fatores influenciam a cultura de anteras, entre eles, o estádio de desenvolvimento dos micros poros. O presente estudo teve por objetivo verificar a relação entre o estádio de desenvolvimento dos micrósporos com algumas características ...
José Magno Queiroz Luz, Renata Silva, Lisete Chamma Davide, José Eduardo Brasil Pereira Pinto   +3 more
doaj   +1 more source

Optical and ultrastructural study of the pollen grain development in hermaphrodite papaya tree (Carica papaya L.)

Brazilian Archives of Biology and Technology, 2008
The objective of this study was to describe the pollen grain development in hermaphrodite papaya tree. The flower buds were collected at different stages of the development and the anthers were treated chemically for observation under optical and ...
Lídia Márcia Silva Santos, Telma Nair Santana Pereira, Margarete Magalhães de Souza, Pedro Correa Damasceno Junior, Fabiane Rabelo da Costa, Beatriz Ferreira Ribeiro, Noil Gomes de Freitas, Messias Gonzaga Pereira   +7 more
doaj   +1 more source

Floral morphology and anther development in diandrous orchid Paphiopedilum purpuratum with their taxonomic implications

Guangxi Zhiwu
The taxonomy of Paphiopedilum Pfitz. has been disputed and needs more data for clarification. Floral morphology and anther development in P. purpuratum were observed using microscope and paraffin section. The results were as follows: (1) It was supported
ZHU Yong, HUANG Jialin, TAO Kaifeng, WANG Yuecheng, ZHANG Jin, LI Lu   +5 more
doaj   +1 more source

Chemical mutagenesis in head cabbage (Brassica oleracea var.capitata L.): III effect of ethyl methane sulphonate on mycosporogenesis and pollen fertility [PDF]

Selekcija i Semenarstvo, 2006
The aim of present investigation was to study the effect of different ethyl methane sulfonate (EMS) concentrations (0.5, 0.6 and 0.7%) on microsporogenesis and on the expression of pollen fertility in M1 plants, obtained from treated cabbage seeds ...
Nikolova Vesselina, Antonova Galina, Tomlekova Nasia, Petkova Valentina   +3 more
doaj  

Histone modifications during tobacco male meiosis

Biologia Plantarum, 2019
The special and temporal distribution of several posttranslational histone modifications (H3K4me2, H3K4me3, H3K9me2, H3K27me2, H3K9ac, H3K14ac, H3K18ac, H3K27ac, H3S10ph, H3S28ph, H3T3ph, H3K4me1-H3T3ph, H3K4me3/H3T3ph H3T11ph, H2AT121ph, and H2A.XS139ph)
S. MURSALIMOV, E. DEINEKO, A. HOUBEN, D. DEMIDOV   +3 more
doaj   +1 more source

Rice cold tolerance at the reproductive stage in a controlled environment Tolerância ao frio do arroz no estádio reprodutivo sob condições controladas

Scientia Agricola, 2006
Cold tolerance of rice (Oryza sativa L.) during the reproductive stage is important to guarantee high yield under low temperature environments. Field selection, however, does not allow identification of adequate tolerance sources and limits selection of ...
Renata Pereira da Cruz, Sandra Cristina Kothe Milach, Luiz Carlos Federizzi   +2 more
doaj   +1 more source

Comportamiento meiótico de diferentes especies de lulo, Solanum sp Meiotic behavior of lulo species, Solanum sp

Acta Agronómica, 2010
Se realizó un análisis del comportamiento meiótico de las especies de lulo S. hirtum, S. quitoense y S. sessiliflorum, siguiendo la metodología convencional para los estudios de microsporogénesis.
Nancy Maricela Pareja Ordóñez, Nazira Katherine Santacruz Ordóñez, Héctor Ramiro Ordóñez Jurado, Tulio César Lagos Burbano   +3 more
doaj