Structural studies of pollen tube growth in the pistil ofStrelitzia reginae

Kronestedt, Eva; Walles, Björn; Alkemar, I.

doi:10.1007/bf01282985

Cited by 13 publications

(6 citation statements)

References 16 publications

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“…The secretory products of these cells are vital for the continued growth of the pollen tubes in the ovary. The tubes grow towards the micropyle in this exudate, which probably provides nutrition and chemotropic guidance to the tubes (Welk et al 1965;Tilton and Horner 1980;Kronestedt et al 1986;Van Roggen et al 1988;Janson et al 1993Janson et al , 1994. The placental cells are papilla-shaped with a domed apex.…”

Section: Introductionmentioning

confidence: 99%

Microtubule organization in the differentiating transfer cells of the placenta inLilium spp.

1999

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Summary. Placental cells in the ovarian transmitting tissue of Lilium spp. are organized as transfer cells with inbuddings facing the ovarian locule. A detailed analysis of microtubule (MT) organization during development of these polarized cells is reported here. Formation of wall projections occurs at the apical part of the cell starting on the day of anthesis, and a fully mature secretion zone is found four days after anthesis. MTs are organized into distinct cortical and central arrays. The cortical array undergoes a unique transition at anthesis. MTs in the basal half of the cell remain in longitudinal bundles while in the apical half of the cell their longitudinal orientation is replaced by a transverse alignment. One day after anthesis, these transverse bundles become a meshwork of short, randomly organized MTs, while MTs in the basal half of the cell retain their longitudinal alignment. The realignment of MTs in the apical half of the cell coincides with the deposition of the secondary cell wall. The central array is composed of short, randomly arranged strands of MTs in the cytoplasm between the nucleus and the apical and basal periclinal walls of the cell. This array first appears as solitary strands in the apical part of the cell one day before anthesis, The central array extends during development and is eventually seen in the basal half of the cell. We propose that MTs in the cortical region near the apical wall act as templates for the deposition of cellulose microfibrils in the secondary cell wall. MTs in the central array in these transfer cells may be involved in the trafficking of vesicles and/or positioning of organelles near the secretion zone.

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Section: Introductionmentioning

confidence: 99%

Microtubule organization in the differentiating transfer cells of the placenta inLilium spp.

1999

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“…In Ornithogalum the cuticle ruptures during the secretory process (Tilton & Horner 1980). This is also the case in other species; Lilium (Rosen & Thomas 1970) and Strelitzia (Kronestedt et al 1986).…”

Section: The Cuticlementioning

confidence: 74%

“…Polysaccharides, proteins and lipids have been identified; Citrus (Ciampolini et al 1981). Lilium (Miki-Hirosige et al 1987), Commelinaceae (Owens et al 1984) and Strelitzia (Kronestedt et al 1986). Osmiophilic bodies are present in the canal secretion of Ornithagalum (Tilton & Horner 1980).…”

Section: The Stylar Canal and The Secretory Productmentioning

confidence: 99%

“…This indicates that the secretory products move through cell walls without any cell wall specialization. The canal cells are of the transfer cell type in Strefifzia (Kronestedt & Walles 1986), Lilium (Rosen & Thomas 1970, Gawlik 1984) and in Commelinaceae (Owens et al 1984). Two-layered walls are found in Citrus (Ciampolini et al 1981), the part of the wall facing the canal becomes thick at maturity.…”

Section: The Stylar Canal and The Secretory Productmentioning

confidence: 99%

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The transmitting tract in Trimezia fosteriana (Iridaceae). 1. Ultrastructure in the stigma, style and ovary

Bystedt

1990

Nordic Journal of Botany

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An ultrastructural investigation of the entire transmitting tract in Trimezia fosteriana (Iridaceae) was undertaken. The transmitting tissue is secretory but transfer cells do not occur at any level. With exception for the stigma papillae, the cells are covered with large amounts of secretory products. The papillae have a thick and ridged cuticle. The cuticle in the rest of the transmitting tract is thin and detached from the cell wall by the secretory products. It is more or less ruptured in the secretory parts of the stigma and ovary. In the stylar canal the major part of the cuticle is continuous and covers the secretory products. The occurence of a large amount of vesicles in the stigma transmitting tissue cells is interpreted as a result of high dictyosome activity. An electron opaque material is produced in the dictyosomes and appears in vesicles and vacuoles but also between the plasma membrane and the cell walls in the stigma. A small amount of such material is present in the cell walls. Corresponding material is also present in the style and the ovary but declines basipetally. Plastids with strongly electron opaque plastoglobules are present at all levels in the transmitting tract.

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“…Among species with open styles Strelitzia has a growth rate of about 2 m d h o u r in the style and stigma (Kronestedt et al 1986) and Hemerocallis 3 m d h o u r in the style (Sanders & Lord 1989). In Actinidia the growth rate is much lower; in the stigma and style 0.2 mm/hour in A. chinensis and 0.3 m d h o u r in A. deliciosa (Harvey et a1.1987).…”

Section: Discussionmentioning

confidence: 99%

The transmitting tract in Trimezia fosteriana (Iridaceae). III. Pollen tube growth in the stigma, style and ovary

Bystedt

Vennigerholz

1991

Nordic Journal of Botany

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Trimezia fosteriana is a self‐incompatible plant with an open style. The stigma was found to be receptive for approx. three hours. Pollen tube growth in the entire transmitting tract was followed with LM, SEM and TEM. The cuticle that covers the mature papillae is continuous but in the rest of the transmitting tissue it is thin and ruptured. The pollen tubes grow in a mucilage mixed with cuticle remnants. In the style, however, larger parts of a cuticle film remains which gives the impression that pollen tube growth occurs under a cuticle. The secretion contains proteins and carbohydrates including pectic substances. The pollen tube growth rates were estimated to 2 mm/hour in the stigma, 1–2 mm/hour in the style and 0.5 mm/hour in the ovary.

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Structural studies of pollen tube growth in the pistil ofStrelitzia reginae

Cited by 13 publications

References 16 publications

Microtubule organization in the differentiating transfer cells of the placenta inLilium spp.

Microtubule organization in the differentiating transfer cells of the placenta inLilium spp.

The transmitting tract in Trimezia fosteriana (Iridaceae). 1. Ultrastructure in the stigma, style and ovary

The transmitting tract in Trimezia fosteriana (Iridaceae). III. Pollen tube growth in the stigma, style and ovary

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