Relevant bibliographies by topics / Egg apparatus

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Academic literature on the topic 'Egg apparatus'

Author: Grafiati
Published: 4 June 2021
Last updated: 9 February 2022

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Journal articles on the topic "Egg apparatus"

1

Wilms, H. J. "Ultrastructure of the egg apparatus of Spinacia." Acta Societatis Botanicorum Poloniae 50, no. 1-2 (2014): 165–68. http://dx.doi.org/10.5586/asbp.1981.024.

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The egg apparatus of <em>Spinacia</em> was studied from the time the embryo sac reaches its maximal size to just before fertilization, i.e., until about 8-9 hours after pollination. At maturity each synergid has a large elongated nucleus and prominent chalazal vacuoles, Numerous mitochondria, plastids, dictyosomes, free ribosomes, rough endoplasmic reticulum (RER), and lipid bodies are present. The cell wall exists only around the micropylar half of the synergids and each cell has a distinct, striated filiform apparatus. In general, degeneration of one synergid starts after pollination. The egg cell has a spherical nucleus and nucleolus and a large micropylar vacuole. Numerous mitochondria, some plastids with starch grains, dictyosomes, free ribosomes, and HER are present. A continuous cell wall is absent around the chalazal end of the egg cell.
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2

Halada, Richard. "Rotational Collision Apparatus for Indoor Egg Drops." Physics Teacher 41, no. 5 (2003): 305. http://dx.doi.org/10.1119/1.1571269.

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3

Sumner, M. J., and L. Van Caeseele. "The ultrastructure and cytochemistry of the egg apparatus of Brassica campestris." Canadian Journal of Botany 67, no. 1 (1989): 177–90. http://dx.doi.org/10.1139/b89-026.

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The egg apparatus of Brassica campestris L. cv. Candle (canola-rapeseed) is composed of an egg and two synergids juxtaposed at the extreme micropylar end of the megagametophyte with the egg cell displaced in a chalazal direction. The cell walls of the synergids and egg are uniformly PAS and PA–TCH–SP-positive, but contained β-linked glucans only in the micropylar region. The number and development of the cytoplasmic organelles suggested that the egg cell is relatively inactive metabolically while the synergid cells are active. The synergids contain large numbers of dictyosomes with PA–TCH–SP-positive vesicles at the maturing face. These vesicles appear to fuse with the plasma membrane in the region of the filiform apparatus. The filiform apparatuses of the synergids are micropylar finger-like projections that extend into the cytoplasm of the synergid. These are PAS and PA–TCH–SP-positive, fluoresce in uv light when stained with Calcofluor, and show a positive response for acidic polysaccharides when stained with alcian blue. After treatment with cellulase, fluorescence was not observed. The incipient degenerate synergid was intensely stained by cationic dyes 24–36 h after anthesis.
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4

Sun, Yang, Xiu Wang, Lin Pan, et al. "Plant egg cell fate determination depends on its exact position in female gametophyte." Proceedings of the National Academy of Sciences 118, no. 8 (2021): e2017488118. http://dx.doi.org/10.1073/pnas.2017488118.

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Plant fertilization involves both an egg cell, which fuses with a sperm cell, and synergid cells, which guide pollen tubes for sperm cell delivery. Therefore, egg and synergid cell functional specifications are prerequisites for successful fertilization. However, how the egg and synergid cells, referred to as the “egg apparatus,” derived from one mother cell develop into distinct cell types remains an unanswered question. In this report, we show that the final position of the nuclei in female gametophyte determines the cell fate of the egg apparatus. We established a live imaging system to visualize the dynamics of nuclear positioning and cell identity establishment in the female gametophyte. We observed that free nuclei should migrate to a specific position before egg apparatus specialization. Artificial changing in the nuclear position on disturbance of the actin cytoskeleton, either in vitro or in vivo, could reset the cell fate of the egg apparatus. We also found that nuclei of the same origin moved to different positions and then showed different cell identities, whereas nuclei of different origins moved to the same position showed the same cell identity, indicating that the final positions of the nuclei, rather than specific nucleus lineage, play critical roles in the egg apparatus specification. Furthermore, the active auxin level was higher in the egg cell than in synergid cells. Auxin transport inhibitor could decrease the auxin level in egg cells and impair egg cell identity, suggesting that directional and accurate auxin distribution likely acts as a positional cue for egg apparatus specialization.
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5

Folsom, M. W., and D. D. Cass. "Embryo sac development in soybean: cellularization and egg apparatus expansion." Canadian Journal of Botany 68, no. 10 (1990): 2135–47. http://dx.doi.org/10.1139/b90-279.

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An ultrastructural study of soybean embryo sac development was performed. Prior to the final mitotic division and cellularization a nuclear rearrangement occurs that involves the chalazal movement of one of the two micropylar nuclei. During cellularization this nucleus divides to form the egg and micropylar polar nuclei and produces the wall that separates the central ceil from title space occupied by the egg apparatus. Within this space the other nucleus divides to form the two synergid nuclei and one of the two walls that separate the egg and synergid cells from one another. Egg apparatus cells are initially densely cytoplasmic, each is enclosed by thick, highly dissected walls, and they are all similar with respect to distribution of organelles except that synergid nuclei are micropylar to the egg nucleus. There is a progressive thinning and segmentation of egg apparatus walls during cellular expansion until they resemble the beaded chain structure seen in the mature egg and synergid cell walls. Taken as a whole these observations suggest that the chalazal movement of one of the two micropylar nuclei during the 4-nucleate stage is pivotal in determining future patterns of egg apparatus development.
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6

Flores-Tornero, María, Sebastian Proost, Marek Mutwil, Charles P. Scutt, Thomas Dresselhaus, and Stefanie Sprunck. "Transcriptomics of manually isolated Amborella trichopoda egg apparatus cells." Plant Reproduction 32, no. 1 (2019): 15–27. http://dx.doi.org/10.1007/s00497-019-00361-0.

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7

Cass, D. D., D. J. Peteya, and B. L. Robertson. "Megagametophyte development in Hordeum vulgare. 2. Later stages of wall development and morphological aspects of megagametophyte cell differentiation." Canadian Journal of Botany 64, no. 10 (1986): 2327–36. http://dx.doi.org/10.1139/b86-305.

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The micropylar quartet of nuclei in the barley megagametophyte is first partitioned by a vertical wall between the synergid nuclei and by an initially horizontal wall between the micropylar polar and egg nuclei. The latter wall continues to grow in an expanding horizontal plane forming much of the upper wall of all three egg apparatus cells and eventually fusing with the megagametophyte wall peripherally. A branch of the egg – polar nucleus wall grows in a micropylar direction and becomes attached to the megagametophyte wall. After partitioning, the egg apparatus is composed of three flat cells having a ceiling wall and two upright supporting walls, which are fused centrally. The micropylar polar nucleus lies just chalazal to the ceiling wall. Expansion of the egg apparatus results in rounding of all three cells followed by lengthening and thinning of their walls in contact with the central cell. Probable membrane contacts may facilitate sperm transmission after pollination. Partitioning of the chalazal quartet of nuclei exhibits many similarities to that of the egg apparatus but with a different cellular arrangement. Transfer cell wall ingrowths appear in cells at both poles of the megagametophyte. Such ingrowths appear in the two synergid cells, representing the filiform apparatus. They also develop in two of the original three antipodal cells where these cells are in contact with the megagametophyte wall. Either the micropylar or chalazal polar nucleus migrates to a position close to the other polar nucleus. Partial fusion of polar nuclei occurs later.
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8

MAEDA, Eizo, and Kazuko MAEDA. "Ultrastructure of egg apparatus of rice (Oryza sativa) after anthesis." Japanese journal of crop science 59, no. 1 (1990): 179–97. http://dx.doi.org/10.1626/jcs.59.179.

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9

Marton, M. L. "Micropylar Pollen Tube Guidance by Egg Apparatus 1 of Maize." Science 307, no. 5709 (2005): 573–76. http://dx.doi.org/10.1126/science.1104954.

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10

Schram, T. A., and P. A. Heuch. "The egg string attachment mechanism of selected pennellid copepods." Journal of the Marine Biological Association of the United Kingdom 81, no. 1 (2001): 23–32. http://dx.doi.org/10.1017/s0025315401003368.

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The anatomy of the hook apparatus that attaches egg strings to the fish parasites Haemobaphes cyclopterina, Lernaeocera branchialis, Lernaeocera lusci, Lernaeenicus sprattae, Sarcotretes scopeli and Pennella balaenoptera (Copepoda: Pennellida) is described and illustrated. The hook rises from a cupulate base, extending posteriorly and anteriorly in the body cavity. The suspension of the apparatus in the trunk of the different species differs, but the function is similar. The hook tip enters the genital antrum, nearly penetrates the proximal end of the egg string, and continues into a notch on the antrum wall. The apex of the egg string acquires a concave depression like the finger end of a glove. In this way the string is mechanically attached inside the female genital segment. The mobile ectoparasites Lepeophtheirus salmonis and Hatschekia hippoglossi have hooks which function similarly, but perforate the strings.
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