Results 41 to 50 of about 519 (135)

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

THE USE OF MALE STERILITY OF OGURA TYPE IN RADISH BREEDING FOR HETEROSIS

Овощи России, 2011
The morphological marker characteristics of the flower and cytological features of microgametogenesis and microsporo-genesis in sterile plants have been studied to identify and select plants bearing Ogura male sterility type.
M.I. Fedorova, T.V. Zhayachkovskaya
doaj   +1 more source

Imaging malaria parasites across scales and time

Journal of Microscopy, Volume 301, Issue 2, Page 122-150, February 2026.
Abstract The idea that disease is caused at the cellular level is so fundamental to us that we might forget the critical role microscopy played in generating and developing this insight. Visually identifying diseased or infected cells lays the foundation for any effort to curb human pathology.
Julien Guizetti
wiley   +1 more source

Pollen, Tapetum, and Orbicule Development in Colletia paradoxa and Discaria americana (Rhamnaceae)

The Scientific World Journal, Volume 2012, Issue 1, 2012., 2012
Tapetum, orbicule, and pollen grain ontogeny in Colletia paradoxa and Discaria americana were studied with transmission electron microscopy (TEM). The ultrastructural changes observed during the different stages of development in the tapetal cells and related to orbicule and pollen grain formation are described.
M. Gotelli, B. Galati, D. Medan, Harsh P. Bais   +3 more
wiley   +1 more source

The androecium of Adenium obesum (Apocynaceae): anther and pollen grains development

Ornamental Horticulture
In this study, we describe anther development in Adenium obesum, providing information on microsporogenesis, microgametogenesis, and the structure of mature pollen grains.
Deborah Cristina Dias Campos, Clivia Carolina Fiorilo Possobom, Elka Fabiana Aparecida Almeida, Sabrina Maihave Barbosa Ramos, Silvia Nietsche   +4 more
doaj   +1 more source

Imaging of Molecular and Developmental Responses to Abiotic Stresses in Reproductive Tissues

Physiologia Plantarum, Volume 178, Issue 1, January/February 2026.
ABSTRACT Abiotic stresses, such as drought, salinity, and extreme temperatures, have profound effects on plant reproduction, often leading to reduced fertility and yield. Reproduction in plants involves complex interactions between diverse cells, necessitating spatiotemporal resolution to understand how stress impacts each component of this intricate ...
Hana Daryanavard, Teresa Paraiso, María Cielo Pasten, Bianca Maria Orlando Marchesano, Marta Adelina Mendes, Hélène S. Robert, Francesca Resentini, Joëlle K. Mühlemann   +7 more
wiley   +1 more source

Comparative insights into molecular pathways influencing germline development in early‐divergent angiosperms

The Plant Journal, Volume 125, Issue 2, January 2026.
SUMMARY The molecular and genetic mechanisms regulating female germline development remain largely unknown in basal and early‐divergent angiosperms. This contrasts with recent progress in model eudicots such as Arabidopsis thaliana and monocots, such as rice, barley, and maize. In this study, we investigate the genetic pathway governing female germline
Jorge Lora, Matthew R. Tucker, Neil J. Shirley, Chao Ma, José I. Hormaza   +4 more
wiley   +1 more source

3D Electron Microscopy Reveals the Structural Complexity of the Intravacuolar Membranous Network in Cyrilia lignieresi‐Infected Erythrocytes of the Fish Synbranchus marmoratus

Journal of Eukaryotic Microbiology, Volume 72, Issue 4, July/August 2025.
ABSTRACT This study employs advanced three‐dimensional electron microscopy techniques, including Transmission Electron Microscopy (TEM) tomography and freeze‐fracture imaging via scanning electron microscopy (SEM), to investigate the ultrastructural organization of Cyrilia lignieresi‐infected red blood cells (iRBCs) in the host fish Synbranchus ...
Brenda Santarém Fachetti, Maíra Turiel‐Silva, Camila Wendt, Hilton Tulio Costi, Edilene Oliveira da Silva, Ana Paula Drummond Rodrigues, Wanderley de Souza, Kildare Miranda, José Antonio Picanço Diniz   +8 more
wiley   +1 more source

Symmetric pollen mitosis I and suppression of pollen mitosis II prevent pollen development in Brachiaria jubata (Gramineae)

Brazilian Journal of Medical and Biological Research, 2005
Microsporogenesis and pollen development were analyzed in a tetraploid (2n = 4x = 36) accession of the forage grass Brachiaria jubata (BRA 007820) from the Embrapa Beef Cattle Brachiaria collection that showed partial male sterility.
C. Risso-Pascotto, M.S. Pagliarini, C.B. Valle, L. Jank   +3 more
doaj   +1 more source

Patterns and Drivers of Pollen Temperature Tolerance

Plant, Cell &Environment, Volume 48, Issue 2, Page 1366-1379, February 2025.
ABSTRACT Pollen, a pivotal stage in the plant reproductive cycle, is highly sensitive to temperature fluctuations, impacting seed quality and quantity. While the importance of understanding pollen temperature limits (Tmin, Topt, Tmax – collectively PTLs) is recognized, a comprehensive synthesis of underlying drivers is lacking.
Donam Tushabe, Sergey Rosbakh
wiley   +1 more source