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Embryo sac development in yellow passion fruit Passiflora edulis f. flavicarpa (Passifloraceae) 74
Souza,Margarete Magalhães de; Pereira,Telma Nair Santana; Hoffmann,Magali; Melo,Edésio J.T. de; Louro,Ricardo Pereira.
The yellow passion fruit, Passiflora edulis f. flavicarpa, is one of the most important Brazilian fruit crops. It is an allogamous, diploid, and self-incompatible species. It has hermaphrodite, solitary flowers, located in the leaf axils and protected by leaf bracts. The flower has an androgynophore, which is a straight stalk supporting its reproductive parts. There are usually five anthers, located at the tip of each of the five filaments. The ovary is borne just above the filaments, at the top of the androgynophore; there are three styles that are united at their base, and at the top there are three stigmas. The objective of this research was to observe embryo sac development in yellow passion flowers. Ovaries at different stages of development were...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Egg cell; Embryo sac; Passifloraceae; Yellow passion fruit; Passiflora edulis f. flavicarpa Deg.; Confocal microscopy; Megagametogenesis.
Ano: 2002 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572002000400017
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Ovule ontogeny of Tabebuia pulcherrima Sandwith (Bignoniaceae): embryo sac development 88
BITTENCOURT JR.,NELSON S.; MARIATH,JORGE E.A..
The chalazal megaspore develops in a Polygonum-type embryo sac. The amyloplast-rich endothelium is partially degraded during the expansion of the micropylar portion of the megagametophyte. Organization of the mature embryo sac is determined by the patterns of vacuolation, nuclear migration, spindle orientation and cellularization. The egg cell is slightly chalazal in relation to the synergids, and its micropylar end does not touch the micropylar channel. At the chalazal pole of the egg apparatus, the common walls between the synergids, the egg and central cells, despite their tenuity, are present in the mature megagametophyte. The polar nuclei do not fuse before fertilization and the antipodals are persistent until the first stages of endosperm formation....
Tipo: Info:eu-repo/semantics/article Palavras-chave: Embryo sac; Megagametogenesis; Female germ unit; Cellularization; Tabebuia.
Ano: 2002 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042002000200001
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Female gametophyte development in Adesmia latifolia (Spreng.) Vog. (Leguminosae - Papilionoideae) 88
Moço,Maria C.C.; Mariath,Jorge E.A..
The female gametophyte has a monosporic origin and a Polygonum type development. The female gametophyte growth consumes a large part of the neighboring nucellar cells and, in the micropylar region, part of the nucellar epidermis and internal integument. The mature gametophyte is composed of only four cells due to the ephemeral characteristic of the antipodals. The synergids are pear-shaped cells with the formation of filiform apparatus. Their nuclei lie in the micropylar region and large vacuoles in the chalazal region, while the egg cell presents an opposite polarization. The central cell accumulates starch grains and the two polar nuclei approach the egg. Occasional development of two gametophytes was recorded. The closest to the micropyle develops...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Adesmia; Embryo sac; Embryology; Female gametophyte; Leguminosae.
Ano: 2004 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042004000200004
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