A Tapetal Membrane in Psilotum nudum (L.) Beauv

Parkinson, Barbara M.

doi:10.1093/oxfordjournals.aob.a087607

Cited by 7 publications

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“…These structures also differ structurally and functionally from the spheroids in Psilotum nudum (L.) P. Beauv. (Parkinson 1988) and spherical structures in S. pectinata ( Figure 5B) termed composite bodies (Parkinson 1990) which are present during the formation of the outer perispore. I suggest that the coiled and dense bodies are vehicles for the transport of materials, particularly sporopollenin or its precursors, from the plasmodial tapetum to the developing inner perispore.…”

Section: Formation O F the Inner Perisporementioning

confidence: 99%

Morphological and ultrastructural variations in <i>Scliizjaea pectinata</i> (Schizaeaceae: Pteridophyta)

Parkinson

1994

Bothalia

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Schizaea pectinata (L.) Sw. was collected from the extreme ends of its geographical range in South Africa for a study of sporangial development, sporogenesis and tapetal organisation. Differences were noted in the gross morphology , in sporangium size, spore size and in the patterning of the outer exospore from the two sites. Coiled structures were associated with the development of the inner perispore in spores collected from the Transvaal, whereas dense, heterogeneous bodies were associated with the formation of this layer in spores from the Cape. Differences were also noted in the organisation of the tapetum. A cellular, parietal tapetum and a plasmodial tapetum were present in the Cape material when the spores had developed the sculptured outer exospore. In sporangia from the Transvaal, however, only a plasmodial tapetum was present at the same stage of sporoderm development. A detailed study of S. pectinata throughout its distribution is required to determine the taxonomic importance of these findings.

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Section: Formation O F the Inner Perisporementioning

confidence: 99%