Overgrowth of Pollen Tubes in Embryo Sacs of Rhododendron Following Interspecific Pollinations

Williams, E. G.; Kaul, V.; Rouse, JL; Palser, BF

doi:10.1071/bt9860413

Cited by 48 publications

(30 citation statements)

References 6 publications

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“…In two Arabidopsis female gametophyte mutants, feronia (Huck et al, 2003) and sirene (Rotman et al, 2003), wild-type pollen tubes enter mutant female gametophytes but fail to cease growth, rupture, and release their contents. Similar pollen tube overgrowths occur in interspecific crosses of Rhododendron (Williams et al, 1986) and in the in vitro Torenia system (Higashiyama et al, 1998). These observations suggest that the female gametophyte contains factors that control the arrest of pollen tube growth and/or the release of pollen tube contents.…”

Section: Introductionsupporting

confidence: 53%

MYB98Is Required for Pollen Tube Guidance and Synergid Cell Differentiation inArabidopsis

et al. 2005

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The synergid cells of the female gametophyte play a role in many steps of the angiosperm fertilization process, including guidance of pollen tube growth to the female gametophyte. However, the mechanisms by which the synergid cells become specified and develop their unique features during female gametophyte development are not understood. We identified MYB98 in a screen for Arabidopsis thaliana genes expressed in the female gametophyte. MYB98 is a member of the R2R3-MYB gene family, the members of which likely encode transcription factors. In the context of the ovule, MYB98 is expressed exclusively in the synergid cells, and mutations in this gene affect the female gametophyte specifically. myb98 female gametophytes are affected in two unique features of the synergid cell, pollen tube guidance and the filiform apparatus, but are otherwise normal. MYB98 also is expressed in trichomes and endosperm. Homozygous myb98 mutants exhibit no sporophytic defects, including trichome and endosperm defects. Together, these data suggest that MYB98 controls the development of specific features within the synergid cell during female gametophyte development.

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Section: Introductionsupporting

confidence: 53%

MYB98Is Required for Pollen Tube Guidance and Synergid Cell Differentiation inArabidopsis

et al. 2005

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“…However, after the pollen tube has entered the embryo sac, the tip of the pollen tube appears to either proliferate or grow the length of the central cell and abort, failing to discharge and deposit its sperm cells into the synergid (Figure 3) (Huck et al, 2003;Rotman et al, 2003). Similar overgrowth of the pollen tube within the embryo sac is observed after incongruous interspecific crosses in Rhododendron (Williams et al, 1986). Together, these data suggest that the arrest of pollen tube growth and rupture are controlled directly or indirectly by a compound from the synergid.…”

Section: Female Control Of Fertilizationmentioning

confidence: 56%

Experimental Analysis of the Fertilization Process

Weterings

Russell

2004

THE PLANT CELL ONLINE

164

130

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“…Nevertheless, to date attempts to break the unilateral barrier to hybridisation between E. globulus and E. nitens by artificially shortening the E. globulus styles have not been successful with neither the E. globulus control nor the E. nitens pollinations setting seed (Badcock and Volker, unpublished data). Reduced cross success was also reported in Rhododendron when some large-flowered species were used to pollinated small-flowered species, possibly due to mis-matched timing of male and female maturity (Williams and Rouse 1988) or overgrowth of pollen tubes (Williams et al 1986). Such an effect has not as yet been reported in Eucalyptus where small-flowered species have been successfully pollinated by quite large-flowered species (e.g.…”

Section: Discussionmentioning

confidence: 86%

Unilateral Cross-Incompatibility in Eucalyptus: the Case of Hybridisation Between E. globulus and E. nitens

Gore¹,

Potts²,

Volker³

et al. 1990

Aust. J. Bot.

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The growth of E. globulus and E. nitens pollen tubes in styles of E. globulus was examined in order to elucidate the site of the unilateral barrier to hybridisation. Pollen tubes of E. nitens failed to grow the full length of the larger E. globulus style. E. globulus pollen tubes grew an average of 1.4 mm per day for the first 4 days, compared with 0.8 mm per day for pollen tubes of E. nitens. From days 4 to 14, the growth of E. nitens pollen tubes slowed to an average of 0.2 mm per day and virtually no growth occurred after day 14. In contrast, E. globulus pollen tubes grew through the style and into the ovary between days 5 and 14. By day 28, at about the time of style abscission, E. nitens tubes had grown only 6 mm, well short of the full length of the E. globulus style (9-10 mm). A similar difference in growth was obtained in vitro where E. nitens pollen tubes were significantly shorter than those of E. globulus. A comparison also including E. ovata, E. urnigera and E. gunnii indicated a significant correlation between style length and in vitro pollen tube length. It is argued that the unilateral cross-incompatibility between E. globulus and E. nitens is due to a structural barrier arising from an inherent limit to pollen tube growth which is associated with pistil size.

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Overgrowth of Pollen Tubes in Embryo Sacs of Rhododendron Following Interspecific Pollinations

Cited by 48 publications

References 6 publications

MYB98Is Required for Pollen Tube Guidance and Synergid Cell Differentiation inArabidopsis

MYB98Is Required for Pollen Tube Guidance and Synergid Cell Differentiation inArabidopsis

Experimental Analysis of the Fertilization Process

Unilateral Cross-Incompatibility in Eucalyptus: the Case of Hybridisation Between E. globulus and E. nitens

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