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File: /var/www/html/application/controllers/Detail.php
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Distinct from the motile flagellated sperm of animals and early land plants, the non-motile sperm cells of flowering plants are carried in the pollen grain to the female pistil. After pollination, a pair of sperm cells are delivered into the embryo sac by pollen tube growth and rupture. Unlike other walled plant cells with an equilibrium between internal turgor pressure and mechanical constraints of the cell walls, sperm cells wrapped inside the cytoplasm of a pollen vegetative cell have only thin and discontinuous cell walls. The sperm cells are uniquely ellipsoid in shape, although it is unclear how they maintain this shape within the pollen tubes and after release. In this study, we found that genetic disruption of three endomembrane-associated cation/H exchangers specifically causes sperm cells to become spheroidal in hydrated pollens of Arabidopsis. Moreover, the released mutant sperm cells are vulnerable and rupture before double fertilization, leading to failed seed set, which can be partially rescued by depletion of the sperm-expressed vacuolar water channel. These results suggest a critical role of cell-autonomous osmoregulation in adjusting the sperm cell shape for successful double fertilization in flowering plants.
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http://dx.doi.org/10.1016/j.molp.2022.07.013 | DOI Listing |
Theriogenology
December 2024
Universidade Federal de Mato Grosso (UFMT) campus Cuiabá, Avenida Fernando Corrêa da Costa, 2367, Boa Esperança, Cuiabá, 78060-900, Brazil; Programa de Pós-Graduação Stricto Sensu em Biociência Animal, Universidade de Cuiabá (UNIC), Avenida Manoel José de Arruda, 3100, Jardim Europa, Cuiabá, 78065-900, Brazil. Electronic address:
This study aimed to evaluate the impact of cholesterol supplementation at various concentrations in cryopreserved Pantaneiro bovine semen on in vitro embryo production (IVEP). Grade I and II cumulus-oocyte complexes (COCs) were collected from ovaries retrieved from a commercial slaughterhouse and matured in vitro for 24 h. The matured COCs were divided into four groups based on the concentration of cholesterol -loaded cyclodextrin (CLC) during semen cryopreservation from a Pantaneiro breed bull: Control (C) - 0 mg/mL CLC, T1 - 0.
View Article and Find Full Text PDFCommun Biol
December 2024
The Institute of Medical Science, The University of Tokyo, Minato-ku, Tokyo, 1088639, Japan.
One of the major age-related declines in female reproductive function is the reduced quantity and quality of oocytes. Here we demonstrate that structural changes in the zona pellucida (ZP) were associated with decreased fertilization rates from 34- to 38-week-old female mice, equivalent to the mid-reproductive of human females. In middle-aged mouse ovaries, the decline in the number of transzonal projections was accompanied by a decrease in cumulus cell-oocyte interactions, resulting in a deterioration of the oocyte quality.
View Article and Find Full Text PDFEnviron Sci Technol
December 2024
Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan430072, China.
As a novel organophosphate ester (NOPE), tris(2,4-di-butylphenyl) phosphate (TDtBPP) has attracted significant attention due to its unexpectedly high detection in natural environments. However, the ecological toxic effects of environmentally relevant concentrations of TDtBPP in organisms remain entirely unknown. In this study, 1 month old zebrafish were exposed to 0, 50, 500, or 5000 ng/L TDtBPP for 150 days, and the reproductive toxicity in male fish was evaluated.
View Article and Find Full Text PDFJ Inflamm Res
December 2024
Tianjin Central Hospital of Obstetrics and Gynecology/Nankai University Affiliated Maternity Hospital, Tianjin Key Laboratory of Human Development and Reproductive Regulation, Tianjin, 300100, People's Republic of China.
Purpose: To investigate the follicle microenvironments of women with premature ovarian insufficiency (POI), with normal ovarian reserve function, and who are older (age >40 years) and to identify potential therapeutic targets.
Patients And Methods: In total, 9 women who underwent in vitro fertilization(IVF) or intracytoplasmic sperm injection(ICSI) were included in this study. The first punctured follicle of each patient was used.
Reprod Domest Anim
December 2024
Animal Reproduction, Gynaecology and Obstetrics, Artificial Breeding Research Centre (ABRC), ICAR-National Dairy Research Institute, Karnal, Haryana, India.
Bull fertility is a multi-factorial trait and is affected by many factors, such as nutrition, genetics, and epigenetics. Superior quality male germplasm with high genetic merit helps to improve the livestock production trait. To achieve the target of livestock production, the availability of superior male germplasm is a great concern.
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