Ultrastructural features of the life cycle ofAcetabularia mediterranea

Woodcock, Christopher L.; Miller, G. J.

doi:10.1007/bf01276766

Cited by 38 publications

(3 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Gametogenesis of green algae has been investigated by both ultrastructural and light microscopic observations. These studies have focused mainly on nuclear division (mitosis), formation of flagellar apparatus and cleavage furrows in isogamous algae; Acetabularia mediterranea (Woodcock and Miller 1973), Chlamydomonas reinhardii (Cavalier-Smith 1975) and Dictyosphaeria cavernosa (Hori and Enomoto 1978), anisogamous algae; Caulerpa (Hori 1981), Bryopsis hypnoides (Burr and West 1970) and Pseudobryopsis hainanensis (Okuda 1989), and oogamous algae; Oedogonium cardiacum Pickett-Heaps 1973, 1974). Ogawa (1988) observed chloroplast degeneration and the behavior of chloroplast DNA during male gamete formation in a coenocytic green alga, Bryopsis plumosa .…”

Section: Key Index Words: Anisogamy; Dioecious; Derbesia Tenuissima ;mentioning

confidence: 99%

Light and Electron Microscopic Observations of Preferential Destruction of Chloroplast and Mitochondrial Dna at Early Male Gametogenesis of the Anisogamous Green Alga Derbesia Tenuissima (Chlorophyta)1

Lee¹,

Motomura²,

Ichimura³

2002

J Phycol

View full text Add to dashboard Cite

Gametogenesis in male and female gametophytes was studied by light microscopy and EM in the dioecious multinucleate green alga Derbesia tenuissima (Moris & De Notaris) P. Crouan & H. Crouan, where male and female gametes differ in size. Gametogenesis was divided into five stages: 32 h (stage 1), 24 h (stage 2), 16 h (stage 3), 8 h (stage 4), and 0.5 h (stage 5) before gamete release. At stage 1, the first sign of gametogenesis observed was the aggregation of gametophyte protoplasm to form putative gametangia. At stage 2, gametangia were separated from the vegetative protoplasm of gametophytes. Morphological changes of nuclei and organelles occurred at this early stage of male gametogenesis, and organelle DNA degenerated. At stage 3, male organelle DNA had completely degenerated, whereas in female gametangia, organelle DNA continued to exist in both chloroplasts and mitochondria. Gametogenesis was almost completed at stage 4 and fully at stage 5. Small male gametes had a DNA-containing nucleus and a large mitochondrion and one or several degenerated chloroplasts. The mitochondria and plastids were devoid of DNA. The large female gametes had a nucleus and multiple organelles, all of which contained their own DNA. Thus, degeneration of chloroplast DNA along with morphological changes of organelles occurred at male gametogenesis in anisogamous green algae ( Bryopsis and D. tenuissima ), in contrast with previous studies in isogamous green algae ( Chlamydomonas , Acetabularia caliculus , and Dictyosphaeria cavernosa ) in which degeneration of chloroplast DNA occurred after zygote formation.

show abstract

Section: Key Index Words: Anisogamy; Dioecious; Derbesia Tenuissima ;mentioning

confidence: 99%

Light and Electron Microscopic Observations of Preferential Destruction of Chloroplast and Mitochondrial Dna at Early Male Gametogenesis of the Anisogamous Green Alga Derbesia Tenuissima (Chlorophyta)1

Lee¹,

Motomura²,

Ichimura³

2002

J Phycol

View full text Add to dashboard Cite

show abstract

“…First, the parallel, overlapping, side-byside arrangement is distinctive, having few analogous arrangements among the green algal motile cells. Interestingly, the gametes of Acetabularia wherein the basal bodies are "antiparallel" and overlapping (Woodcock and Miller, 1973) apparently have a similar arrangement. Second, the arrangement raises a semantic question.…”

mentioning

confidence: 99%

Ultrastructure of Cephaleuros Virescens (Chroolepidaceae; Chlorophyta). Ii. Gametes

Chapman

1980

American J of Botany

View full text Add to dashboard Cite

Transmission electron microscopic examination of Cephaleuros virescens Kunze growing on leaves of Camellia sp. indicates that gametes are similar to those of Trentepohlia aurea. The gametes bear two, smooth isokont “keeled” flagella containing typical “9 + 2” axonemes and lacking scales. Flagellar insertion is apical and the parallel basal bodies overlap laterally. Each basal body is associated with a separate multilayered structure and component microtubular spline. The latter extends posteriorly beneath the plasmalemma. A nucleus, mitochondria, chloroplasts, and cytoplasmic haematochrome droplets are present. Pyrenoids and eyespots are absent. The subcellular components of C. virescens gametes are comparable to those found in gametes of T. aurea; however, the arrangement of basal bodies and multilayered structures differs slightly from that in T. aurea. Comparison of the fine structure of gametes from Cephaleuros, Phycopeltis, and Trentepohlia clearly indicates that the (1) mode of flagellar insertion, (2) morphology, number, and arrangement of multilayered structures, and (3) keeled flagella are common to these three genera and, thus far, unique among the green algae. Although flagellar insertion is apical, it is not bilaterally symmetrical (sensu stricto), nor is it asymmetrical (cf. Chara and Nitella sperms). The arrangement may be termed “reversed bilateral symmetry” and standardization of the terminology is recommended.

show abstract

“…However, a much more extensive review of this literature and analysis of applications of ultrastructure to plant systematics will be presented in a book which is being prepared by the authors.' Gool and Nanninga (1971), Prassad and De (1971), Watson and Waterbury (1971), Wildermuth (1971) negativestaining) Fine structure of plastids and their TEM, FE structural relationships to other organelles Neushul and Dahl (1972), Pickett-Heaps (1972 a, b), Taylor (1973), Woodcock andMiller (1973) Hibberd (1973), Lembi (1973), Muller andFalk (1973) Bisalputra andBailey (1973), Descomps (1972), Lee (1972) Franke and Herth (1973), Hawkins (1972), Leadbeater (1972), Schnepf and Deichgraber (1972) Dawson (1973) Duke et al (1973), Norris (1973) Hale (1973), Peveling (1973) Hawksworth (1973) Hawksworth (1972) Peveling (…”

mentioning

confidence: 99%

Electron Microscopy and Plant Systematics

Cole¹,

Behnke

1975

TAXON

View full text Add to dashboard Cite

Summary The various techniques of electron microscopy have contributed valuable information to systematics in general and have, in many instances, been instrumental in solving taxonomic problems which had arisen from the limitations of earlier, comparative morphological studies. This paper presents evidence for the general significance of electron‐microscopic data in plant systematics. Specific applications of thin‐sectioning (TEM), freeze‐etching (FE) and scanning electron microscopy (SEM) to the taxonomy of plant groups, and corresponding publications are tabulated. A more extensive analysis of applications of ultrastructure to conventional and experimental classifications of prokaryotes, fungi, eukaryotic algae, lichens, bryophytes, ferns and seed plants will be presented in a future communication.

show abstract

Ultrastructural features of the life cycle ofAcetabularia mediterranea

Cited by 38 publications

References 11 publications

Light and Electron Microscopic Observations of Preferential Destruction of Chloroplast and Mitochondrial Dna at Early Male Gametogenesis of the Anisogamous Green Alga Derbesia Tenuissima (Chlorophyta)1

Light and Electron Microscopic Observations of Preferential Destruction of Chloroplast and Mitochondrial Dna at Early Male Gametogenesis of the Anisogamous Green Alga Derbesia Tenuissima (Chlorophyta)1

Ultrastructure of Cephaleuros Virescens (Chroolepidaceae; Chlorophyta). Ii. Gametes

Electron Microscopy and Plant Systematics

Contact Info

Product

Resources

About