The dry and wet stigmas ofPrimula obconica: Ultrastructural and cytochemical dimorphisms

Schou, O.

doi:10.1007/bf01279756

Cited by 25 publications

(6 citation statements)

References 30 publications

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“…This suggestion is supported by a number of published micrographs of protodermal cells and other newly divided cells from shoot tips, trichomes, stomata, integuments and stigmas (Ledbetter and Porter 1970;Morrison 1975;Thomson et al 1979, Lynch andRivera 1981;Sack and Paolillo 1983;Schou 1984;Kronestedt et al 1986;Lancelle et al 1986;Ryser et al 1988;Olesen and Bruun 1990) showing a thin electrondense and apparently amorphous outermost zone in the outer cell wall similar to the procuticles described here. None the less, the ultrastructure of plant cuticles is very diverse (reviewed by Holloway 1982), and even the earliest phase in cuticularization cannot be generalized, as shown by the absence of a well-demarcated procuticle in the apical meristem of Cassytha pubescens.…”

Section: Resultssupporting

confidence: 55%

Cuticle development and ultrastructure: evidence for a procuticle of high osmium affinity

Heide-Jørgensen

1991

Planta

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Transmission electron microscopy was used to investigate the development and ultrastructure of the cuticles of the bladder primordium and other parts of Utricularia, the stem of Cuscuta gronovii, and the leaves of Athanasia parviflora. In all materials investigated, except the apical meristem of Cassytha pubescens, the first-formed cuticle, named the procuticle, was very electron dense and apparently amorphous in texture. Later, the procuticle changed its ultrastructural appearance: in all species having a procuticle it lost much of its electron density. Simultaneously, it developed into a lamellar structure in U. lateriflora and Cuscuta, and became part of a lamellar cuticle proper. In U. sandersonii and Athanasia the procuticle generally remained without visible structure. The velum of the pavement epithelium of Utricularia is considered to be a slightly modified procuticle which has become loosened from the epithelial cells and stretched.

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Section: Resultssupporting

confidence: 55%

Cuticle development and ultrastructure: evidence for a procuticle of high osmium affinity

Heide-Jørgensen

1991

Planta

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“…At the proximal part of papilla of the thrum form, many secreted substances are often seen as granules ( Fig. 2), which are similar to the observations in Primula obconica (Schou 1984) and in Linum grandiflorum (Ghosh and Shivanna 1980). These secreted granules may take some part in the role of pollination, but this role could not be detected under the SEM in this present experiment.…”

Section: Stigmasupporting

confidence: 67%

Scanning electron microscopic study on pollination of Primula sieboldii E. Morren.

Satô

Yamada

1988

CYTOLOGIA

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“…The granular appearance and the discontinuities of the cuticle on nucellus cells of sugar beet is very similar to the cuticles of stigmatic papillae, e.g. in Silene (Heslop-Harrison et al 1975) and Primula (Schou 1984). Heslop-Harrison et al (1975) suggested that such cuticular discontinuities might be involved in the regulation of water passage across the cuticle.…”

Section: Discussionmentioning

confidence: 83%

A structural investigation of the ovule in sugar beet, Beta vulgaris: The micropylar nucellus

Bruun

Olesen²

1989

Nordic Journal of Botany

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A structural investigation of the ovule in sugar beet, Beta vulgaris: The micropylar nucellus Lone Bruun and P. Olesen Bruun, L. & Olesen, P. 1989. A structural investigation of the ovule in sugar beet, Beta vulgaris: The micropylar nucellus. -Nord. J. Bot. 9: 81-87. Copenhagen. ISSN 0107-055X.At the mature stage of ovule development the micropylar part of the crassinucellate nucellus in sugar beet, Beta vulgaris has been investigated by light and electron microscopy. Compared to the main body of the nucellus the columnar cells in the micropylar part appear more meristematic and display a number of structural characteristics indicative of high metabolic activity, e.g. abundant mitochondria, dilated endoplasmic reticulum, numerous dictyosomes and coated vesicles often fusing with irregular and strongly PAS+ cell walls. This tissue undergoes a gradual degeneration after having reached the mature stage and this degeneration seems to be independent of both pollination and fertilization. The cuticle structure of the apical cells in the micropylar nucellus is very similar to cuticles of stigmatic papillae in other plants, which may be related to this tissue being predetermined to be recognized and penetrated by pollen tubes. The ultrastructural features of the micropylar nucellus cells are well in accordance with a secretory activity related to penetration and guidance of pollen tubes. It is discussed whether mitochondria1 conversion of ACC to ethylene in these cells might be involved in pre-and postfertilization processes.

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The dry and wet stigmas ofPrimula obconica: Ultrastructural and cytochemical dimorphisms

Cited by 25 publications

References 30 publications

Cuticle development and ultrastructure: evidence for a procuticle of high osmium affinity

Cuticle development and ultrastructure: evidence for a procuticle of high osmium affinity

Scanning electron microscopic study on pollination of Primula sieboldii E. Morren.

A structural investigation of the ovule in sugar beet, Beta vulgaris: The micropylar nucellus

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