Results 161 to 170 of about 2,001,626 (195)
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1984
The female gametophyte develops from the megaspore formed in the nucellar tissue of the ovule. The megaspore enlarges and after some mitotic divisions a small coenocyte differentiates. In general, a megagametophyte consists, after cytokinesis, of an egg apparatus, a central cell, and antipodal cells.
Willemse, M.T.M., van Went, J.L.
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The female gametophyte develops from the megaspore formed in the nucellar tissue of the ovule. The megaspore enlarges and after some mitotic divisions a small coenocyte differentiates. In general, a megagametophyte consists, after cytokinesis, of an egg apparatus, a central cell, and antipodal cells.
Willemse, M.T.M., van Went, J.L.
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THE BASIC AUTONOMY OF METASEQUOIA FEMALE GAMETOPHYTES
Acta Botanica Neerlandica, 1983SUMMARY In France and The Netherlands in Metasequoia glyptostroboides (Hu and Cheng) only purely female cones are present budding at the end of February. In the absence of any male gametophytic tissue a normal and complete female gametophyte develops.
Engels, F.M., Gianordoli, M.
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Female Gametophyte Development in Flowering Plants
Annual Review of Plant Biology, 2010The multicellular female gametophyte, a unique feature of higher plants, provides us with an excellent experimental system to address fundamental questions in biology. During the past few years, we have gained significant insight into the mechanisms that control embryo sac polarity, gametophytic cell specification, and recognition between male and ...
Wei-Cai, Yang +2 more
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Female Gametophytic Mutants: Diagnosis and Characterization
2010In plants, gametes are formed in multicellular haploid structures, termed gametophytes. The female gametophyte of most higher plants comprises seven cells, which develop from a single haploid spore through nuclear proliferation and subsequent cellularization. The female gametophytic cells differentiate into four distinct cell types, which play specific
Ronny, Völz, Rita, Gross-Hardt
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Features of the ultrastructure of the female gametophyte of Myosurus minimus
Journal of Ultrastructure Research, 1968Details are given of the ultrastructure of the megasporocyte, megaspore, and female gametophyte of Myosurus minimus. No evidence was found for the elimination of organelles from the megasporocyte, as reported in the orchid Dendrobium, but considerable changes were noted in the organelles during the maturation of the megaspore.
C L, Woodcock, P R, Bell
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Female gametophyte-controlled pollen tube guidance
Biochemical Society Transactions, 2010During the evolution of flowering plants, their sperm cells have lost mobility and are transported from the stigma to the female gametophyte via the pollen tube to achieve double fertilization. Pollen tube growth and guidance is largely governed by the maternal sporophytic tissues of the stigma, style and ovule.
Mihaela-Luiza, Márton +1 more
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Development and Function of the Female Gametophyte
2009For many years, the small size of the ovule of Arabidopsis thaliana has impeded the implementation of reliable techniques for the isolation of large amounts of gametophytic cells. Recently, a combination of genetic strategies and technologies for large-scale transcriptional analysis has resulted in the identification of a significant number of genes ...
N. Sánchez-León, J.-P. Vielle-Calzada
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PHOTOSYNTHESIS IN THE FEMALE GAMETOPHYTE OF GINKGO BILOBA
American Journal of Botany, 1986The female gametophyte of Ginkgo biloba is the only seed plant gametophyte known to contain chlorophyll. Measurements of photosynthetically active radiation (PAR) indicate that a gametophyte growing within an ovule can receive significant quantities of light (70 μmol photons m
William E. Friedman, Thomas E. Goliber
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Development and function of the flowering plant female gametophyte
2019Flowering plants constitute an indispensable basis for the existence of most organisms, including humans. In a world characterized by rapid population growth and climate changes, understanding plant reproduction becomes increasingly important in order to respond to the resource shortage associated with this development.
Isil, Erbasol Serbes +2 more
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Pollen-tube guidance: beacons from the female gametophyte
Current Opinion in Plant Biology, 2003The sperm cell of a flowering plant cannot migrate unaided and it must be transported by the pollen-tube cell before successful fertilization can occur. The pollen tube is precisely guided to the target female gametophyte, the embryo sac, which contains the egg cell.
Tetsuya, Higashiyama +2 more
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