OVULE DEVELOPMENT IN <i>ORNITHOGALUM CAUDATUM</i> (LILIACEAE) WITH A REVIEW OF SELECTED PAPERS ON ANGIOSPERM REPRODUCTION

Tilton, Varien R.; Lersten, Nels R.

doi:10.1111/j.1469-8137.1981.tb04094.x

Cited by 33 publications

(29 citation statements)

References 70 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The column of cells that degenerates in the nucellar tip may be related to pollen tube growth since this would facilitate pollen tube passage from the micropyle to the embryo sac. A similar column of degenerate cells was first observed by Jensen (1969) in cotton and later in other species (Wilms, 1981;Tilton & Lersten, 1981;Pimienta & Polito, 1983).…”

Section: Embryo Sac Development and Fertilisationsupporting

confidence: 77%

Development of the ovular structures in peach [Prunus persica (L.) Batsch]

Arbeloa

Herrero

1991

New Phytologist

View full text Add to dashboard Cite

SUMMARYChanges in the ovular tissues of peach (Prunus persica (L.) Batsch) were studied from anthesis to fertilization or degeneration in pollinated and unpolHnated flowers. During this time the ovule undergoes a continuous developmental process. At anthesis the megagametophyte is immature and is not fully developed until 12 days later. Durmg the first three weeks following anthesis the ovule increases in length from 400 to 1200/fm, and the nucellus and integuments undergo various changes particularly in the distribution of starch and cutin. These appear to be connected with early embryo sac nutrition and protection. As the ovule matures, starch accumulates mainly in the embryo sac, integuments and at the nucellar tip. This starch disappears during early embryo sac elongation. Concomitant with starch depletion, the cutin that separated the integuments from the nucellus vanishes. Other cutin accumulates between cells in the nucellar tip, thus protecting and isolating the embryo sac. Most of these changes appear to be a fixed feature of ovule development since they were also observed in a few long lived ovules in unpollinated flowers. However, in unpolHnated fiowers development of most of the ovules is soon interrupted: callose accumulates at the chaiaza, starch disappears and the ovules degenerate.

show abstract

Section: Embryo Sac Development and Fertilisationsupporting

confidence: 77%

Development of the ovular structures in peach [Prunus persica (L.) Batsch]

Arbeloa

Herrero

1991

New Phytologist

View full text Add to dashboard Cite

show abstract

“…Although it has been held for many years that nucellar (and endothelial) cells which degenerate do so as a consequence of mechanical pressure, more recent studies indicate that degeneration of these cells is a genetically controlled phenomenon of autolysis rather than a result of mechanical pressure from the growing megagametophyte (Tilton & Lersten 1981). Folsom & Cass (1989, 1990 pointed out that, in soybean, the development of the tetranucleate embryo sac is guided by the giant central vacuole, which limits the nuclear movements, and control in this way the subsequent ontogenetic events.…”

Section: Discussionmentioning

confidence: 99%

“…Preliminary observations of the fertilization process reveal that the fusion of the polar nuclei occurs only after the pollen tube reaches the embryo sac. The moment in which the polar nuclei fuse with each other -prior to or after fertilization -is not constant in the angiosperms, and they never unite in some species (Tilton & Lersten 1981).…”

Section: Discussionmentioning

confidence: 99%

“…However, in the species studied by Mehra & Kulkarni (1985), as well as in Jacaranda mimosifolia, Parmentiera cerifera, Tecoma stans (Johri et al 1992) and in the species presented here, the antipodals persist until the first developmental stages of the endosperm. The high cytoplasmatic density and the conspicuous nucleoli in the antipodals of Tabebuia pulcherrima suggest a strong metabolic activity, which is usually associated with the functions of translocation and secretion sometimes attributed to these cells (Jensen 1972, Kapil & Bhatnagar 1981, Tilton & Lersten 1981, Willemse & van Went 1984, Mansfield et al 1991.…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Ovule ontogeny of Tabebuia pulcherrima Sandwith (Bignoniaceae): embryo sac development

Bittencourt¹,

Mariath²

2002

Rev. bras. Bot.

View full text Add to dashboard Cite

-(Ovule ontogeny of Tabebuia pulcherrima Sandwith (Bignoniaceae): embryo sac development). 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. The taxonomic significance of some embryological characters for the Bignoniaceae is discussed.RESUMO -(Ontogenia do óvulo de Tabebuia pulcherrima Sandwith (Bignoniaceae): desenvolvimento do saco embrionário). O megásporo calazal origina um saco embrionário tipo Polygonum. O endotélio rico em amiloplastos é parcialmente degradado durante a expansão da porção micropilar do megagametófito. A organização do saco embrionário maduro é determinada pelos padrões de vacuolação, migração nuclear, orientação dos fusos mitóticos e celularização. A oosfera é ligeiramente calazal em relação às sinérgides e sua extremidade micropilar não estabelece contato com o canal micropilar. Na porção calazal do aparato oosférico, as paredes comuns entre as sinérgides, a oosfera e a célula média, embora muito tênues, estão presentes no saco embrionário maduro. Os núcleos polares não se fundem antes da fecundação e as antípodas persistem até o início do desenvolvimento do endosperma. O significado taxonômico de alguns caracteres embriológicos para a família Bignoniaceae é discutido.

show abstract

“…Comparative anatomical studies of leaf and scapus features of twelve Ornithogalum species, belonging to the subgenera Ornithogalum and Beryllis, were recently done in Central Anatolia (Öztürk et al 2014). Types of crystals are especially interesting from a taxonomic point of view and Tilton and Lersten (1981) described idioblasts with calcium oxalate crystals as a type of specialized cells in the gynoecium of Ornithogalum caudatum Aiton.…”

Section: Introductionmentioning

confidence: 99%

Anatomical characteristics of two Ornithogalum L. (Hyacinthaceae) taxa from Serbia and Hungary and their taxonomic implication

Andrić¹,

Rat²,

Zorić³

et al. 2016

Acta Botanica Croatica

View full text Add to dashboard Cite

-Anatomical characters of two morphologically similar Ornithogalum taxa, O. umbellatum and O. divergens, were investigated. An analysis of leaf and scapus cross-sections was performed on plants from ten populations from Serbia and Hungary, using light microscopy. The aim of this research was to give data about the qualitative and quantitative anatomical characteristics of these taxa, in order to evaluate their taxonomic signifi cance and single out distinctive anatomical features, as well as to contribute to the knowledge of the genus Ornithogalum in the studied region. On the basis of the variability of anatomical characters, similar populations formed two clusters, joining the plants previously determined as O. divergens and O. umbellatum. The two taxa signifi cantly differed for most of the quantitative leaf and scapus characters. Since only quantitative differences were recorded in this research, anatomical characters could not be solely used to separate these two taxa. However, the results of anatomical investigations are consistent with the results of previous morphological and genetic analyses; therefore anatomical parameters could be useful as additional taxonomic characters.

show abstract

OVULE DEVELOPMENT IN ORNITHOGALUM CAUDATUM (LILIACEAE) WITH A REVIEW OF SELECTED PAPERS ON ANGIOSPERM REPRODUCTION

Cited by 33 publications

References 70 publications

Development of the ovular structures in peach [Prunus persica (L.) Batsch]

Development of the ovular structures in peach [Prunus persica (L.) Batsch]

Ovule ontogeny of Tabebuia pulcherrima Sandwith (Bignoniaceae): embryo sac development

Anatomical characteristics of two Ornithogalum L. (Hyacinthaceae) taxa from Serbia and Hungary and their taxonomic implication

Contact Info

Product

Resources

About