KSIĄŻKI POWIĄZANE ZE SŁOWEM «ARCHEGONIUM»
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University Botany Ii : (Gymnosperms, Plant Anatomy, ...
The archegonium in Pinus is a simple structure. Each archegonium consists of a short neck and a swollen venter. The neck consists of four cells arranged in a single tier. There are no neck canal cells. The venter contains an egg or oosphere ...
S M Reddy, S J Chary, 2003
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Plant Systematics - Strona 58
The archegonium consists of an outer layer of sterile cells, termed the venter, that immediately surround the egg plus others that extend outward as a tube-like neck. The archegonium is stalked in some taxa; in others the egg is rather deeply ...
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Botany for Degree Students Part-III: Bryophyta - Strona 201
It is transformed into an archegonium. Porella thus is acrogynous. The archegonia occur in a terminal cluster (Fig. 10.7). The further growth of the archegonial branch is arrested after the formation of the terminal archegonium in the cluster.
B R Vashishta, A K Sinha, Adarsh Kumar, 2011
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Developmental Biology of Fern Gametophytes - Strona 218
Archegonium development and differentiation The archegonium of fern gametophytes is a more complex and uniform structure than the antheridium. Basically it is a flask-shaped object and consists of an enlarged basal region buried in the ...
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Introductory Botany: Plants, People, and the Environment, ...
Linda Berg. (a) Each antheridium, the male gametangium, produces numerous sperm cells. (b) Each archegonium, the female gametangium, produces a single egg. FIGURE 22-4 Plant gametangia. Shown are generalized moss gametangia.
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The Evolutionary Biology of Plants - Strona 168
The egg is enclosed within the archegonium; the sperm are enclosed within the antheridium (fig. 4.1). Although the evolution of the antheridium is important, the evolutionary significance of the archegonium is the focus because this structure ...
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University Botany I : (Algae, Fungi, Bryophyta And ...
The mouth of the archegonium is covered by 4 lid or cover cells. Archegonium is covered by a single layer of sterile cells. Archegonium develops on the dorsal surface of the receptacle from a single cell called "Archegonial initial cell" (Fig. 2.6).
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The Gymnosperms - Strona 242
The functional male gamete escapes from the cytoplasm, and enters the archegonium laterally, or through the neck cells. Along with the functional gamete, several sterile nuclei may also enter into the archegonium. More commonly, however ...
Chhaya Biswas, B.M. Johri, 2013
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The Ferns (Filicales): Volume 1, Analytical Examination of ...
278. a— d= Maratiia Douglasii, after Campbell. e—f=Ophio- glossum pendulum, after Lang. a = antheridium, with divisions of spermatocytes (32) in section, perhaps not complete; £ = young antheridium ; c = archegonium ; d = young ...
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SUCCESSIVE BOTANY: FOR B. Sc Part 1 - Based on Kashmir ...
Development of archegonium 1. The archegonium develops from a single superficial cell on the ventral surface of prothallus near the growing apical notch It functions as archegonial Initial. 2. The transverse division forming an upper and ...
WIADOMOŚCI, KTÓRE ZAWIERAJĄ SŁOWO «ARCHEGONIUM»
Sprawdź, o czym dyskutuje się w prasie krajowej i zagranicznej oraz jak jest stosowane słowo
archegonium w wiadomościach.
Institution: Google Indexer
... fern Ceratopteris richardii forming a “bouquet” at the entrance (not shown) of an open archegonium (magnification = 3000×). When released from antheridia, ... «Am J Botany, Gru 14»
Moss: Beautiful, but misunderstood
The green plant we see is the sexual stage, which produces gametes (sperm-antheridium and egg-archegonium). Moisture is necessary for these two to meet, ... «Timesonline.com, Maj 14»
Trekking back in time among Okinawa's fronded wonders
Sperm from the male organ (antheridia) of one prothallium swim into the female organ (archegonium) of a nearby prothallium. There, sperm and egg fuse to form ... «The Japan Times, Sie 13»
How Mosses Have Sex in Spite of Their Swimming-Challenged Sperm
... crannies of mosses in search of an egg concealed within a protective structure called an archegonium. As Gathering Moss author Robin Wall Kimmerer puts it, ... «Scientific American, Lip 12»
Embryological evidence for developmental lability during early …
In this interpretation, the third synergid cell can be viewed as homologous to the ventral canal cell of a gymnosperm archegonium. Ultimately, if it can be shown ... «Nature.com, Maj 06»
