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Characterization of the pollen growth transition in self-incompatible Petunia inflata

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Abstract

In Petunia inflata, as in other species that shed bicellular pollen, early pollen tube growth in the pistil is slow, then increases 2- to 5-fold depending on the genotype of the female parent. We refer to the time point at which pollen tubes enter the accelerated phase of growth as the pollen growth transition (PGT). Here, we present evidence that pre-PGT and post-PGT growth are quantitatively and qualitatively different, and that the PGT is triggered when pollen tubes reach the transition zone (TZ) below the stigma. The capacity of various pistil zones to precipitate the PGT was tested through 'stump' pollinations: varying lengths of the pistil apex were excised, the cut surface of the remaining pistil (the stump) coated with stigmatic exudates then dusted with compatible pollen. Pollen applied to TZ tissues entered the PGT earlier than pollen growing in intact control pistils; the PGT was delayed in stylar stumps, largely because of delayed germination and reduced pre-PGT growth. In immature pistils, the PGT was delayed by several hours relative to its onset in mature pistils. The PGT fails to occur in pollen cultured in vitro. Collectively, the data suggest that pollen tubes become competent to enter the PGT when they reach a critical size, but the physicochemical environment of the transmitting tissue is necessary for triggering the cellular changes that result in accelerated growth. An analysis of the distribution of pollen tube tips before and after the PGT suggests that pollen competition is most intense during the pre-PGT phase.

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Acknowledgements

We thank undergraduate students Justin Foster, Irene Kloth, and Mandi Vaughn for enthusiastic participation in various aspects of the project. This work was supported by intramural grants from the Bureau of Faculty Research, Western Washington University.

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Authors and Affiliations

  1. Biology Department, MS9160, Western Washington University, Bellingham, WA 98225, USA

    Nathan Lubliner & Anu Singh-Cundy

  2. Department of Environmental Studies, Western Washington University, Bellingham, WA 98225, USA

    Donald T. Singh-Cundy

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  1. Nathan Lubliner
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  2. Donald T. Singh-Cundy
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  3. Anu Singh-Cundy
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Correspondence to Anu Singh-Cundy.

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Lubliner, N., Singh-Cundy, D.T. & Singh-Cundy, A. Characterization of the pollen growth transition in self-incompatible Petunia inflata . Sex Plant Reprod 15, 243–253 (2003). https://doi.org/10.1007/s00497-002-0162-4

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  • DOI: https://doi.org/10.1007/s00497-002-0162-4

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