G
George J. Wullems
Researcher at Radboud University Nijmegen
Publications - 74
Citations - 1694
George J. Wullems is an academic researcher from Radboud University Nijmegen. The author has contributed to research in topics: Pollen & Nicotiana tabacum. The author has an hindex of 27, co-authored 74 publications receiving 1654 citations.
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Journal ArticleDOI
Characterization of a pollen-specific cDNA clone from Nicotiana tabacum expressed during microgametogenesis and germination
Koen Weterings,W. H. Reijnen,van Aarssen R,A.J. Kortstee,Spijkers J,van Herpen M,J.A.M. Schrauwen,George J. Wullems +7 more
TL;DR: This report describes the isolation and characterization of a cDNA clone representing a gene specifically expressed in pollen, NTPc303, which has an open reading frame coding for a predicted protein of 62 kDa and shares homology to ascorbate oxidase and other members of the blue copper oxidase family.
Journal ArticleDOI
Functional Dissection of the Promoter of the Pollen-Specific Gene Ntp303 Reveals a Novel Pollen-Specific, and Conserved Cis-Regulatory Element
TL;DR: Analysis of precisely targeted mutations showed that the NTP303 promoter is not regulated by any of the previously described pollen-specific cis-regulatory elements, however, two adjacent regions from -103 to -86 bp and from -86 to -59 bp were shown to contain sequences which positively regulated the N TP303 promoter.
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Stage-related expression of mRNAs during pollen development in lily and tobacco.
J.A.M. Schrauwen,P. F. M. de Groot,M.M.A. van Herpen,T. van der Lee,W. H. Reynen,Koen Weterings,George J. Wullems +6 more
TL;DR: Homogeneous populations of developing microspores and pollen from anthers of lily and tobacco and tobacco show a continuous production of biomass, reaching a maximum in young pollen, indicating that those mRNAs and proteins play a role in the regulation of pollen development.
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In vitro flower bud formation in tobacco: interaction of hormones.
TL;DR: Results indicate that the interaction of auxin and cytokinin with respect to in vitro flower bud formation is indirect, i.e. does not take place at the level of hormone uptake or metabolism but at some step in the cascade of processes they initiate.
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Thiophene accumulation in relation to morphology in roots of Tagetes patula : Effects of auxin and transformation by Agrobacterium.
TL;DR: The results indicate that auxin directly or indirectly plays a role in the regulation of the thiophene level in root tips.