- abscission zone
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Bot.the zone at the base of a leaf petiole, fruit stalk, or branch in which the abscission layer develops.
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Universalium. 2010.
abscission zone
Look at other dictionaries:
abscission zone — noun : the zone in a leaf petiole, fruit stalk, or branch often marked by a constriction within which is developed the separation layer, the vascular bundles in the zone usually being reduced in diameter, the sclerenchyma being weak or absent,… … Useful english dictionary
Abscission — (from Latin abscindere, from ab ‘off, away’ + scindere ‘to cut’) is the shedding of a body part. It most commonly refers to the process by which a plant intentionally drops one or more of its parts, such as a leaf, fruit, flower or seed, though… … Wikipedia
abscission layer — Bot. the layer of specialized, cutinized parenchyma cells that develops in the abscission zone, the disintegration of which causes abscission. Also called separation layer. [1915 20] * * * … Universalium
abscissionzone — abscission zone n. The region at the base of a leaf, flower, fruit, or other plant part, where the formation of a cork layer results in the separation of that part from the plant body. * * * … Universalium
hormone — hormonal, hormonic /hawr mon ik, moh nik/, adj. /hawr mohn/, n. 1. Biochem. any of various internally secreted compounds, as insulin or thyroxine, formed in endocrine glands, that affect the functions of specifically receptive organs or tissues… … Universalium
separation layer — noun : a distinct layer within an abscission zone of a plant varying in thickness and composed of cells that are smaller and different in shape from those above and below and contain abundant starch and dense cytoplasm by the disorganization of… … Useful english dictionary
AUXINES — Les auxines sont des régulateurs de croissance qui, chez les plantes supérieures, sont synthétisés principalement dans les bourgeons. Elles contrôlent la croissance des cellules dérivées des méristèmes primaires et la multiplication des cellules… … Encyclopédie Universelle
Dehiscence (botany) — Dehiscence of the follicular fruit of milkweed (Asclepias syriaca) revealing seeds within. Dehiscence is the opening, at maturity, in a pre defined way, of a plant structure, such as a fruit, anther, or sporangium, to release its contents.… … Wikipedia
CROISSANCE (biologie) — La notion de croissance s’est imposée d’abord à l’esprit humain par l’observation de l’augmentation de taille des êtres vivants. Puis l’emploi du mot s’est élargi, soit par application à divers produits de leurs activités ou par métaphore (la… … Encyclopédie Universelle
leaf — leafless, adj. leaflike, adj. /leef/, n., pl. leaves /leevz/, v. n. 1. one of the expanded, usually green organs borne by the stem of a plant. 2. any similar or corresponding lateral outgrowth of a stem. 3. a petal: a rose leaf. 4. leaves… … Universalium
