Some ultrastructural aspects of spermatogenesis inLycopodium complanatum

Carothers, Zane B.; Robbins, Robert R.; Haas, David L.

doi:10.1007/bf01287483

Cited by 24 publications

(12 citation statements)

References 15 publications

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“…This notion is corroborated by fact that the bridges do not affect either the MR microtubules overlying the LL or those underlying the plasmalemma, LL and plasmalemma, possibly offering a useful analogous supporting function. The short, bent processes opposite to the keels on the MLS microtubules are similar to those described in Lycopodium complanatum (Carothers et al 1975) and in Ceratopteris thalictroides (Duckett et al 1979) and, interestingly, occupy the position on the MR elements of the intermicrotubule bridges mentioned above. The significance, if any, of this spatial correspondence is a question that the present observations raise but cannot answer.…”

Section: Discussionsupporting

confidence: 73%

“…Therefore, a bi-layered MLS organization hinged on a common typical MR and an LL of uninterrupted parallel plates can be inferred for the present spermatozoid. The keels studding the MLS microtubules resemble those in the spermatozoids of Marchantia (Carothers and Kreitner 1967), Equisetum (Duckett 1973), Lycopodium complanatum (Carothers et al 1975) and Ceratopteris thalictroides (Duckett et al 1979). As far as we know, the opaque filaments observed by us between the osmiophilic crest and the outer MR edge have never previously been described in fern spermatozoids.…”

Section: Discussionsupporting

confidence: 54%

“…trichomanes spermatozoid is spiral-shaped like that of most ferns so far described. A four-layered organization of the MLS is widespread in bryophytes (Carothers and Kreitner 1967;Renzaglia and Duckett 1987) and pteridophytes (Bell et al 1971;Duckett 1973;Carothers et al 1975;Robbins and Carothers 1978). Therefore, a bi-layered MLS organization hinged on a common typical MR and an LL of uninterrupted parallel plates can be inferred for the present spermatozoid.…”

Section: Discussionmentioning

confidence: 76%

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An ultrastructural study of the mature spermatozoid of the fern Asplenium trichomanes L. subsp. trichomanes

Gori

Muccifora

Woo³

et al. 1997

Sexual Plant Reproduction

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Asplenium trichomanes L. subsp. trichomanes spermatozoids are spirals of about five turns. Keels link the elements of the microtubular ribbon with the plates of the lamellar layer (LL) which are uninterrupted, parallel and curved with an inner angle of about 150°. Electron-opaque filaments connect the microtubules of the multilayered structure (MLS) and the osmiophilic crest, the LL and the MLS-associated mitochondrion and the latter and the plasmalemma. The nucleus occupies the 2.5-3 posterior turns and has an inner honeycombshaped chromatin mass and an outer highly condensed chromatin mass with randomly scattered electron-transparent areas. The basal bodies of the ca. 50 flagella are bounded by a reticulum of granular material which forms a plug inside their proximal region; the proximal region of the flagellum has a 9 + 0 pattern. The axoneme has a 9 + 2 pattern. & k w d :

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Section: Discussionsupporting

confidence: 73%

Section: Discussionsupporting

confidence: 54%

Section: Discussionmentioning

confidence: 76%

See 1 more Smart Citation

An ultrastructural study of the mature spermatozoid of the fern Asplenium trichomanes L. subsp. trichomanes

Gori

Muccifora

Woo³

et al. 1997

Sexual Plant Reproduction

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“…The basal bodies of Selaginella resemble those of Lycopodium (Maden et al 1996), Lycopodiella (Maden et al 1997), and Palhinhaea (Carothers et al 1975) in that they are not dimorphic; i.e., the ABB is not characterized by lateral and dorsal triplet extensions and the PBB does not possess highly elongated ventral triplets as in mosses and liverworts. Unlike in Selaginella where basal body staggering involves a fibrous connective band, basal body and flagellar staggering in bryophytes is brought about by the growth and development of these highly elongated dimorphic basal bodies (Renzaglia and Duckett 1987;Bernhard and Renzaglia 1995).…”

Section: Locomotory Apparatusmentioning

confidence: 95%

Developmental Ultrastructure of the Male Gamete ofSelaginella

Renzaglia¹,

Bernhard²,

Garbary³

1999

International Journal of Plant Sciences

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JSTOR is a not-for-profit service that helps scholars, researchers, and students discover, use, and build upon a wide range of content in a trusted digital archive. We use information technology and tools to increase productivity and facilitate new forms of scholarship. For more information about JSTOR, please contact support@jstor.org.. The University of Chicago Press is collaborating with JSTOR to digitize, preserve and extend access to International Journal of Plant Sciences.To evaluate structural homology among streamlined, biflagellated male gametes of Selaginella and bryophytes, we undertook a thorough ultrastructural study of spermatogenesis in Selaginella kraussiana (Kunze) A. Br. As in Lycopodium and bryophytes, centrioles originate as bicentrioles in the spermatid mother cell. In the nascent spermatid, a fibrous connective band is involved in the separation and rotation of the two centriolar constituents of the bicentriole. The locomotory apparatus consists of two staggered monomorphic basal bodies that originate from the centrioles and an underlying multilayered structure (MLS), including a spline of parallel microtubules and subtending elongated lamellar strip. Beneath the MLS lies the anterior mitochondrion, which elongates during development to a length of over 1.5 cellular revolutions by progressive fusion of mitochondria. Spline microtubules (MTs) increase posteriorly from one at the anterior tip to a maximum of 19 at the cell posterior. The angle between lamellar strip plates and spline MTs changes front to back from 85Њ to 40Њ. In the late midstage spermatid, the rounded nucleus compacts and elongates in register with spline growth. Individualization of cellular coils begins at the cell anterior and progresses posteriorly leaving a cytoplasmic mass in the region between coils. In the final stages of development, the lamellar strip regresses and the cylindrical nucleus shortens. Concomitantly, the posterior mitochondrion and plastid, containing two starch grains, are positioned alongside the spline at the posterior of the cell. In development, the spermatozoid of Selaginella more closely resembles those of pteridophytes than bryophytes. Common developmental and structural features of the locomotory apparatus among Selaginella and members of the Lycopodiaceae are consistent with a monophyletic lycopsid assemblage.

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“…It was revealed that the distal fiber contains a Ca 2+ -dependent contractile protein, centrin (Melkonian et al 1992). In the sperm of ferns, the basal bodies are embedded in electron-dense material that overlies the spline microtubules of the MLS (Carothers et al 1975;Duckett 1975;Myles and Bell 1975;Duckett and Bell 1977;Renzaglia et al 1998;Renzaglia and Garbary 2001). In lycophytes, they are linked to the spline by electron-dense fibrous bands (Renzaglia and Maden 2000;Renzaglia and Garbary 2001).…”

Section: Discussionmentioning

confidence: 97%

Swimming behavior and ultrastructure of sperm of Lygodium japonicum (Pteridophyta)

Sakaushi

Okoshi

Miyamura

et al. 2003

Sexual Plant Reproduction

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Swimming behavior of the sperm of Lygodium japonicum (Pteridophyta) and the associated ultrastructure of the flagellar apparatus were studied by video microscopy, transmission electron microscopy (TEM) and scanning electron microscopy (SEM). The sperm has approximately 70 flagella that emerge from a sinistrallycoiled flagellar apparatus, and swims forward by ciliary beat of these flagella. Backward swimming was not observed even after sperm collided with obstacles. Video microscopy showed that the flagella of the swimming sperm are oriented laterally and oblique-anteriorly. TEM and SEM observations revealed that the basal bodies of these flagella are arranged in at least two rows and oriented in the same directions as observed by video microscopy. These basal bodies (flagella) are categorized into two types according to their orientation: group I (laterally directed) and group II (oblique-anteriorly directed). The directionality of the basal bodies appears to be fixed by electron-dense material around their base. The outer dynein arms of the flagellar axoneme are entirely absent. These morphological characteristics of basal bodies (flagella) may relate to the lack of backward swimming behavior of the sperm. Based on these results, the evolution of swimming behavior in the archegoniates is discussed in connection with lack of backward swimming in a distantly related green alga, Mesostigma viride, and the Streptophyta.

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Some ultrastructural aspects of spermatogenesis inLycopodium complanatum

Cited by 24 publications

References 15 publications

An ultrastructural study of the mature spermatozoid of the fern Asplenium trichomanes L. subsp. trichomanes

An ultrastructural study of the mature spermatozoid of the fern Asplenium trichomanes L. subsp. trichomanes

Developmental Ultrastructure of the Male Gamete ofSelaginella

Swimming behavior and ultrastructure of sperm of Lygodium japonicum (Pteridophyta)

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