nucellus


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nucellus

the tissue within the OVULE of a plant, surrounded by INTEGUMENTS (1) and containing the EMBRYO SAC.
References in periodicals archive ?
The inner and outer integuments elongated rapidly and almost enclosed the nucellus (Fig.
Obturators, a transmitting plug of the placental region that facilitates entered of the polinic tube in the ovule, also occur in Liliaceae and some other groups; in Euphorbiaceae the obturator is in direct contact with the nucellus (Endress, 1994; Souza, 2009; De-Paula and Sajo, 2011).
Indeed, the male flowers have a well-developed gynoecium with well-formed ovaries and ovules possessing normal integuments and a nucellus, although we could not confirm a normal embryo sac.
The developmental stage of the nucellus at the time of pollination drop release can vary widely among different gymnosperm taxa.
Through division of the cells in the micropylar end of the nucellus, a cell proliferation is developed that extends beyond the micropyle (Figure 6A).
Nucellus as an experimental system in basic and applied tissue culture research.
Foraging strategies of dogwhelks, Nucellus lapillus (L.
An archesporial cell in the nucellus tissue would directly develop into a megasporocyte that subsequently formed the megaspore tetrads aftermeiosis.
hilum, strophiole (a crestlike excrescence about the hilum), micropyle (opening through which the pollen tube enters), or chalaza (the region opposite the micropyle, where the integuments and nucellus (central part in which the embryo sac develops) are joined) that either softens, cracks, ruptures, or collapses during treatment (Rolston, 1978, Baskin et al.
In the region of the micropyle, cells of the two teguments and a layer of nucellus with elongated cells present phenolic compounds forming the epistase (Figure 7e, g-h).
Modern seeds develop from a mature ovule, the female gametophyte being embedded within a fleshy nucellus.
The inner and outer integuments that appear around the periphery of the nucellus of the angiosperm ultimately become the testa or seed coat of the mature ovule (Copeland, 1976).