Effects of Previous Pollination and Stylar Ethylene on Pollen Tube Growth in <i>Petunia hybrida</i> Styles

Hoekstra, Folkert A.; Roekel, G.C. van

doi:10.1104/pp.86.1.4

Cited by 15 publications

(5 citation statements)

References 14 publications

(16 reference statements)

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“…Thus, these data suggested that pollen-borne ACC was the substrate for initial pollination-induced ethylene production in Petunia (137). Other reports have suggested that the quantity of pollen-borne ACC would be vastly insufficient to support the amount of ethylene produced in the stigma following pollination (139), and two reports indicate that diffusion of ACC from the pollen is likely to be restricted under conditions that prevail in vivo, which would further restrict its availability to support ethylene production in the stigma (60,121). Although the conflicting data indicate that pollen-borne ACC cannot account for the initial pollination-induced ethylene production in the stigma of all flowers, it is possible that exogenous pollen-borne ACC may be responsible for initiating ethylene production in the stigma of at least some flowers, and this early ethylene production may be subsequently enhanced by autocatalytic production of ACC in the stigma.…”

Section: Primary Pollination Signalsmentioning

confidence: 88%

“…The primary pollination signal has been proposed to result from physical contact between the pollen and stigma, from pollen tube penetration of the stigma (40,41), or from pollen-borne chemical messengers (60,137,159). In Petunia, carnation, and orchid flowers, the initial response to pollination is rapid ethylene evolution by the stigma.…”

Section: Primary Pollination Signalsmentioning

confidence: 99%

“…In spite of its presence in relatively large quantities in some pollen (127,137,158), the role of ACC in supporting the initial ethylene production in the stigma has been controversial. For example, Hoekstra & van Roekel (60) reported that ACC content of pollen from various sources is not well correlated with the level of pollination-induced ethylene production, and several reports indicated that treatment of the stigma with an inhibitor of ACC synthase, aminoethoxyvinylglycine (AVG), before pollination prevented pollination-induced ethylene production (61,117,169,176). Thus, these reports suggested that pollination-induced ethylene production is derived from endogenous production of ACC rather than from exogenous pollen-borne ACC.…”

Section: Primary Pollination Signalsmentioning

confidence: 99%

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Pollination Regulation of Flower Development

O’Neill

1997

Annu. Rev. Plant. Physiol. Plant. Mol. Biol.

210

137

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Pollination regulates a syndrome of developmental responses that contributes to successful sexual reproduction in higher plants. Pollination-regulated developmental events collectively prepare the flower for fertilization and embryogenesis while bringing about the loss of floral organs that have completed their function in pollen dispersal and reception. Components of this process include changes in flower pigmentation, senescence and abscission of floral organs, growth and development of the ovary, and, in certain cases, pollination also triggers ovule and female gametophyte development in anticipation of fertilization. Pollination-regulated development is initiated by the primary pollination event at the stigma surface, but because developmental processes occur in distal floral organs, the activity of interorgan signals that amplify and transmit the primary pollination signal to floral organs is implicated. Interorgan signaling and signal amplification involves the regulation of ethylene biosynthetic gene expression and interorgan transport of hormones and their precursors. The coordination of pollination- regulated flower development including gametophyte, embryo, and ovary development; pollination signaling; the molecular regulation of ethylene biosynthesis; and interorgan communication are presented.

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Section: Primary Pollination Signalsmentioning

confidence: 88%

Section: Primary Pollination Signalsmentioning

confidence: 99%

Section: Primary Pollination Signalsmentioning

confidence: 99%

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Pollination Regulation of Flower Development

O’Neill

1997

Annu. Rev. Plant. Physiol. Plant. Mol. Biol.

210

137

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“…In studies of peach and pear pollen, Search and Stanley (1968) and Buchanan and Biggs (1969) reported that both in vitro pollen germination and/or tube growth were stimulated by exogenous ethylene. Other studies do not support a role for ethylene in growth of pollen tubes in petunia styles (Sfakiotakis et al, 1972;Hoekstra and Van Roekel, 1988).…”

Section: Introductionmentioning

confidence: 95%

Ovary and Gametophyte Development Are Coordinately Regulated by Auxin and Ethylene following Pollination.

1993

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The differentiation and development of ovules in orchid flowers are pollination dependent. To define the developmental signals and timing of critical events associated with ovule differentiation, we have examined factors that regulate the initial events in megasporogenesis and female gametophyte development and characterized its progression toward maturity and fertilization. Two days after pollination, ovary wall epidermal cells begin to elongate and form hair cells; this is the earliest visible morphological change, and it occurs at least 3 days prior to pollen germination, indicating that signals associated with pollination itself trigger these early events. The effects of inhibitors of ethylene biosynthesis on early morphological changes indicated that ethylene, in the presence of auxin, is required to initiate ovary development and, indirectly, subsequent ovule differentiation. Surprisingly, pollen germination and growth were also strongly inhibited by inhibitors of ethylene biosynthesis, indicating that male gametophyte development is also regulated by ethylene. Detailed characterization of the development of both the female and male gametophyte in pollinated orchid flowers indicated that pollen tubes entered the ovary and grew along the ovary wall for 10 to 35 days, at which time growth was arrested. Approximately 40 days after pollination, coincident with ovule differentiation as indicated by the presence of a single archesporial cell, the direction of pollen tube growth became redirected toward the ovule, suggesting a chemical signaling between the developing ovule and male gametophyte. Taken together, these results indicate that both auxin and ethylene contribute to the regulation of both ovary and ovule development and to the coordination of development of male and female gametophytes.

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“…To measure pollen tube growth, styles were immersed for 1 d in a 10 N KOH solution. Thereafter, styles were washed with water, stained with decolourized anilin blue and examined by UV microscopy (Hoekstra and Van Roekel, 1988).…”

Section: Pollen Tube Growthmentioning

confidence: 99%

Pollination and stigma wounding: same response, different signal?

Woltering¹,

Vrije²,

Harren

et al. 1997

J Exp Bot

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In Petunia hybrida flowers, both pollination and stigma wounding induced a transient increase in ethylene pro duction and hastened corolla senescence. Ethylene production by different flower parts was measured in situ using laser photoacoustic (LPA) spectroscopy. In pollinated flowers, ethylene was exclusively produced by the stigma/style region whereas wounding of the stigma induced ethylene production both by the stigma/style region and by the remaining flower parts. In aminoethoxyvinylglycine (AVG)-treated flowers, sub sequent treatment of the unwounded stigma with 1«aminocyclopropane-1-carboxylic acid (ACC) induced ethylene production exclusively by the stigma/style region whereas treatment of a previously wounded stigma with ACC induced a simultaneous increase in ethylene production by the stigma/style region and the remaining flower parts. These results suggest that following stigma wounding, either ACC or ethylene is involved in inter-organ communication. Following pol lination, the signal is apparently not directly related to ethylene.In vivo ACC oxidase activity of most flower parts, including the gynoecium, was higher in light than in dark. Light or dark did not influence the relative contri butions of stigma/style and remaining flower parts to the total pollination, wounding or ACC-induced ethy lene production, indicating that ACC is not transloc ated. Both in excised styles and intact flowers, radiolabelled ACC and its analogue a-amino/sobutyric acid (AIB), applied either to an intact or wounded stigma, were largely immobile confirming that ACC is not likely to play a role in inter-organ signalling.The results collectively suggest that following stigma wounding, translocation of ethylene may be the signal responsible for initiation of corolla senescence; following pollination the signal is not directly related to ethylene.

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Effects of Previous Pollination and Stylar Ethylene on Pollen Tube Growth in Petunia hybrida Styles

Cited by 15 publications

References 14 publications

Pollination Regulation of Flower Development

Pollination Regulation of Flower Development

Ovary and Gametophyte Development Are Coordinately Regulated by Auxin and Ethylene following Pollination.

Pollination and stigma wounding: same response, different signal?

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