polar nuclei

Two centrally located nuclei in the embryo sac that unite with a second sperm cell in a triple fusion. In some plant species (particularly the monocotyledons), the product of this fusion develops into the endosperm.

Glossary of Biotechnology for Food and Agriculture . 2015.

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  • Polar body — A polar body is a cell structure found inside an ovum. Both animal and plant ova possess it. Asymmetrical cell division (cytokinesis) leads to the production of polar bodies during oogenesis. To conserve nutrients, the majority of cytoplasm is… …   Wikipedia

  • polar nucleus — noun : either of two nuclei that fuse in the center of the embryo sac of a seed plant to form the primary endosperm nucleus * * * Bot. either of two female haploid nuclei, in the embryo sac of flowers, that fuse to produce a diploid nucleus,… …   Useful english dictionary

  • polar nucleus — noun Date: 1882 either of the two nuclei of a seed plant embryo sac that are destined to form endosperm …   New Collegiate Dictionary

  • polar nucleus — Bot. either of two female haploid nuclei, in the embryo sac of flowers, that fuse to produce a diploid nucleus, which combines with a male nucleus to form the endosperm. [1880 85] * * * …   Universalium

  • polar nucleus — po′lar nu′cleus n. bot either of two female haploid nuclei, in the embryo sac of flowers, that fuse to produce a diploid nucleus • Etymology: 1880–85 …   From formal English to slang

  • Payload for Antimatter Matter Exploration and Light-nuclei Astrophysics — PAMELA is a bacronym for Payload for Antimatter Matter Exploration and Light nuclei Astrophysics .Launched on 15 June 2006, PAMELA is the first satellite dedicated to detecting cosmic rays and also antimatter from space, in the form of positrons… …   Wikipedia

  • angiosperm — /an jee euh sperrm /, n. Bot. a plant having its seeds enclosed in an ovary; a flowering plant. Cf. gymnosperm. [ANGIO + SPERM] * * * ▪ plant Introduction       any member of the more than 300,000 species of flowering plants (division Anthophyta) …   Universalium

  • Double fertilization — The parts of a flower Double fertilization …   Wikipedia

  • Ovule — This article is about the plant structure. For animal ovules, see ovum. Micropyle and Ovular redirect here. For the structure in animals, see Micropyle (zoology). For the shape, see oval. Location of ovules inside a Helleborus foetidus flower… …   Wikipedia

  • Fertilisation — This article is about fertilisation in animals and plants. For fertilisation in humans specifically, see Human fertilization. For Soil improvement, see Fertiliser. Conceive redirects here. For the health magazine, see Conceive magazine. For… …   Wikipedia

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