Current studies of the pteridophyte life cycle

Sheffield, E.; Bell, P. R.

doi:10.1007/bf02858324

Cited by 50 publications

(33 citation statements)

References 98 publications

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“…The dyad is clearly defined by a pronounced organelle band in the equatorial region and cytoplasmic invagination at its margin. The organelle band is like that in other monoplastidic species in that it does not include plastids (which remain anchored at the spindle poles), whereas plastids are included in the organelle band of polyplastidic species (Sheff ield and Bell 1987, Brown and Lemmon 1991b, 1997.…”

Section: Discussionmentioning

confidence: 99%

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Sporogenesis in Eusporangiate Ferns: I. Monoplastidic Meiosis in Angiopteris (Marattiales)

Brown

Lemmon

2001

J Plant Res

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This is the first report of monoplastidic cell division in ferns. Angiopterk (Marattiales) undergoes the more primitive form of monoplastidic meiosis, while other ferns have evolved the polyplastidic type typical of seed plants. In monoplastidic cell division, the single plastid divides and serves as site of the microtubule organizing center (MTOC) for spindle formation resulting in coordinated division of plastid, nucleus, and cytoplasm. In plants with polyplastidic cell division, the MTOC is diffuse and generally perinuclear. only a few hepatics), Isoetes, Selaginella, certain generic segregates of Lycopodium, and in members of the Marattiales. It is not known to occur in psilophytes, Equisetum, leptosporangiate ferns, or seed plants. Monoplastidic cell division is seen as a plesiomorphic feature that was inherited from algal ancestors containing a single plastid and modified through evolution. Monoplastidic meiosis occurs in all groups of bryophytes (although in

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Section: Discussionmentioning

confidence: 99%

“…In a cladistic study of the Marattiales (Hill and Camus 1986) only four characters of spores, all pertaining to sculpture of the mature wall, were scored. Reviews of sporogenesis in pteridophytes by Sheffield and Bell (1987) and Rudramuniyappa and Suvarnkhandi (1991) made no mention of the Marattiales.…”

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confidence: 99%

Sporogenesis in Eusporangiate Ferns: I. Monoplastidic Meiosis in Angiopteris (Marattiales)

Brown

Lemmon

2001

J Plant Res

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“…Larger specimens and the more mature stages of sporangial development were transferred into ice-cold 0.0SM Pipes buffer diluted by 50% and left overnight (Sheffield & Bell 1978, Hayat 1970). Post-fixation was carried out on ice using 2% OsO, made up in the appropriate buffer for a period of 2-4 h. Some of the material was post-fixed under a vacuum of 40 kPa for 1.5-2 h at room temperature.…”

Section: Methodsmentioning

confidence: 99%

Spore Wall Development inSchizaea Pectinata(Schizaeaceae: Pteridophyta)

Parkinson¹

1995

Grana

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A blechnoid type of spore wall developed in Scltizaeapecrinaru (L.) Sw. consisting of inner and outer exospore, inner and outer perispore. The inner exospore was initiated by the formation of electron dense lamellae from the surface of the plasma membrane around each member of the tetrad. Tetnds were enclosed within chambers in the plasmodia1 tapetum. The outer exospore constituted the bulk of the spore wall and accumulated, at first. in irregular patches on the inner exospore; its deposition involved the activity of the plasma membrane of the plasmodial tapetum. A reticulate pattern developed on the outer exospore as a result of a differential pattern of growth involving plasmodia1 tapetum activity. The heterogeneous inner perispore was firmly attached to the outer exospore and its deposition involved structures found in the sporangial loculus. The outer perispore was loosely attached to the inner perispore and its formation was associated with composite bodies, which differed from the structures involved in inner perispore development, and consisted of partially polymerised sporopollenin, phenolics and silicon particles. Only the initiation of the inner exospore involved sporal activity, the development of the other parts of the spore wall were intimately associated with the plasmodial tapetum and with bodies present in the sporangial loculus. There is a large amount of literature relating to microsporogenesis and the ontogeny of the angiosperm pollen grain but relatively little literature on spora! ontogeny of the pteridophytes in general and for the homosporous ferns in particular.The greatest contribution to early ultrastructural studies of sporogenesis within the pteridophytes was by Lugardon (1966Lugardon ( , 1968 on spore wall ontogeny and cytology in Bleclrtirriti spicnrif, Ostiiirtidn regnlis and Eqiiisetirtii itin.vitiziiiti. GullvAg ( 1970) compared events which occurred during the development of L~copodiirni oiriiotiriirtii spores with events which occurred during microsporogenesis in the angiosperms and Robert (1970, 1971 a, b) working on Selnginella krnirssinnn and S. selaginoides discussed the involvement of the tapetum in the formation of the spore wall. Lugardon (1971Lugardon ( , 1972 defined the terminology which he used in describing the various wall layers of pteridophyte spores. He was of the opinion that the sub-division of the exine, defined in terms of the organisation of this layer in pollen, could not be applied correctly to the layers of the exospore. From descriptions of spore wall structure in a wide selection of homosporous ferns (Lugardon 1974(Lugardon , 1975(Lugardon , 1976 he drew a comparison between pollen and pteridophyte'spore walls (Lugardon 1978). Lugardon's terminology has been applied to the spore wall layers in S. pecriiintn.Publications by Sheffeld & Bell (1979) on ultrastructural events during meiosis in Pferidiurn aqrriliriirm, by Lugardon (1979) on the formation of the spore wall from the tetrad stage in Psilotiitti and by Pettitt (19790) and cytochemical aspect...

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“…Haploid gametophytes of ferns can be used as models to study haploid plant development and to compare the developmental patterns between haploid and diploid plants (Dyer 1979;Sheffield & Bell 1987;Binding & Mordhorst 1991). Moreover, heterosporous ferns are characterized as higher plants by female and male gametophytes.…”

Section: Introductionmentioning

confidence: 99%

Isolation and culture of protoplasts from young sporophytes ofSalvinia natans aseptically obtained by co-culture of female and male gametophytes

Nakamura¹,

Maeda²

1994

Plant Cell Tiss Organ Cult

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Sporophytes were aseptically obtained by co-culture of female and male gametophytes derived from two types of spores (megaspores and microspores) of the heterosporous fern Salvinia natans All. Protoplasts isolated enzymatically from juvenile leaflets of sporophytes were cultured in a 1/10 Murashige and Skoog's medium containing 2.2 ktM naphthalene acetic acid, 2.2 ~tM 6-benzyl-aminopurine, 0.35 M mannitol, and 0.05 M sucrose. Cell division took place within 6 days of culture, and cell-clusters composed of 9-10 cells were observed after 30 days of culture.

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Current studies of the pteridophyte life cycle

Cited by 50 publications

References 98 publications

Sporogenesis in Eusporangiate Ferns: I. Monoplastidic Meiosis in Angiopteris (Marattiales)

Sporogenesis in Eusporangiate Ferns: I. Monoplastidic Meiosis in Angiopteris (Marattiales)

Spore Wall Development inSchizaea Pectinata(Schizaeaceae: Pteridophyta)

Isolation and culture of protoplasts from young sporophytes ofSalvinia natans aseptically obtained by co-culture of female and male gametophytes

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