Antheridial Formation in Onoclea Sensibilis L.: Genesis of the Jacket Cell Walls

Kotenko, Jane L.

doi:10.1002/j.1537-2197.1985.tb08314.x

Cited by 7 publications

(2 citation statements)

References 20 publications

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“…As the autoflourescence of the antheridium was quite faint, it is unlikely that a thick cuticle can account for the impression of a separate layer. In recent TEM investigations of other leptosporangiate ferns no extra layer surrounding the antheridium was noted (Kotenko 1985(Kotenko , 1986.…”

Section: Discussionmentioning

confidence: 98%

Scanning electron microscopy of gametophyte characters and antheridial opening in some Ceylonese species of Thelypteridaceae

Tigerschiöld

1989

Nordic Journal of Botany

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Gametophytes of the fern family Thelypteridaceae were cultivated aseptically under controlled conditions and investigated with the scanning electron microscope. This report concerns six species, viz. Sphaerostephanos arbuscula S. subtruncatus, S. unitus, Macrothelypteris torresiana, Amauropelta hakgalensis and Pneumatopteris truncata. The gametophytes have some features in common. They are more or less heart‐shaped and have glandular trichomes on surfaces and margins. In the middle is an elongated cushion bearing gametangia and rhizoids on the lower surface. Antheridia are of the type common to leptosporangiates, consisting of a basal cell, a ring cell and a cap cell. Archegonia consist externally of four rows of cells meeting at the top with triangular cells. The following features are distinguishing. The form of the margin of the thallus, type of hairiness, and the abundance of glandular hairs. Acicular hairs occur in Sphaerostephanos unitus and Pneumatopteris truncata. In Amauropelta hakgalensis the archegonium deviates from the common type in having a basal layer that consists of eight cells instead of four. In Macrothelypteris torresiana the four or three top cells are markedly irregular. In Sphaerostephanos arbuscula and Amauropelta hakgalensis the antheridial cap cell is sometimes divided. The manner of opening of antheridia and release of spermatozoids varies in each of the species investigated. This investigation reveals that it is possible to identify the species from gametophyte characters only.

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Section: Discussionmentioning

confidence: 98%

Scanning electron microscopy of gametophyte characters and antheridial opening in some Ceylonese species of Thelypteridaceae

Tigerschiöld

1989

Nordic Journal of Botany

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“…Jacket cells in these families are often more numerous than in more derived taxa, suggesting evolutionary reduction in antheridial complexity. Early development of male gametangia in filicalean ferns involves specialized asymmetrical divisions prior to the production of spermatogenous and jacket initials (Gifford and Foster, 1988;Kotenko, 1985Kotenko, , 1986Kotenko, , 1990. The male sex organ in derived families is surrounded by two ring cells and a cover cell ( Figure 17).…”

Section: Antheridiamentioning

confidence: 97%

Motile Gametes of Land Plants: Diversity, Development, and Evolution

Renzaglia

Garbary

2001

Critical Reviews in Plant Sciences

128

107

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Division of the Generative Cell and Late Development in the Male Gametophyte of Ginkgo Biloba

Friedman

Gifford

1988

American J of Botany

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Division of the generative cell in the male gametophyte of Ginkgo biloba to yield the sterile cell and spermatogenous cell was examined in vivo and in vitro. Evidence is presented in support of a new interpretation of development in which the sterile cell and spermatogenous cell arise from an unusual anticlinal ringlike division of the generative cell. This type of cell division is only known to occur during antheridial development in leptosporangiate ferns and stomatal development among certain ferns in the Schizaeaceae and Polypodiaceae. The strong similarities in development and cell arrangement within the male gametophytes of cycads and Ginkgo suggest that division of the generative cell in cycads may be the same as in Ginkgo. Although the ringlike (conically annular) divisions in the antheridia of leptosporangiate ferns and the male gametophytes of Ginkgo (and probably cycads) are remarkably similar and result in the production of a central spermatogenous cell, it is conjectural as to whether these patterns represent a striking convergence or evolutionary homology.

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Antheridial Formation in Onoclea Sensibilis L.: Genesis of the Jacket Cell Walls

Cited by 7 publications

References 20 publications

Scanning electron microscopy of gametophyte characters and antheridial opening in some Ceylonese species of Thelypteridaceae

Scanning electron microscopy of gametophyte characters and antheridial opening in some Ceylonese species of Thelypteridaceae

Motile Gametes of Land Plants: Diversity, Development, and Evolution

Division of the Generative Cell and Late Development in the Male Gametophyte of Ginkgo Biloba

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