The Significance of the Obturator in the Control of Pollen Tube Entry into the Ovary in Peach (Prunus persica)

Arbeloa, A.; Herrero, M.

doi:10.1093/oxfordjournals.aob.a087500

Cited by 61 publications

(49 citation statements)

References 14 publications

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“…Our observations of a funnel-shaped subpapillar area that is basipetally continuous with the stylar transmitting tissue support the hypothesis that the architecture of the stigma and the transmitting tissue limits the number of pollen tubes reaching the ovule (Heslop-Harrison and HeslopHarrison 1985;Matthews et al 1999). In some plant species, a structure called the obturator regulates the timing of pollen tube entry into the ovary through a secretion that stains for carbohydrates and proteins (Tilton and Horner 1980;Arbeloa and Herrero 1987). In pistachio, the pollen tube penetrates the ovule via a protuberance, the ponticulus, which develops in the uppermost area of the funiculus between the style and ovule (Martínez-Pallé and Herrero 1995).…”

Section: Discussionmentioning

confidence: 99%

Morphological, histological and ultrastructural changes in the olive pistil during flowering

et al. 2012

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Section: Discussionmentioning

confidence: 99%

Morphological, histological and ultrastructural changes in the olive pistil during flowering

et al. 2012

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“…Interestingly, starch accumulated in the transmitting tissue is depleted as the pollen tubes travel past, but remains unaltered in unpollinated flowers, suggesting that starch metabolism is also stimulated by the presence of the pollen tube (Herrero & Dickinson 1979). However, in the ovary, secretion at the obturator is not affected by the pollen tubes and occurs at the same developmental timepoint in pollinated and unpollinated flowers (Arbeloa & Herrero 1987).…”

Section: Perspectivesmentioning

confidence: 94%

“…Secretions on the placental surface have been described in several unrelated species (reviewed in Sage et al 1994); however, work on peaches showed that the obturator also produced a secretion that was required for pollen tube extension (Arbeloa & Herrero 1987). Evidence for this came from experiments which showed that, upon arrival at the base of the style, pollen tubes stopped growth for some 5 days and only resumed extension on production of this secretion.…”

Section: Successful Mating Is Preceded By a Synchronous Male-female Rmentioning

confidence: 99%

“…These control points are the obturator, exostome, micropyle and eventually, the nucellar tissue itself. On the placental surface of the peach, alterations in pollen tube growth were first seen associated with the obturator (Arbeloa & Herrero 1987), which strongly suggested that a secretion by this structure was required for the pollen tube to progress. Further, in plants where a delayed penetration of the ovule was recorded (Herrero & Arbeloa 1989), it was later discovered that the delay coincided precisely with the time required for the ovules to produce a secretion at the exostome and micropyle (Herrero 2000).…”

Section: Alterations In Pollen Tube Development and Male-female Asyncmentioning

confidence: 99%

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Male and female synchrony and the regulation of mating in flowering plants

Herrero

2003

Phil. Trans. R. Soc. Lond. B

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Successful mating clearly requires synchronous development of the male and female sexual organs. Evidence is accumulating that this synchrony of development also persists after pollination, with both pollen and pistil following complex, but highly integrated developmental pathways. The timing of the malefemale interaction is crucial for the pistil, which, far from being a mature passive structure, is engaged in a continuing programme of development: only being receptive to the advances of the pollen for a relatively short window of time. This developmental programme is most conspicuous in the ovary, and this review focuses on the interaction between the male and female tissues in this structure. The review first considers pollen tube development in the ovary, concentrating of the mechanisms by which its growth is modulated at various control points associated with structures within the ovary. Second, alterations to this 'normal' developmental programme are reviewed and considered in the context of a breakdown of developmental synchrony. Finally, the consequences of male-female developmental synchrony and asynchrony are explored. Clearly, a synchronous male-female relationship leads to a successful fertilization. However, lack of synchrony also occurs, and could emerge as a powerful tool to investigate the regulation of mating.

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“…An obturator occurs in several unrelated families, including monocots and eudicots, and is a modification of the ovarian transmitting tissue with origin in the placenta and/or in the funicle (Tilton and Horner, 1980). It is believed that the obturator serves as a bridge between the placenta and the ovule micropyle, driving physically and/or chemically the growth of the pollen tube (Arbeloa and Herrero, 1987;Herrero, 2000;Maheshwari, 1950;Tilton and Horner, 1980). The obturator is usually a secretory tissue and varies morphologically and anatomically (Tilton and Horner, 1980).…”

Section: Discussionmentioning

confidence: 99%