Microtubule organizing centers and the origin of centrioles during spermatogenesis in the PteridophytePhylloglossum

Renzaglia, Karen S.; Maden, Angel R.

doi:10.1002/(sici)1097-0029(20000601)49:5<496::aid-jemt12>3.0.co;2-h

Cited by 15 publications

(20 citation statements)

References 41 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It is interesting to note that new centrioles originate from preexisting PCM-like material. This is the case for instance in plant cells during spermatogenesis (Renzaglia and Maden, 2000) and in vertebrate cells after destruction of primary centrioles (Khodjakov et al, 2002). Perhaps de novo centriole formation is initiated from a preexisting seed that resides within the PCM but is not recognizable by ultrastructural analysis.…”

Section: S Solidissimamentioning

confidence: 98%

“…Some plant species possess flagellated sperm and therefore need centrioles to generate basal bodies during spermatogenesis (Renzaglia and Maden, 2000). Depending on the species, the number of centrioles in each sperm cell varies from two to thousands.…”

Section: S Solidissimamentioning

confidence: 99%

“…These centrioles are structurally similar to those of animal cells and form de novo in spermatogenous cells, originating within material that resembles PCM (PCM-like material). However, the newly formed structures cannot duplicate further, indicating that they do not possess all the features of bona fide centrioles (Renzaglia and Maden, 2000). Basal bodies also form from no apparent preexisting structure in paraspermatozoa in the annelid Tubifex tubifex (Ferraguti et al, 2002) and when the amoeba Naegleria gruberi differentiates into a flagellate upon starvation (Levy et al, 1998).…”

Section: S Solidissimamentioning

confidence: 99%

See 2 more Smart Citations

The arithmetic of centrosome biogenesis

Delattre¹,

Gönczy²

2004

Journal of Cell Science

145

110

View full text Add to dashboard Cite

How do cells regulate centrosome number? A canonical duplication cycle generates two centrosomes from one in most proliferating cells. Centrioles are key to this process, and molecules such as centrins, SAS-4 and ZYG-1 govern daughter centriole formation. Cdk2 activity probably couples centrosome duplication with the S phase, and a licensing mechanism appears to limit centrosome duplication to once per cell cycle. However, such mechanisms must be altered in some cells – for example, spermatocytes – in which centrosome duplication and DNA replication are uncoupled. There are also alternative pathways of centrosome biogenesis. For example, one centrosome is reconstituted from two gametes at fertilization; in this case, the most common strategy involves differential contributions of centrioles and pericentriolar material (PCM) from each gamete. Furthermore, centrioles can sometimes form de novo from no apparent template. This occurs, for instance, in the early mouse embryo and in parthenogenetic species and might rely on a pre-existing seed that resides within PCM but is not visible by ultrastructural analysis.

show abstract

Section: S Solidissimamentioning

confidence: 98%

Section: S Solidissimamentioning

confidence: 99%

Section: S Solidissimamentioning

confidence: 99%

See 1 more Smart Citation

The arithmetic of centrosome biogenesis

Delattre¹,

Gönczy²

2004

Journal of Cell Science

145

110

View full text Add to dashboard Cite

show abstract

“…The only homosporous lycophyte with multi£agellated sperm (ca. 20 £agella) is Phylloglossum (¢gure 8a): this condition in a sole member of the Lycopodiaceae most certainly is an autapomorphy (Renzaglia & Whittier 1993;Renzaglia & Maden 2000).…”

Section: Spermatogenesismentioning

confidence: 99%

Vegetative and reproductive innovations of early land plants: implications for a unified phylogeny

Renzaglia

Rjt

Nickrent

et al. 2000

Phil. Trans. R. Soc. Lond. B

213

165

View full text Add to dashboard Cite

As the oldest extant lineages of land plants, bryophytes provide a living laboratory in which to evaluate morphological adaptations associated with early land existence. In this paper we examine reproductive and structural innovations in the gametophyte and sporophyte generations of hornworts, liverworts, mosses and basal pteridophytes. Reproductive features relating to spermatogenesis and the architecture of motile male gametes are overviewed and evaluated from an evolutionary perspective. Phylogenetic analyses of a data set derived from spermatogenesis and one derived from comprehensive morphogenetic data are compared with a molecular analysis of nuclear and mitochondrial small subunit rDNA sequences.Although relatively small because of a reliance on water for sexual reproduction, gametophytes of bryophytes are the most elaborate of those produced by any land plant. Phenotypic variability in gametophytic habit ranges from leafy to thalloid forms with the greatest diversity exhibited by hepatics. Appendages, including leaves, slime papillae and hairs, predominate in liverworts and mosses, while hornwort gametophytes are strictly thalloid with no organized external structures. Internalization of reproductive and vegetative structures within mucilage-¢lled spaces is an adaptive strategy exhibited by hornworts. The formative stages of gametangial development are similar in the three bryophyte groups, with the exception that in mosses apical growth is intercalated into early organogenesis, a feature echoed in moss sporophyte ontogeny.A monosporangiate, unbranched sporophyte typi¢es bryophytes, but developmental and structural innovations suggest the three bryophyte groups diverged prior to elaboration of this generation. Sporophyte morphogenesis in hornworts involves non-synchronized sporogenesis and the continued elongation of the single sporangium, features unique among archegoniates. In hepatics, elongation of the sporophyte seta and archegoniophore is rapid and requires instantaneous wall expandability and hydrostatic support. Unicellular, spiralled elaters and capsule dehiscence through the formation of four regular valves are autapomorphies of liverworts. Sporophytic sophistications in the moss clade include conducting tissue, stomata, an assimilative layer and an elaborate peristome for extended spore dispersal. Characters such as stomata and conducting cells that are shared among sporophytes of mosses, hornworts and pteridophytes are interpreted as parallelisms and not homologies.Our phylogenetic analysis of three di¡erent data sets is the most comprehensive to date and points to a single phylogenetic solution for the evolution of basal embryophytes. Hornworts are supported as the earliest divergent embryophyte clade with a moss/liverwort clade sister to tracheophytes. Among pteridophytes, lycophytes are monophyletic and an assemblage containing ferns, Equisetum and psilophytes is sister to seed plants. Congruence between morphological and molecular hypotheses indicates that these data sets are tracking the...

show abstract

“…These conserved proteins interact with a variety of regulatory and motor proteins that affect patterns of cytoskeletal organization and directions of particle movement. Although, the general organization and composition of the plant cytoskeleton has been documented during the last two decades, largely through time course image reconstructions from fixed and labeled cells (reviews, Vaughn 1994, 1995;Marc 1997;Pickett-Heaps and others 1999;Renzaglia and Maden 2000;Vaughn and Harper 1998), the dynamic nature of the plant cytoskeleton has been revealed in living cells through the microinjection of fluorescently tagged cytoskeletal proteins (Hepler and others 1993;others 1990, 1993) or drugs that bind to cytoskeletal elements (Cleary 1995;Schmit and Lambert 1988).…”

Section: Introductionmentioning

confidence: 99%

The Efficacy of RNAi in the Study of the Plant Cytoskeleton

Klink

Wolniak

2000

J Plant Growth Regul

View full text Add to dashboard Cite

Recent studies on a variety of organisms point to the ubiquity of RNA interference (RNAi) as a means to induce a gene-specific block to translation. RNAi has gained popularity in the last few years in the study of a number of problems in development. In this review, we highlight recent findings with RNAi using several different kinds of animals and fungi, and we show how these responses parallel cosuppression effects described in plants nearly a decade earlier. We then point to the efficacy of RNAi in studying minor and regulatory components of the plant cytoskeleton, and we highlight some recent studies using this approach with the water fern, Marsilea vestita.

show abstract

Microtubule organizing centers and the origin of centrioles during spermatogenesis in the PteridophytePhylloglossum

Cited by 15 publications

References 41 publications

The arithmetic of centrosome biogenesis

The arithmetic of centrosome biogenesis

Vegetative and reproductive innovations of early land plants: implications for a unified phylogeny

The Efficacy of RNAi in the Study of the Plant Cytoskeleton

Contact Info

Product

Resources

About