Semences

Médias référencés

Objet de commun (3)

• La guerre des graines (Vidéo, France)
• Les enclosures des bien communs - du vivant aux logiciels libres (Vidéo, France, 00:39:58)
• Les graines de la liberté (Vidéo, 00:30:00)

Enjeu (2)

• Les biens communs, modèle de gestion des ressources naturelles (Texte, France)
• Seeds of Freedom (Vidéo, 00:30:00)

Bibliographie des communs

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Concepts voisins

SemencesAgricultureBiodiversitéPropriété intellectuelleSouveraineté alimentaireCommuns traditionnelsSécurité alimentaireForêtsPâturagesAlimentationAtmosphèreHaute mer et océansSanté publiqueClimatPêcheriesOrganisation villageoise et socialeRéchauffement climatiqueCommuns et ÉtatCommuns et marchéChangement climatiqueGestion durableOccupation et utilisation des terresÉducationVocabulaire des communsOpen sourceEnclosureJustice climatiqueAgriculture durableSeeds CommonsSemences CommunesBrevets

Définition(s)

EN

[modifier]

A seed is an embryonic plant enclosed in a protective outer covering, along with a food reserve. The formation of the seed is a part of the process of reproduction in seed plants, the spermatophytes, including the gymnosperm and angiosperm plants. Seeds are the product of the ripened ovule, after the embryo sac is fertilized by sperm from pollen, forming a zygote. The embryo within a seed develops from the zygote, and grows within the mother plant to a certain size before growth is halted. The seed coat arises from the integuments of the ovule. Seeds have been an important development in the reproduction and success of vegetable gymnosperm and angiosperm plants, relative to more primitive plants such as ferns, mosses and liverworts, which do not have seeds and use water-dependent means to propagate themselves. Seed plants now dominate biological niches on land, from forests to grasslands both in hot and cold climates. The term "seed" also has a general meaning that antedates the above – anything that can be sown, e.g. "seed" potatoes, "seeds" of corn or sunflower "seeds". In the case of sunflower and corn "seeds", what is sown is the seed enclosed in a shell or husk, whereas the potato is a tuber. In the flowering plants, the ovary ripens into a fruit which contains the seed and serves to disseminate it. Many structures commonly referred to as "seeds" are actually dry fruits. Sunflower seeds are sometimes sold commercially while still enclosed within the hard wall of the fruit, which must be split open to reach the seed. Different groups of plants have other modifications, the so-called stone fruits (such as the peach) have a hardened fruit layer (the endocarp) fused to and surrounding the actual seed. Nuts are the one-seeded, hard-shelled fruit of some plants with an indehiscent seed, such as an acorn or hazelnut.

Source : http://dbpedia.org/resource/Graine

Sources externes

Wikidata : Q40763

DBpedia EN : Graine

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Q40763 Graine

FR